Electrode device, water quality measurement device, and water quality measurement method

Abstract

To provide an electrode device capable of preventing a comparison inner electrode from dissolving into a comparison internal liquid.SOLUTION: An electrode device comprising a comparison electrode is provided, the comparison electrode comprising a comparison inner electrode containing a first component, a comparison storage for storing the comparison inner electrode therein, a comparison internal liquid stored inside the comparison storage to immerse the comparison inner electrode therein, and a dissolving agent, containing the first component, disposed inside the comparison internal liquid in a solid state.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] This specification relates to an electrode device, a water quality measurement device, and a water quality measurement method.

Background Art

[0002] Conventionally, for example, an electrode device includes a reference electrode. The reference electrode includes a reference inner electrode, a reference housing portion that houses the reference inner electrode therein, and a reference internal liquid that is housed inside the reference housing portion and immerses the reference inner electrode (for example, Patent Document 1). By the way, when the reference inner electrode contains a component that decomposes when immersed in a liquid, as the temperature of the reference internal liquid rises, the solubility of the component in the reference internal liquid increases, so there is a risk that the reference inner electrode will dissolve into the reference internal liquid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, the problem is to provide an electrode device, a water quality measurement device, and a water quality measurement method capable of suppressing the elution of the reference inner electrode into the reference internal liquid.

Means for Solving the Problems

[0005] An electrode device is an electrode device including a reference electrode, wherein the reference electrode includes a reference inner electrode containing a first component, a reference housing portion that houses the reference inner electrode therein, a reference internal liquid that is housed inside the reference housing portion and immerses the reference inner electrode, and a dissolution material that contains the first component and is disposed as a solid inside the reference internal liquid.

[0006] The water quality measurement device includes the above electrode device.

[0007] The water quality measurement method measures the water quality value of the target liquid using the above electrode device.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] In each drawing, the dimensions of the components may be enlarged or reduced with respect to the actual dimensions for ease of understanding, for example, and the dimensional ratios between the drawings may not match. In addition, in each drawing, a part of the components may be omitted for ease of understanding, for example.

[0010] Terms including ordinal numbers such as first, second, etc. are used to describe various components, but this term is used only for the purpose of distinguishing one component from another, and the components are not particularly limited by this term. Note that the number of components including ordinal numbers is not particularly limited, and may be one, for example. Also, the ordinal numbers used in the following specification and drawings may be different from the ordinal numbers described in the claims.

[0011] Hereinafter, an embodiment of the electrode device and the water quality measuring device will be described with reference to FIGS. 1 to 6. Note that the following embodiment is exemplified to assist in understanding the configuration and the like of the electrode device and the water quality measuring device, and does not limit the configuration of the electrode device and the water quality measuring device.

[0012] As shown in FIG. 1, the water quality measuring device 1 includes an electrode device 10 that detects the water quality of a target liquid X1 that is the measurement target. Further, the water quality measuring device 1 may include, for example, as in this embodiment, a processing device 2 that can communicate with the electrode device 10, and a communication means 3 that can communicate the electrode device 10 and the processing device 2.

[0013] The processing device 2 may include, for example, as in this embodiment, an input unit 2a to which information is input, a processing unit 2b that processes information, and an output unit 2c that outputs information. Although not particularly limited, the processing device 2 may be, for example, a mobile terminal (for example, a smart device, a tablet computer, a notebook personal computer, etc.).

[0014] The communication means 3 may be, for example, a wired communication means (for example, a communication cable, a wired LAN, etc.), or may be, for example, a wireless communication means (for example, Wi-Fi, a wireless LAN, etc.). Note that the electrode device 10 and the processing device 2 may be configured to be separated, for example, may be configured to be separably connected, or may be configured to be integrally formed inseparably, for example.

[0015] The input unit 2a is not particularly limited, but may be, for example, a button, a touch panel, a keyboard, a mouse, or the like. Then, information such as an instruction to start measurement and information on measurement conditions may be input to the input unit 2a.

[0016] The processing unit 2b may include, for example, a processor such as a CPU and an MPU, a memory such as a ROM and a RAM, and various interfaces. Specifically, the processing unit 2b may include, for example, an acquisition unit that acquires information from the electrode device 10 and the input unit 2a, etc., a storage unit that stores information, an arithmetic unit that calculates information (e.g., water quality value), and a control unit that controls each part of the water quality measuring device 1 (e.g., the electrode device 10, the output unit 2c).

[0017] The output unit 2c is not particularly limited. For example, it may be a display unit that displays information (e.g., a monitor, an indicator light), a sound emitting unit that emits information as sound (e.g., a speaker, a buzzer), a signal output unit that outputs a signal to the outside (e.g., a central monitoring panel, etc.). And the output unit 2c may output, for example, the measured information (e.g., water quality value).

[0018] As shown in FIGS. 1 to 3, the electrode device 10 includes a measurement electrode 11 and a reference electrode 21 in order to measure a specific water quality value of the target liquid X1. Thereby, for example, the electrode device 10 detects the potential difference between the measurement electrode 11 and the reference electrode 21, and the processing device 2 calculates the water quality value based on the potential difference, whereby a specific water quality value of the target liquid X1 can be measured. Note that the electrode device 10 including the measurement electrode 11 and the reference electrode 21 is also called a composite electrode, for example.

[0019] The water quality items of the target liquid X1 detected by the electrode device 10 are not particularly limited. For example, they may be pH, oxidation-reduction potential (ORP), specific ions, etc. Note that the specific ions are not particularly limited. For example, they may be ammonium ions, nitrate ions, potassium ions, chloride ions, calcium ions, sodium ions, etc.

[0020] Also, the electrode device 10 may be formed to be long along the first direction D1, for example, as in this embodiment. And, for example, when the first end portion 10a in the first direction D1 of the electrode device 10 is immersed in the target liquid X1, the electrode device 10 may be configured to detect a specific water quality value.

[0021] The electrode device 10 is not particularly limited. For example, it may be held by a measurer or a jig and detect specific water quality values of the target liquid X1 placed in a container. Further, the electrode device 10 may be attached to a body or the like, for example, and detect specific water quality values of the target liquid X1 such as sewage treatment water (for example, aerobic tank water, anaerobic tank water, influent tank water), excrement treatment water, semiconductor factory drainage, chemical product factory drainage, food factory drainage, water intake from rivers and reservoirs, well water and groundwater, aquaculture pond water and drainage, liquid fertilizer in a plant factory and its drainage, etc.

[0022] Further, the electrode device 10 may include a temperature sensor 31 whose end is exposed in order to detect the temperature of the target liquid X1, for example, as in the present embodiment. Note that the electrode device 10 may include other water quality sensors (for example, a dissolved oxygen sensor, a conductivity sensor, a turbidity sensor, etc.) in order to detect other water quality items (for example, dissolved oxygen, conductivity, turbidity, etc.).

[0023] Further, the electrode device 10 may include, for example, as in the present embodiment, a housing 32 extending in a cylindrical shape along the first direction D1, a cover 33 covering the end of the temperature sensor 31, and a terminal 34 electrically connected to the outside. Although not particularly limited, in the present embodiment, the cover 33 is disposed at the first end 10a of the electrode device 10 in the first direction D1, and the terminal 34 is disposed at the second end 10b of the electrode device 10 in the first direction D1.

[0024] The housing 32 and the cover 33 are not particularly limited. For example, they are formed of metal, hard resin, glass, etc., and have rigidity so as not to deform. Further, the cover 33 may include an opening 33a for the target liquid X1 to enter therein, for example, as in the present embodiment. Note that the cover 33 may be connected to the first end 32a of the housing 32 in the first direction D1, for example, as in the present embodiment.

[0025] As shown in FIGS. 2 to 4, the measurement electrode 11 includes a measurement inner electrode 12, a measurement housing portion 13 that houses the measurement inner electrode 12 therein, and a measurement internal liquid 14 that is housed inside the measurement housing portion 13 and immerses the measurement inner electrode 12. Further, the measurement electrode 11 may include, for example, as in the present embodiment, a response film 15 that generates a potential corresponding to the concentration of a specific water quality item (for example, hydrogen ions, specific ions) of the target liquid X1, and a lead wire 16 that electrically connects the terminal 34 (see FIG. 1) and the measurement inner electrode 12 having conductivity.

[0026] The measurement housing portion 13 is not particularly limited. For example, it is formed of metal, hard resin, glass, etc., and has rigidity so as not to deform. And the measurement housing portion 13 may, for example, extend in a cylindrical shape along the first direction D1 as in the present embodiment, and may be arranged across the inside and outside of the housing 32.

[0027] The response film 15 may, for example, as in the present embodiment, be fixed to the first end portion 13a in the first direction D1 of the measurement housing portion 13 and be arranged outside the housing 32 and inside the cover 33. Thus, since the response film 15 is exposed, when the first end portion 10a of the electrode device 10 is immersed in the target liquid X1, the response film 15 comes into contact with the target liquid X1.

[0028] Therefore, in the measurement electrode 11, as the concentration of a specific water quality item (for example, hydrogen ions, specific ions) of the target liquid X1 changes, the potential generated in the response film 15 changes. Thus, in the present embodiment, the water quality item of the target liquid X1 detected by the electrode device 10 is pH or a specific ion. Note that the measurement internal liquid 14 exists between the response film 15 and the measurement inner electrode 12, and the response film 15 electrically insulates the target liquid X1 and the measurement inner electrode 12.

[0029] Further, although not particularly limited, the measurement electrode 11 may include, for example, a protective film that permeates specific ions (e.g., hydrogen ions, specific ions) of the target liquid X1 and covers the response film 15. In such a configuration, the response film 15 is exposed through the protective film and will only come into contact with the substances in the target liquid X1 that have permeated through the protective film.

[0030] Also, the measurement electrode 11 may include, for example, a measurement sealing portion 17 that seals the measurement internal liquid 14 between it and the response film 15 as in this embodiment. Thereby, the measurement internal liquid 14 is sealed in the sealed space formed by the measurement housing portion 13, the response film 15, and the measurement sealing portion 17. Although not particularly limited, the measurement sealing portion 17 may be formed of, for example, an elastic material (e.g., rubber).

[0031] As shown in FIGS. 2 to 5, the reference electrode 21 includes a reference inner electrode 22, a reference housing portion 23 that houses the reference inner electrode 22 inside, a reference internal liquid 24 that is housed inside the reference housing portion 23 and in which the reference inner electrode 22 is immersed, and a liquid junction portion 25 that electrically connects the target liquid X1 and the reference internal liquid 24.

[0032] And in the reference electrode 21, even if the concentration of a specific water quality item (e.g., specific ions) of the target liquid X1 changes, the potential generated at the liquid junction portion 25 is constant and does not change. Also, the reference electrode 21 may include, for example, a lead wire 26 that electrically connects the terminal 34 (see FIG. 1) and the conductive reference inner electrode 22 as in this embodiment.

[0033] The liquid junction portion 25 is not particularly limited, but may be formed of, for example, a porous material (e.g., porous ceramic, etc.). And, for example, a part of the liquid junction portion 25 may be exposed to contact the target liquid X1, and a part of the liquid junction portion 25 may be arranged inside the reference housing portion 23 to contact the reference internal liquid 24.

[0034] Specifically, for example, like in this embodiment, the liquid junction part 25 extends along the first direction D1, and the first end part 25a of the liquid junction part 25 in the first direction D1 is arranged outside and exposed from the comparison housing part 23, and the second end part 25b of the liquid junction part 25 in the first direction D1 is arranged inside the comparison housing part 23. Note that the configuration is not limited to this. For example, the liquid junction part 25 may be formed by a glass lapping structure.

[0035] As shown in FIG. 5, the comparison housing part 23 includes a first housing part 23a where the liquid junction part 25 is arranged, and a second housing part 23b where the comparison inner electrode 22 is arranged inside. Thereby, the comparison internal liquid 24 includes a first internal liquid 24a housed inside the first housing part 23a and a second internal liquid 24b housed inside the second housing part 23b. The first housing part 23a and the second housing part 23b are not particularly limited, but for example, they are formed of metal, hard resin, glass, etc., and have rigidity so as not to deform.

[0036] The first housing part 23a may, for example, extend in a cylindrical shape along the first direction D1 like in this embodiment. Also, the first housing part 23a may, for example, be constituted by the housing 32 like in this embodiment. Note that the configuration is not limited to this. For example, the first housing part 23a may be separate from the housing 32 and arranged inside the housing 32.

[0037] The second housing part 23b extends in a cylindrical shape from the first end part 23c to the second end part 23d. And the second housing part 23b has an opening 23e at the second end part 23d, and the inside of the second housing part 23b communicates with the inside of the first housing part 23a only through the opening 23e. Thereby, the distance that only the comparison internal liquid 24 passes from the liquid junction part 25 to the comparison inner electrode 22 becomes longer than the straight-line distance between the liquid junction part 25 and the comparison inner electrode 22.

[0038] Therefore, for example, it is possible to suppress the target liquid X1 from entering from the liquid junction portion 25 and reaching the vicinity of the comparison internal electrode 22. As a result, for example, the time until potential fluctuations occur due to the target liquid X1 reaching the vicinity of the comparison internal electrode 22 can be extended. Therefore, for example, the continuous use time of the reference electrode 21 can be extended.

[0039] Further, for example, as in the present embodiment, the second accommodating portion 23b linearly extends along the first direction D1 and is disposed inside the first accommodating portion 23a. The linear distance between the second end portion 23d having the opening 23e and the liquid junction portion 25 may be longer than the linear distance between the first end portion 23c and the liquid junction portion 25. Note that the present invention is not limited to such a configuration. For example, the second accommodating portion 23b may include a bent portion. Further, for example, the second accommodating portion 23b may be disposed outside the first accommodating portion 23a.

[0040] Further, the reference electrode 21 may include, for example, as in the present embodiment, reference sealing portions 27, 27 that enclose the reference internal liquid 24 between them. Thereby, the reference internal liquid 24 is enclosed in a sealed space formed by the reference accommodating portion 23 and the reference sealing portions 27, 27. Specifically, in the present embodiment, the reference internal liquid 24 is enclosed in a sealed space formed by the first accommodating portion 23a, the reference sealing portions 27, 27, the measurement accommodating portion 13, and the temperature sensor 31 (see FIGS. 2 and 3). Although not particularly limited, the reference sealing portion 27 may be formed of, for example, an elastic material (for example, rubber).

[0041] Since the first internal liquid 24a is a gel, the second accommodating portion 23b is held by the first internal liquid 24a. Thereby, the position of the second accommodating portion 23b with respect to the first accommodating portion 23a is held by the first internal liquid 24a. Therefore, for example, in order to fix the second accommodating portion 23b to the first accommodating portion 23a, a member connecting the first accommodating portion 23a and the second accommodating portion 23b is not necessary.

[0042] Incidentally, a first component that decomposes and dissolves when immersed in a comparative internal liquid 24 which is a liquid substance (gel or liquid) may be used for the comparative internal electrode 22. Although not particularly limited, for example, when the comparative internal electrode 22 is formed of silver / silver chloride (Ag / AgCl), the silver chloride of the comparative internal electrode 22 is dissolved in the comparative internal liquid 24 by the following decomposition reaction. AgCl→Ag + +Cl -

[0043] Therefore, as shown in FIGS. 5 and 6, the reference electrode 21 includes a dissolution material 28 that contains the first component and is disposed as a solid inside the reference internal liquid 24. Although not particularly limited, in the present embodiment, the reference internal electrode 22 and the dissolution material 28 contain silver chloride (AgCl) which is the first component that dissolves in the reference internal liquid 24.

[0044] Note that the first component contained in the reference internal electrode 22 and the dissolution material 28 may be, for example, silver sulfide (AgS), silver bromide (AgBr), silver iodide (AgI), silver cyanide (AgCN), or may be a combination of a plurality of, for example, silver chloride (AgCl), silver sulfide (AgS), silver bromide (AgBr), silver iodide (AgI), silver cyanide (AgCN).

[0045] Although not particularly limited, for example, the reference internal electrode 22 may be formed of silver / silver chloride / silver sulfide (Ag / AgCl / AgS), and the dissolution material 28 may be formed of silver chloride (AgCl) and silver sulfide (AgS). That is, the first component may be silver chloride (AgCl) and silver sulfide (AgS). Thus, the first component may be, for example, one material, or may be, for example, a plurality of materials.

[0046] In addition, the reference electrode 21 includes a coating material 29 that covers the surface of the reference internal electrode 22. Thereby, while the mass of the first component of the reference internal electrode 22 can be increased, the surface area of the reference internal electrode 22 in contact with the reference internal liquid 24 can be decreased.

[0047] The covering material 29 covers all of the surface of the comparison inner electrode 22 on the side of the second end portion 23d of the second accommodating portion 23b rather than the center in the first direction D1 of the comparison inner electrode 22. And the covering material 29 may cover a part of the surface of the comparison inner electrode 22 on the side of the first end portion 23c of the second accommodating portion 23b rather than the center in the first direction D1 of the comparison inner electrode 22, for example, as in the present embodiment. Thereby, the comparison inner electrode 22 is in contact with the second internal liquid 24b at a part of the surface on the side of the first end portion 23c of the second accommodating portion 23b rather than the center.

[0048] Although not particularly limited, for example, as in the present embodiment, the comparison inner electrode 22 extends along the first direction D1, and the covering material 29 may be configured to be formed in a cylindrical shape extending over the entire length of the comparison inner electrode 22 in the first direction D1. Thereby, the comparison inner electrode 22 is in contact with the second internal liquid 24b only at the first end face 22a in the first direction D1.

[0049] Therefore, even if the comparison inner electrode 22 is dissolved in the second internal liquid 24b, the area of the comparison inner electrode 22 in contact with the second internal liquid 24b is constant (substantially the same). The covering material 29 only needs to be formed of a material that does not react with the comparison internal liquid 24, and is not particularly limited. For example, it may be formed of a resin (for example, Teflon, etc.).

[0050] On the other hand, the dissolving material 28 includes a plurality of granular materials 28a formed in a granular shape. And while the mass of the first component of the comparison inner electrode 22 is larger than the mass of the first component of the dissolving material 28 (specifically, the total mass of the first components of the granular materials 28a), the surface area of the dissolving material 28 in contact with the second internal liquid 24b (specifically, the total surface area of the granular materials 28a in contact with the second internal solution 24b) is larger than the surface area of the comparison inner electrode 22 in contact with the second internal liquid 24b.

[0051] Thus, for example, when the temperature of the comparison internal liquid 24 rises and the solubility of the first component in the comparison internal liquid 24 increases, it is possible to more easily dissolve the dissolving material 28 in the second internal liquid 24b instead of the comparison internal electrode 22. Therefore, since the dissolving material 28 is dissolved in the second internal liquid 24b, it is possible to suppress the elution of the comparison internal electrode 22 into the second internal liquid 24b. Moreover, since the mass of the first component of the comparison internal electrode 22 is large, the life of the comparison internal electrode 22 can be extended.

[0052] Although not particularly limited, the mass percentage of the first component in the granular material 28a may be, for example, 50% or more, preferably, for example, 70% or more, more preferably, for example, 80% or more, and very preferably, for example, 90% or more. Thereby, for example, the amount of the first component in the dissolving material 28 can be sufficiently ensured.

[0053] Also, for example, as in the present embodiment, the surface area of one granular material 28a may be smaller than the surface area of the comparison internal electrode 22 in contact with the second internal liquid 24b. Although not particularly limited, the diameter of the granular material 28a may be, for example, 2.0 mm or less, preferably, for example, 1.0 mm or less, more preferably, for example, 0.5 mm or less, and very preferably, for example, 0.1 mm or less. Thereby, for example, the surface area of the dissolving material 28 in contact with the second internal liquid 24b (the total surface area of the granular material 28a in contact with the second internal solution 24b) can be sufficiently ensured.

[0054] Also, the comparison internal electrode 22 and the dissolving material 28 are each disposed inside the second housing portion 23b. Specifically, the comparison internal electrode 22 and the dissolving material 28 are each disposed closer to the first end portion 23c side than the center of the second housing portion 23b.

[0055] More specifically, the plurality of granular materials 28a of the dissolving material 28 are stored in the first end portion 23c of the second accommodating portion 23b, and the comparative inner electrode 22 is in contact with the plurality of granular materials 28a. Note that the center of the second accommodating portion 23b refers to the central position between the first end portion 23c and the second end portion 23d among the axes extending in a cylindrical shape from the first end portion 23c to the second end portion 23d.

[0056] Thereby, the first component of the dissolved dissolving material 28 stays in the vicinity of the comparative inner electrode 22 inside the second accommodating portion 23b. Therefore, when the dissolved amount of the first component becomes the solubility of the first component with respect to the vicinity of the comparative inner electrode 22 in the second internal liquid 24b, the dissolution of the dissolving material 28 stops until the first component diffuses to other regions. As a result, it is possible to suppress the elution of the comparative inner electrode 22 into the second internal liquid 24b.

[0057] Moreover, the first component of the dissolved dissolving material 28 stays inside the second accommodating portion 23b and at a position far from the second end portion 23d. And since the second accommodating portion 23b communicates with the first accommodating portion 23a only through the opening 23e of the second end portion 23d, the second internal liquid 24b inside the second accommodating portion 23b can flow out to the first accommodating portion 23a only through the opening 23e. Thereby, it is possible to suppress the outflow of the dissolved first component from the second accommodating portion 23b. Therefore, for example, since a saturated state can be maintained, it is possible to suppress further dissolution of the dissolving material 28 in the second internal liquid 24b.

[0058] Also, the second internal liquid 24b is a gel or a liquid-like liquid. For example, it may be a gel as in the present embodiment, or may be a liquid, for example. And the jelly strength of the first internal liquid 24a is larger than the jelly strength of the second internal liquid 24b. Note that the jelly strength is a value measured in accordance with JIS K6503 (2001).

[0059] As a result, since the jelly strength of the first internal liquid 24a is high, it is possible to suppress the first internal liquid 24a from flowing into the second storage portion 23b. Consequently, it is possible to suppress the second internal liquid 24b from flowing out of the second storage portion 23b. Therefore, since it is possible to suppress the first component of the dissolved material 28 from flowing out of the second storage portion 23b, for example, a saturation state can be maintained.

[0060] Moreover, since the jelly strength of the first internal liquid 24a is high, it is possible to suppress the first internal liquid 24a from flowing out to the outside from the liquid junction portion 25. As a result, it is possible to suppress the target liquid X1 from flowing into the first storage portion 23a from the liquid junction portion 25. Thereby, it is possible to suppress the target liquid X1 from being mixed into the comparative internal liquid 24 of the comparative storage portion 23 (specifically, the first internal liquid 24a of the first storage portion 23a). Therefore, for example, it is possible to appropriately measure the water quality value of the target liquid X1.

[0061] Although not particularly limited, for example, the first internal liquid 24a and the second internal liquid 24b may each be a gel containing acrylamide gel, lithium acetate, potassium chloride, and silver chloride dissolved to a saturation state. Also, although not particularly limited, the mass percentage of the acrylamide gel in the first internal liquid 24a may be, for example, 150% to 300% of the mass percentage of the acrylamide gel in the second internal liquid 24b.

[0062] In this way, not only is the dissolved material 28 containing the first component disposed as a solid inside the comparative internal liquid 24, but the first component may also be dissolved in the comparative internal liquid 24. Although not particularly limited, for example, the dissolved amount of the first component may be the solubility of the first component with respect to the second internal liquid 24b at a specific temperature.

[0063] The specific temperature is not particularly limited. For example, the specific temperature may be the temperature of the comparative internal liquid 24 when the electrode device 10 is manufactured. Also, for example, the specific temperature may be the air temperature (e.g., the maximum air temperature, the annual average air temperature, etc.) at the location where the electrode device 10 is used.

[0064] Further, the measurement internal liquid 14 (see FIG. 4) is a gel or liquid state. And the jelly strength of the second internal liquid 24b is larger than that of the measurement internal liquid 14. Thus, due to the large jelly strength of the second internal liquid 24b, it is difficult for the second internal liquid 24b to flow, so that the outflow of the second internal liquid 24b from the second accommodating portion 23b can be suppressed. Therefore, since the outflow of the first component of the dissolved material 28 from the second accommodating portion 23b can be suppressed, for example, a saturated state can be maintained.

[0065] The measurement internal liquid 14 is not particularly limited, but may be, for example, a liquid containing potassium chloride. Also, the measurement internal electrode 12 is not particularly limited, but may be formed of, for example, silver / silver chloride.

[0066] Also, the portions in contact with the comparison internal liquid 24 excluding the comparison internal electrode 22, specifically, in this embodiment, the comparison accommodating portion 23 (the first accommodating portion 23a, the second accommodating portion 23b), the liquid junction portion 25, the lead wire 26, the comparison sealing portion 27, the coating material 29, the measurement accommodating portion 13, and the temperature sensor 31 may be formed of a material that does not react with the comparison internal liquid 24, for example, and may be formed of a non-conductive material, for example. The lead wire 26 may be coated with a non-conductive material, for example, a wire of a conductive material.

[0067] Also, in the electrode device 10, when the temperature of the comparison internal liquid 24 drops and the dissolved material 28 dissolved in the comparison internal liquid 24 exists again as a solid, for example, the dissolved material 28 may float inside the comparison internal liquid 24 at a position away from the position before dissolution.

[0068] From the above, the electrode device 10 is, as in this embodiment, an electrode device 10 provided with a reference electrode 21, wherein the reference electrode 21 includes a reference internal electrode 22 containing a first component, a reference accommodating portion 23 that houses the reference internal electrode 22 therein, The comparative internal liquid 24 that is accommodated inside the comparative accommodation part 23 and immerses the comparative internal electrode 22, a melting material 28 that includes the first component and is disposed in a solid state inside the comparative internal liquid 24, such a configuration is preferable.

[0069] According to such a configuration, when the temperature of the comparative internal liquid 24 rises and the solubility of the first component in the comparative internal liquid 24 increases, since the melting material 28 containing the first component is disposed in a solid state inside the comparative internal liquid 24, the melting material 28 is dissolved in the comparative internal liquid 24. As a result, since the melting of the first component of the comparative internal electrode can be suppressed by the melting of the melting material, it is possible to suppress the elution of the comparative internal electrode 22 into the comparative internal liquid 24.

[0070] Also, in the electrode device 10, as in the present embodiment, the surface area of the melting material 28 in contact with the comparative internal liquid 24 is larger than the surface area of the comparative internal electrode 22 in contact with the comparative internal liquid 24, such a configuration is preferable.

[0071] According to such a configuration, since the surface area of the melting material 28 in contact with the comparative internal liquid 24 is larger than the surface area of the comparative internal electrode 22 in contact with the comparative internal liquid 24, it is possible to make it easier for the melting material 28 to be dissolved in the comparative internal liquid 24 than the comparative internal electrode 22. As a result, it is possible to suppress the elution of the comparative internal electrode 22 into the comparative internal liquid 24.

[0072] Also, in the electrode device 10, as in the present embodiment, the mass of the first component of the comparative internal electrode 22 is larger than the mass of the first component of the melting material 28, the comparative electrode 21 includes a coating material 29 that covers the surface of the comparative internal electrode 22, such a configuration may also be used.

[0073] According to such a configuration, since the coating material 29 covers the surface of the comparison inner electrode 22, the surface area where the dissolving material 28 contacts the comparison internal liquid 24 can be made larger than the surface area where the comparison inner electrode 22 contacts the comparison internal liquid 24. Moreover, since the mass of the first component of the comparison inner electrode 22 is larger than the mass of the first component of the dissolving material 28, the life of the comparison inner electrode 22 can be extended.

[0074] Also, in the electrode device 10, as in this embodiment, the comparison electrode 21 includes a liquid junction portion 25 that electrically connects the target liquid X1 and the comparison internal liquid 24, the comparison housing portion 23, a first housing portion 23a where the liquid junction portion 25 is disposed, and a second housing portion 23b where the comparison inner electrode 22 and the dissolving material 28 are respectively disposed inside, the second housing portion 23b extends in a cylindrical shape from a first end portion 23c to a second end portion 23d, the second housing portion 23b has an opening 23e at the second end portion 23d, and communicates with the first housing portion 23a only through the opening 23e, such a configuration is preferable.

[0075] According to such a configuration, since the comparison inner electrode 22 and the dissolving material 28 are respectively disposed inside the second housing portion 23b, the first component of the dissolved dissolving material 28 stays inside the second housing portion 23b. As a result, the dissolution of the dissolving material 28 stops because the dissolution amount of the first component becomes the solubility of the first component with respect to the internal liquid of the second housing portion 23b (in this embodiment, the second internal liquid) 24b. Therefore, it is possible to suppress the elution of the comparison inner electrode 22 into the internal liquid 24b of the second housing portion 23b.

[0076] Moreover, the second housing portion 23b communicates with the first housing portion 23a only through the opening 23e at the second end portion 23d. As a result, since the second internal liquid 24b inside the second housing portion 23b can flow out to the first housing portion 23a only through the opening 23e, it is possible to suppress the outflow of the first component of the dissolved dissolving material 28 from the second housing portion 23b.

[0077] Also, in the electrode device 10, as in the present embodiment, the comparison inner electrode 22 and the dissolution material 28 are each arranged closer to the first end portion 23c than the center of the second accommodation portion 23b. Such a configuration is preferable.

[0078] According to such a configuration, the first component of the dissolved dissolution material 28 stays in the vicinity of the comparison inner electrode 22 on the first end portion 23c side rather than the center of the second accommodation portion 23b. As a result, the dissolution amount of the first component becomes the solubility of the first component with respect to the vicinity region of the comparison inner electrode 22 in the internal liquid (in the present embodiment, the second internal liquid) 24b of the second accommodation portion 23b, and the dissolution of the dissolution material 28 stops until the first component diffuses to other regions. Therefore, it is possible to suppress the elution of the comparison inner electrode 22 into the internal liquid 24b of the second accommodation portion 23b.

[0079] Moreover, the first component of the dissolved dissolution material 28 stays at a position closer to the first end portion 23c than the center of the second accommodation portion 23b, that is, a position far from the opening 23e of the second end portion 23d of the second accommodation portion 23b. Thereby, it is possible to suppress the outflow of the first component of the dissolved dissolution material 28 from the opening 23e of the second end portion 23d of the second accommodation portion 23b.

[0080] Also, in the electrode device 10, as in the present embodiment, the dissolution material 28 is arranged at the first end portion 23c of the second accommodation portion 23b. The comparison electrode 21 includes a coating material 29 that covers the surface of the comparison inner electrode 22. The coating material 29 covers all of the surface of the comparison inner electrode 22 on the second end portion 23d side of the second accommodation portion 23b rather than the center of the comparison inner electrode 22. Such a configuration is preferable.

[0081] According to such a configuration, since the dissolving material 28 is disposed at the first end portion 23c of the second accommodating portion 23b, the first component of the dissolved dissolving material 28 can be retained at a position far from the opening 23e of the second end portion 23d of the second accommodating portion 23b. Thereby, it is possible to suppress the first component of the dissolved dissolving material 28 from flowing out from the opening 23e of the second end portion 23d of the second accommodating portion 23b.

[0082] And, since the coating material 29 covers all of the surface of the comparative inner electrode 22 on the side of the second end portion 23d of the second accommodating portion 23b rather than the center of the comparative inner electrode 22, the comparative inner electrode 22 is on the side of the first end portion 23c of the second accommodating portion 23b rather than the center and comes into contact with the internal liquid (in this embodiment, the second internal liquid) 24b of the second accommodating portion 23b. Thereby, the first component of the dissolved dissolving material 28 stays in the vicinity of the region of the comparative inner electrode 22 that comes into contact with the internal liquid 24b of the second accommodating portion 23d.

[0083] Therefore, when the dissolved amount of the first component becomes the solubility of the first component with respect to the vicinity region of the comparative inner electrode 22 in the internal liquid 24b of the second accommodating portion 23b, the dissolution of the dissolving material 28 stops until the first component diffuses to other regions. As a result, it is possible to suppress the comparative inner electrode 22 from eluting into the internal liquid 24b of the second accommodating portion 23b.

[0084] Also, in the electrode device 10, as in this embodiment, a configuration in which a part of the surface of the comparative inner electrode is in contact with a part of the surface of the dissolving material is preferable.

[0085] According to such a configuration, since a part of the surface of the comparative inner electrode 22 is in contact with a part of the surface of the dissolving material 28, the first component of the dissolved dissolving material 28 stays in the vicinity of the comparative inner electrode 22. Thereby, when the dissolved amount of the first component becomes the solubility of the first component with respect to the vicinity region of the comparative inner electrode 22 in the internal liquid 24b of the second accommodating portion 23b, the dissolution of the dissolving material 28 stops until the first component diffuses to other regions. Therefore, it is possible to suppress the comparative inner electrode 22 from eluting into the internal liquid 24b of the second accommodating portion 23b.

[0086] Also, in the electrode device 10, as in the present embodiment, the dissolution material 28 includes a plurality of granular materials 28a containing the first component, the plurality of granular materials 28a are stored in the first end portion 23c of the second storage portion 23b, such a configuration is preferable.

[0087] According to such a configuration, since the dissolution material 28 includes a plurality of granular materials 28a containing the first component, the second internal liquid 24b can easily contact the entire granular material 28a. Thereby, the dissolution material 28 can be easily dissolved in the internal liquid (the second internal liquid in the present embodiment) 24b. Therefore, elution of the comparative inner electrode 22 into the comparative internal liquid 24 can be suppressed.

[0088] Also, in the electrode device 10, as in the present embodiment, the comparative internal liquid 24 includes a first internal liquid 24a stored inside the first storage portion 23a and a second internal liquid 24b stored inside the second storage portion 23b, and the jelly strength of the first internal liquid 24a is greater than that of the second internal liquid 24b, such a configuration is preferable.

[0089] According to such a configuration, since the jelly strength of the first internal liquid 24a is greater than that of the second internal liquid 24b, the inflow of the first internal liquid 24a into the second storage portion 23b can be suppressed. As a result, the outflow of the second internal liquid 24b from the second storage portion 23b can be suppressed. Thereby, the outflow of the first component of the dissolved dissolution material 28 from the second storage portion 23b can be suppressed.

[0090] Moreover, since the jelly strength of the first internal liquid 24a is greater than that of the second internal liquid 24b, it is possible to suppress the outflow of the first internal liquid 24a from the liquid junction portion 25 to the outside. As a result, it is possible to suppress the inflow of the target liquid X1 from the liquid junction portion 25 into the first storage portion 23a. Thereby, it is possible to suppress the mixing of the target liquid X1 into the comparative internal liquid 24 of the comparative storage portion 23.

[0091] Also, in the electrode device 10, as in the present embodiment, the comparative internal liquid 24 is the first internal liquid 24a stored inside the first storage portion 23a, and the second internal liquid 24b stored inside the second storage portion 23b, and includes the first internal liquid 24a is a gel, the second storage portion 23b is held in a position relative to the first storage portion 23a by the first internal liquid 24a, such a configuration is preferable.

[0092] According to such a configuration, since the first internal liquid 24a is a gel, the second storage portion 23b is held by the first internal liquid 24a. Thereby, the position of the second storage portion 23b relative to the first storage portion 23a is held.

[0093] Also, the electrode device 10, as in the present embodiment, includes a measurement electrode 11 for measuring the water quality value of the target liquid X1 based on the potential difference with the comparative electrode 21, such a configuration is preferable.

[0094] According to such a configuration, since the comparative electrode 21 and the measurement electrode 11 are provided, the electrode device 10 is a composite electrode. Thereby, based on the potential difference between the comparative electrode 21 and the measurement electrode 11, the water quality value of the target liquid X1 can be measured.

[0095] Also, the electrode device 10, as in the present embodiment, includes a measurement electrode 11 for measuring the target liquid X1 based on the potential difference with the comparative electrode 21, The measurement electrode 11 comprises a measurement inner electrode 12 a measurement housing portion 13 that houses the measurement inner electrode 12 therein and a measurement internal liquid 14 that is housed inside the measurement housing portion 13 and immerses the measurement inner electrode 12, and it is preferable that the jelly strength of the second internal liquid 24b is greater than that of the measurement internal liquid 14. Such a configuration is preferable.

[0096] According to such a configuration, since the jelly strength of the second internal liquid 24b is greater than that of the measurement internal liquid 14, the second internal liquid 24b is difficult to flow, so that it is possible to suppress the second internal liquid 24b from flowing out of the second housing portion 23b. Thereby, it is possible to suppress the first component of the dissolved material 28 from flowing out of the second housing portion 23b.

[0097] Further, it is preferable that the water quality measurement device 1 has the electrode device 10 as in the present embodiment. Such a configuration is preferable. According to such a configuration, it is possible to suppress the comparative inner electrode 22 from eluting into the comparative internal liquid 24.

[0098]

[0099] Further, it is preferable that the water quality measurement method measures the water quality value of the target liquid X1 using the electrode device 10 as in the present embodiment. Such a method is preferable. According to such a method, it is possible to suppress the comparative inner electrode 22 from eluting into the comparative internal liquid 24.

[0100]

[0101] ​​Note that the water quality inspection device 1, the electrode device 10, and the water quality measurement method are not limited to the configurations of the above-described embodiments, nor are they limited to the above-described functions and effects. Further, the water quality inspection device 1, the electrode device 10, and the water quality measurement method can of course be variously modified without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations and methods according to the following various modification examples and adopt them in the configurations and methods according to the above-described embodiments.

[0102] (A) In the electrode device 10 according to the above-described embodiment, the surface area of the dissolution material 28 in contact with the comparison internal liquid 24 is larger than the surface area of the comparison internal electrode 22 in contact with the comparison internal liquid 24. However, the electrode device 10 is not limited to such a configuration.

[0103] For example, the surface area of the dissolution material 28 in contact with the comparison internal liquid 24 may be smaller than the surface area of the comparison internal electrode 22 in contact with the comparison internal liquid 24. Further, for example, the surface area of the dissolution material 28 in contact with the comparison internal liquid 24 may be the same as the surface area of the comparison internal electrode 22 in contact with the comparison internal liquid 24.

[0104] (B) Further, in the electrode device 10 according to the above-described embodiment, the mass of the first component of the comparison internal electrode 22 is larger than the mass of the first component of the dissolution material 28. However, the electrode device 10 is not limited to such a configuration.

[0105] For example, the mass of the first component of the comparison internal electrode 22 may be smaller than the mass of the first component of the dissolution material 28. Further, for example, the mass of the first component of the comparison internal electrode 22 may be the same as the mass of the first component of the dissolution material 28.

[0106] (C) Also, in the electrode device 10 according to the above embodiment, the reference electrode 21 includes a coating material 29 that covers the surface of the reference inner electrode 22. However, the electrode device 10 is not limited to such a configuration. For example, the reference electrode 21 may not include the coating material 29, and the surface area of the reference electrode 21 that contacts the reference internal liquid 24 may be the same as the surface area of the reference electrode 21.

[0107] (D) Also, in the electrode device 10 according to the above embodiment, the coating material 29 covers the entire surface of the surface of the reference inner electrode 22 on the second end portion 23d side of the second accommodating portion 23b rather than the center of the reference inner electrode 22. Specifically, the reference inner electrode 22 is in contact with the reference internal liquid 24 at a part of the surface on the first end portion 23c side of the second accommodating portion 23b rather than the center. However, the electrode device 10 is not limited to such a configuration.

[0108] For example, the coating material 29 may cover a part of the surface of the reference inner electrode 22 on the second end portion 23d side of the second accommodating portion 23b rather than the center of the reference inner electrode 22. And, for example, the reference inner electrode 22 may be in contact with the reference internal liquid 24 at a part of the surface on the second end portion 23d side of the second accommodating portion 23b rather than the center.

[0109] Also, for example, the coating material 29 may not cover the entire surface of the surface of the reference inner electrode 22 on the second end portion 23d side of the second accommodating portion 23b rather than the center of the reference inner electrode 22, but may cover at least a part of the surface on the first end portion 23c side of the second accommodating portion 23b rather than the center. And, for example, the reference inner electrode 22 may be in contact with the reference internal liquid 24 at the entire surface on the second end portion 23d side of the second accommodating portion 23b rather than the center.

[0110] Further, for example, the coating material 29 may be configured not to cover the entire surface of the inner comparison electrode 22 on the side of the first end portion 23c of the second accommodation portion 23b from the center of the inner comparison electrode 22, but to cover at least a part of the surface of the inner comparison electrode 22 on the side of the second end portion 23d of the second accommodation portion 23b from the center. And, for example, the inner comparison electrode 22 may be configured to be in contact with the inner comparison liquid 24 over the entire surface on the side of the first end portion 23c of the second accommodation portion 23b from the center.

[0111] (E) Also, in the electrode device 10 according to the above embodiment, the comparison accommodation portion 23 is configured to include a first accommodation portion 23a and a second accommodation portion 23b partitioned inside. However, the electrode device 10 is not limited to such a configuration. For example, the comparison accommodation portion 23 may be configured not to be partitioned inside.

[0112] (F) Also, in the electrode device 10 according to the above embodiment, the first internal liquid 24a is a gel, and the second accommodation portion 23b is configured to have its position with respect to the first accommodation portion 23a held by the first internal liquid 24a. However, the electrode device 10 is not limited to such a configuration.

[0113] For example, the first internal liquid 24a may be a liquid. Also, for example, the comparison electrode 21 may be configured to include a member connecting the first accommodation portion 23a and the second accommodation portion 23b in order to fix the second accommodation portion 23b to the first accommodation portion 23a.

[0114] (G) Also, in the electrode device 10 according to the above embodiment, the jelly strength of the first internal liquid 24a is greater than the jelly strength of the second internal liquid 24b. However, the electrode device 10 is not limited to such a configuration.

[0115] For example, the jelly strength of the first internal liquid 24a may be configured to be the same as that of the second internal liquid 24b. In such a configuration, for example, the first internal liquid 24a and the second internal liquid 24b may be configured to be a common internal liquid (an internal liquid with the same components and the same concentration). Further, for example, the jelly strength of the first internal liquid 24a may be configured to be smaller than that of the second internal liquid 24b.

[0116] (H) Further, in the electrode device 10 according to the above embodiment, the jelly strength of the second internal liquid 24b is configured to be greater than that of the measurement internal liquid 14. However, the electrode device 10 is not limited to such a configuration.

[0117] For example, the jelly strength of the second internal liquid 24b may be configured to be smaller than that of the measurement internal liquid 14. Further, for example, the jelly strength of the second internal liquid 24b may be configured to be the same as that of the measurement internal liquid 14.

[0118] (I) Further, in the electrode device 10 according to the above embodiment, the comparative internal electrode 22 and the dissolving material 28 are each configured to be disposed closer to the first end portion 23c side than the center of the second accommodating portion 23b. However, the electrode device 10 is not limited to such a configuration.

[0119] For example, at least one of the comparative internal electrode 22 and the dissolving material 28 may be configured to be disposed closer to the second end portion 23d side than the center of the second accommodating portion 23b. Further, for example, at least one of the comparative internal electrode 22 and the dissolving material 28 may be configured to be disposed inside the first accommodating portion 23a.

[0120] (J) Further, in the electrode device 10 according to the above embodiment, a part of the surface of the comparative internal electrode 22 is in contact with a part of the surface of the dissolving material 28. Specifically, a part of the first end face 22a of the comparative internal electrode 22 is in contact with a part of the plurality of granular materials 28a. However, the electrode device 10 is not limited to such a configuration. For example, the surface of the comparative internal electrode 22 may be configured to be separated from the dissolving material 28 (all of the granular materials 28a).

[0121] (K) Further, in the electrode device 10 according to the above embodiment, the dissolving material 28 has a configuration including a plurality of granular materials 28a containing the first component. However, the electrode device 10 is not limited to such a configuration.

[0122] For example, the dissolving material 28 may have a configuration consisting of one entity containing the first component. And in such a configuration, although not particularly limited, for example, the surface area of the dissolving material 28 in contact with the comparative internal liquid 24 may be larger than the surface area of the comparative internal electrode 22 in contact with the comparative internal liquid 24. Also, in such a configuration, although not particularly limited, for example, the mass of the first component of the comparative internal electrode 22 may be larger than the mass of the first component of the dissolving material 28.

[0123] (L) Further, in the electrode device 10 according to the above embodiment, the dissolving material 28 is disposed at the first end portion 23c of the second accommodating portion 23b. Specifically, the plurality of granular materials 28a are stored at the first end portion 23c of the second accommodating portion 23b. However, the electrode device 10 is not limited to such a configuration.

[0124] For example, the dissolving material 28 may have a configuration disposed at a position away from the first end portion 23c of the second accommodating portion 23b. Also, for example, the plurality of granular materials 28a may have a configuration stored at a position away from the first end portion 23c of the second accommodating portion 23b.

[0125] (M) Further, the electrode device 10 according to the above embodiment has a configuration including a measurement electrode 11 for measuring the water quality value of the target liquid X1 based on the potential difference with the reference electrode 21. However, the electrode device 10 is not limited to such a configuration. For example, the electrode device 10 may have a configuration including only the reference electrode 21 and not including the measurement electrode 11.

[0126] (N) Further, the water quality item of the target liquid X1 detected by the electrode device 10 according to the above embodiment is pH or a specific ion. That is, the measurement electrode 11 has a configuration including a measurement internal liquid 14 and a response film 15. However, the electrode device 10 is not limited to such a configuration.

[0127] For example, the water quality item of the target liquid X1 detected by the electrode device 10 may be an oxidation-reduction potential (ORP). And in such a case, the measurement electrode 11 may have a configuration in which, for example, the measurement inner electrode 12 is exposed and arranged so that the measurement inner electrode 12 is in contact with the target liquid X1 (for example, the measurement inner electrode 12 is fixed to the tip of the measurement housing portion 13), and the measurement electrode 11 does not include the measurement internal liquid 14 and the response film 15.

[0128] (O) Incidentally, for example, in the claims, the specification, and the drawings, the execution order of each step such as the operations, procedures, steps, and stages in the method and apparatus shown can be realized in any order as long as the result of the previous step is not used in the subsequent step. For example, even if it is described for convenience using "first", "next", etc., it does not mean that it is essential to execute in this order.

Explanation of Reference Numerals

[0129] 1... Water quality measurement device, 2... Processing device, 2a... Input unit, 2b... Processing unit, 2c... Output unit, 3... Communication means, 10... Electrode device, 10a... First end portion, 10b... Second end portion, 11... Measurement electrode, 12... Measurement inner electrode, 13... Measurement housing portion, 13a... First end portion, 14... Measurement internal liquid, 15... Response film, 16... Lead wire, 17... Measurement sealing portion, 21... Comparison electrode, 22... Comparison inner electrode, 22a... First end face, 23... Comparison housing portion, 23a... First housing portion, 23b... Second housing portion, 23c... First end portion, 23d... Second end portion, 23e... Opening, 24... Comparison internal liquid, 24a... First internal liquid, 24b... Second internal liquid, 25... Liquid junction portion, 25a... First end portion, 25b... Second end portion, 26... Lead wire, 27... Comparison sealing portion, 28... Dissolving material, 28a... Granular material, 29... Coating material, 31... Temperature sensor, 32... Housing, 32a... First end portion, 33... Cover, 33a... Opening, 34... Terminal, D1... First direction, X1... Target liquid

Claims

1. An electrode device comprising a reference electrode, wherein the reference electrode comprises a reference inner electrode containing a first component, a reference housing portion that houses the reference inner electrode therein, a reference internal liquid that is housed inside the reference housing portion and immerses the reference inner electrode, and a dissolution material that contains the first component and is disposed in a solid state inside the reference internal liquid, the electrode device.

2. The surface area of the dissolution material in contact with the reference internal liquid is larger than the surface area of the reference inner electrode in contact with the reference internal liquid, the electrode device according to Claim 1.

3. The mass of the first component of the reference inner electrode is larger than the mass of the first component of the dissolution material, and the reference electrode comprises a coating material that covers the surface of the reference inner electrode, the electrode device according to Claim 2.

4. The reference electrode comprises a liquid junction portion that electrically connects the target liquid and the reference internal liquid, and the reference housing portion comprises a first housing portion where the liquid junction portion is disposed, and a second housing portion where the reference inner electrode and the dissolution material are respectively disposed inside, the second housing portion extends in a cylindrical shape from a first end portion to a second end portion, and the second housing portion has an opening at the second end portion, and communicates with the first housing portion only through the opening, the electrode device according to any one of Claims 1 to 3.

5. The reference inner electrode and the dissolution material are respectively disposed closer to the first end portion side than the center of the second housing portion, the electrode device according to Claim 4.

6. The dissolution material is disposed at the first end portion of the second housing portion, the reference electrode comprises a coating material that covers the surface of the reference inner electrode, and the coating material covers all of the surface of the reference inner electrode on the second end portion side of the second housing portion with respect to the center of the reference inner electrode, the electrode device according to Claim 5.

7. A part of the surface of the reference inner electrode is in contact with a part of the surface of the dissolution material, the electrode device according to Claim 5 or 6.

8. The dissolution material comprises a plurality of granular materials formed in a granular shape, and the plurality of granular materials are stored at the first end portion of the second housing portion, the electrode device according to any one of Claims 4 to 7.

9. The reference internal liquid comprises a first internal liquid housed inside the first housing portion, and a second internal liquid housed inside the second housing portion, and the jelly strength of the first internal liquid is larger than the jelly strength of the second internal liquid, the electrode device according to any one of Claims 4 to 8.

10. The reference internal liquid comprises a first internal liquid housed inside the first housing portion, A second internal liquid accommodated inside the second accommodating portion. The first internal liquid is a gel. The electrode device according to any one of claims 4 to 9, wherein the second accommodating portion is held in a position with respect to the first accommodating portion by the first internal liquid.

11. The electrode device according to any one of claims 1 to 10, further comprising a measurement electrode for measuring the water quality value of the target liquid based on the potential difference with the reference electrode.

12. Comprising a measurement electrode for measuring the water quality value of the target liquid based on the potential difference with the reference electrode. The measurement electrode A measurement inner electrode A measurement accommodating portion that accommodates the measurement inner electrode therein. A measurement internal liquid that is accommodated inside the measurement accommodating portion and immerses the measurement inner electrode. The electrode device according to claim 9 or 10, wherein the jelly strength of the second internal liquid is greater than the jelly strength of the measurement internal liquid.

13. A water quality measurement device comprising the electrode device according to any one of claims 1 to 12.

14. A water quality measurement method for measuring the water quality value of a target liquid using the electrode device according to any one of claims 1 to 12.

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