Water quality solid state detector, detection assembly and detection method

Abstract

The invention discloses a water quality solid state detector, a detection assembly and a detection method wherein the water quality solid state detector comprises: a detection tube having a through tube cavity; the detection test paper is fixed at the first end of the detection tube and is loaded with an indicator which is suitable for reacting with a substance to be detected to generate color change response; the water absorption part is arranged in the tube cavity, is in contact with the detection test paper and is used for absorbing moisture of liquid to be detected in the detection test paper, so that a substance to be detected is enriched on the detection test paper; the piston part is arranged in the pipe cavity in a sliding and sealing mode and tightly attached to the water absorption part so as to be matched with the volume change generated after the water absorption part absorbs water in a sliding mode. According to the present invention, the enrichment of the substance to be detected on the detection test paper can be effectively achieved so as to produce the effective color change response, the color change amplitude can achieve the human eye distinguishable degree, the low-concentration test paper detection is achieved, and the dissolution of the indicator due to the long-time soaking of the detection test paper can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and in particular to a water quality solid-state detector, a detection component and a detection method. Background Art

[0002] Water quality testing is one of the key links in scenarios such as environmental water monitoring and drinking water quality control. At present, the testing of water quality indicators is generally divided into quantitative testing and semi-quantitative testing.

[0003] Quantitative testing requires high accuracy of water quality indicators, such as chemical titration, spectrophotometry, electrochemistry, and instrument detection. Chemical methods usually require complex chemical reagents and strict detection conditions, while instrument detection is usually expensive and has high technical requirements for detection personnel.

[0004] Semi-quantitative testing has relatively low requirements for detection accuracy and is widely used in the field of rapid testing. The test paper method is one of the most important methods in semi-quantitative testing. Usually, the liquid to be tested is dripped onto the test paper, or the test paper is immersed in the test liquid for a period of time, and then taken out and compared with the colorimetric card to determine the value of the test indicator.

[0005] For the test paper detection method, the detection principle is: an indicator is loaded on the test paper, and the indicator changes color after reacting with the substance corresponding to the index to be tested. The degree of color change is directly related to the content or concentration of the corresponding substance, and then the value of the corresponding index to be tested can be obtained by comparing with the colorimetric card. If the content / concentration of the index or substance to be tested is low, the color of the indicator on the test paper will not change significantly, so the test paper has a detection limit, and the value is much higher than the detection limit of the chemical method or instrumental method. For water samples below the detection limit, it is usually impossible to detect with test paper, which greatly limits the test paper detection method.

[0006] If the test paper is to detect the index of low-concentration water samples, it is necessary to achieve an enrichment effect on the test paper to increase the amount of the test material that reacts with the indicator, thereby increasing the color change response of the indicator to the test material. At present, the commonly used enrichment method is to increase the time the test paper is immersed in the test liquid, so that the indicator continuously reacts with the test material to enhance the color change response. However, the indicator usually has a certain water solubility. When the test paper is immersed in the test liquid for a long time, the indicator will dissolve into the test liquid to make the test paper partially fade. Even the test paper that has been fixed cannot guarantee that it will not dissolve completely under the condition of long-term immersion; and once the indicator dissolves, it will contaminate the test liquid or produce harmful waste liquid, while reducing the load of the indicator on the test paper, which will reduce the color change response of the indicator, making it difficult to achieve the purpose of low-concentration water sample detection. Summary of the invention

[0007] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a water quality solid-state detector, a detection component and a detection method, which have the advantage of being able to detect low-concentration samples.

[0008] The purpose of the present invention is achieved by the following technical solutions: According to a first aspect of an embodiment of the present disclosure, there is provided a water quality solid-state detector, comprising: The detection tube has a through-going lumen; A test strip fixed to the first end of the test tube and loaded with an indicator suitable for reacting with the substance to be tested to produce a color change response; a water absorbing part, arranged in the tube cavity and in contact with the test paper, for absorbing the water of the test liquid in the test paper so that the test substance is enriched in the test paper; and The piston part is slidingly sealed and arranged in the tube cavity and closely attached to the water absorbing part so as to slide and adapt to the volume change generated by the water absorbing part after absorbing water.

[0009] To implement the above technical solution, when conducting water quality testing, the test liquid is dripped onto the test paper, and the test liquid and the test substance therein diffuse from the surface of the test paper to the inside. Since the water absorption part is in contact with the test paper, when the test liquid soaks the test paper, the water absorption part will absorb the water therein, while the test substance is enriched on the test paper to react with the indicator. During the dripping process, the indicator will migrate to the upper surface of the test paper due to the capillary action of the fibers inside the test paper, and react with the test substance. When a sufficient amount of the test liquid is dripped, enough test substance will be enriched on the test paper, thereby generating an effective color change response, and the color change amplitude can reach a level that can be distinguished by the human eye, thereby realizing low-concentration test paper detection, and will not cause the indicator to dissolve due to long-term immersion of the test paper, affecting the color change effect; and when the water absorption part absorbs water and expands, it can push the piston part to slide, so that there is enough space in the lumen to accommodate the water absorption part, thereby meeting a larger water absorption demand.

[0010] In some exemplary embodiments, the water absorbent portion is formed of water absorbent powder tightly filled in the lumen.

[0011] In some exemplary embodiments, the water-absorbent powder is one or a mixture of sodium polyacrylate and potassium polyacrylate.

[0012] In some exemplary embodiments, the volume of the water absorbing portion is 0.1 to 5 cm 3 .

[0013] In some exemplary embodiments, the test paper is one of a residual chlorine test paper, a total chlorine test paper, a total bromine test paper, and a total hardness test paper.

[0014] By implementing the above technical solution, it is possible to select corresponding test strips to meet different detection requirements.

[0015] In some exemplary embodiments, the test strip is fixed to the first end of the test tube by an adhesive.

[0016] In some exemplary embodiments, the test paper is coated with a polymer layer to limit the dissolution of the indicator.

[0017] In some exemplary embodiments, the polymer layer is made of a mixture of one or more of alginate, carboxymethyl cellulose salt, quaternary ammonium cellulose, and hydroxyethyl cellulose.

[0018] In some exemplary embodiments, the polymer layer has a thickness of 0.05-5 μm.

[0019] In some exemplary embodiments, the polymer layer carries positive charges or negative charges.

[0020] To implement the above technical solution, the polymer layer can be combined with the cellulose material of the test paper through intermolecular hydrogen bonds. When the test paper is in direct contact with the test liquid, the polymer layer will not dissolve in water in a short time. The polymer layer is hydrophilic and will not affect the water absorption effect of the test paper as a whole, but it can slow down the wetting speed of the test paper with water. At the same time, the polymer layer will prevent the indicator from penetrating to the outer surface of the test paper, especially when the polymer layer carries a corresponding positive charge or negative charge, it can combine with the indicator molecules with opposite charges through electrostatic action, so that the indicator can be evenly distributed inside the test paper, and will not be affected by the test liquid dripped outside the test paper and present an uneven state.

[0021] In some exemplary embodiments, a sealing ring is disposed on the outer sleeve of the piston portion, and the sealing ring is sealingly matched with the inner wall of the detection tube.

[0022] The implementation of the above technical solution improves the sealing performance between the piston part and the detection tube to prevent the water absorbing powder in the water absorbing part from leaking.

[0023] In some exemplary embodiments, a base is further included, which is connected to the piston portion via a connecting rod and is located outside the detection tube.

[0024] To implement the above technical solution, a base is provided to facilitate the stable placement of the detection tube so that the detection process can be carried out. At the same time, before the detection, the detection tube can be pressed down to apply reverse pressure to the piston part to press the water absorption part tightly against the test paper. It is also convenient to manually pull the piston part to provide sufficient accommodating space for the water absorption part when the water absorption part absorbs water and expands during the detection process. Of course, the detection tube will also be automatically lifted when the water absorption part absorbs water and expands during the detection process.

[0025] In some exemplary embodiments, the first end of the detection tube is further provided with a protective cover.

[0026] By implementing the above technical solution, the protective cover can be used to shield the test paper from light and protect it from moisture and oxidation, so as to prevent the test paper from being deteriorated by light, air and water vapor. In particular, for certain indicators that are easily decomposed and oxidized by light, effective protection can be formed to extend the service life of the detector.

[0027] According to a second aspect of an embodiment of the present disclosure, there is provided a water quality detection component, comprising: The solid-state water quality detector as described in the first aspect; and A dropper is used to absorb or contain the liquid to be tested, and to drop the liquid to be tested onto the test paper drop by drop.

[0028] To implement the above technical solution, a dropper is provided to conveniently absorb or hold the test liquid and drip it onto the test body for testing, so that the device can be easily carried outdoors for sampling and testing at any time.

[0029] In some exemplary embodiments, the dropper comprises: A tube body having a liquid dripping port, wherein a cavity for storing the liquid to be tested is formed in the tube body, and an end of the tube body opposite to the liquid dripping port is open; and A soft rubber head is sealed and connected to the opening, and the soft rubber head can be pressed to discharge the air in the tube body, or reset to suck the liquid to be tested into the cavity.

[0030] To implement the above technical solution, when sucking the test liquid, first squeeze the soft rubber head to expel the air in the tube body, then extend the dripping port into the test liquid, and after releasing the soft rubber head, the soft rubber head recovers under the action of its own elastic restoring force, thereby adsorbing the test liquid into the tube body from the dripping port to achieve the sampling action.

[0031] In some exemplary embodiments, the tube body is made of a hydrophobic material or a hydrophobic layer is provided on the surface and inner wall of the tube body.

[0032] By implementing the above technical solution, the residual amount of the test liquid on the tube body is reduced, so that as much as possible of the sample can be dripped onto the test paper after one sampling.

[0033] According to a third aspect of an embodiment of the present disclosure, a water quality detection method is provided, comprising: Take a solid-state water quality detector as described in the first aspect and place it vertically on the detection platform with the detection test paper exposed; Adding the test liquid drop by drop to the test paper and allowing the drop to completely pass through the test paper to be absorbed by the water absorption part until a predetermined volume matching the test requirements is added; After standing for a predetermined time until the reaction is complete, the color of the test paper is compared with the standard color card to obtain the test data.

[0034] To implement the above technical solution, detection is performed by sampling a water quality solid-state detector, and a corresponding volume of the test liquid is added according to different test requirements. Since the water absorption part can absorb the water in the test paper, the test substance is enriched on the test paper and reacts with the indicator, thereby producing an effective color change response, and the color change amplitude can reach a level that can be distinguished by the human eye, thereby realizing low-concentration test paper detection, and will not cause the indicator to dissolve due to long-term immersion of the test paper, affecting the color change effect.

[0035] In some exemplary embodiments, the method further comprises: The liquid to be tested is sucked through the dropper in the water quality testing assembly as described in the second aspect, and the liquid to be tested is dripped onto the test paper drop by drop through the dripping port.

[0036] The above technical solution is implemented, and sampling and dripping are performed through a dropper, making the detection process simpler.

[0037] In some exemplary embodiments, the method further comprises: Before adding the test liquid, the piston is pressed to make the water absorbing part completely fit the test paper.

[0038] By implementing the above technical solution, the water absorption part can effectively absorb the water in the test paper, which is beneficial to the enrichment of the detection substance.

[0039] In summary, compared with the prior art, the present invention has the following beneficial effects: The embodiment of the present invention provides a water quality solid-state detector, a detection component and a detection method. When performing water quality detection, a test liquid is dripped onto a test paper. The test liquid and the test substance therein diffuse from the surface of the test paper to the inside. Since the water absorption part is in contact with the test paper, when the test liquid soaks the test paper, the water absorption part absorbs the water therein, while the test substance is enriched on the test paper to react with the indicator. During the dripping process, the indicator is subjected to the capillary action of the fibers inside the test paper and migrates to the upper surface of the test paper and reacts with the test substance. When a sufficient amount of the test liquid is dripped, sufficient test substance is enriched on the test paper, thereby generating an effective color change response, and the color change amplitude can reach a level that can be distinguished by the human eye, thereby realizing low-concentration test paper detection, and will not cause the indicator to dissolve due to long-term immersion of the test paper, thereby affecting the color change effect. When the water absorption part absorbs water and expands, it can push the piston part to slide, so that there is enough space in the lumen to accommodate the water absorption part, thereby meeting a larger water absorption demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the structure of the solid-state water quality detector in the first embodiment of the present invention.

[0041] Figure 2 Schematic diagram of the structure of the solid-state water quality detector in the second embodiment of the present invention.

[0042] Figure 3 Schematic diagram of the structure of the dropper of the solid water quality detection component in the third embodiment of the present invention.

[0043] Figure 4 Schematic diagram of the structure of the dropper of the solid water quality detection component in the fourth embodiment of the present invention.

[0044] The numbers and letters in the figure represent the corresponding component names: 10. Detection tube; 11. Tube cavity; 20. Detection test paper; 21. Adhesive; 22. Polymer layer; 30. Water absorption part; 40. Piston part; 41. Sealing ring; 42. Base; 43. Connecting rod; 50. Protective cover; 60. Dropper; 61. Tube body; 62. Dropping port; 63. Soft rubber head. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1 like Figure 1 As shown, an embodiment of the present invention provides a water quality solid-state detector, including: a detection tube 10, having a tubular cavity 11 set through; a detection test paper 20, fixed to the first end of the detection tube 10 and loaded with an indicator suitable for reacting with a substance to be detected to produce a color change response; a water absorption part 30, arranged in the tubular cavity 11 and in contact with the detection test paper 20, for absorbing moisture from the test liquid in the detection test paper 20, so that the substance to be detected is enriched in the detection test paper 20; and a piston part 40, which is slidably sealed and arranged in the tubular cavity 11 and is tightly attached to the water absorption part 30, so as to slide and adapt to the volume change generated by the water absorption part 30 after absorbing water.

[0047] Specifically, the detection tube 10 as a whole is a cavity structure with a certain thickness, the middle of which is a through tube cavity 11. The cross-sectional shape of the detection tube 10 is preferably circular, elliptical or square, and particularly preferably circular. Usually, the thickness of the detection tube 10 is set to 0.05mm~2mm, the length is set to 20~50mm, and the side length or diameter is set to 3~10mm. The specific selection is made according to the detection requirements. Usually, several fixed types of detection tubes 10 can be set for use as needed. The detection tube 10 is made of glass or plastic material, preferably transparent glass or transparent plastic material, so that the changes of the water absorption part 30 can be observed during the detection process, and the first end of the detection tube 10 is provided with a limit ring, which can prevent the water absorption part 30 from lifting the detection test paper 20 after swelling after absorbing water, and can provide a larger installation space for the detection test paper 20 on the other hand.

[0048] The test paper 20 is filter paper, tissue paper, cellulose paper or other paper textiles loaded with an indicator. Different types of indicators can be selected according to the detection requirements and loaded on the test paper 20. For example, when residual chlorine detection is required, the indicator can be selected from N,N-diethyl-p-phenylenediamine (DPD). The test paper 20 can be one of the residual chlorine test paper 20, total chlorine test paper 20, total bromine test paper 20, and total hardness test paper 20. Of course, other commonly used test papers 20 can also be selected in other embodiments, so that the corresponding test paper 20 can be selected to meet different detection requirements.

[0049] The test paper 20 is bonded to the first end of the test tube 10 by bonding the adhesive 21. The adhesive 21 is coated on the end of the test tube 10 and / or the end of the limit ring to bond to the test paper 20. The adhesive 21 should not contain components that can chemically react with the indicator and water. In some embodiments, the test paper 20 can also be set as a bonding part and a detection part. The bonding part corresponds to the adhesive 21, and the indicator may not be loaded. The detection part corresponds to the tube cavity 11 and is in close contact with the water absorption part 30.

[0050] The water-absorbing part 30 is formed by water-absorbing powder tightly filled in the tube cavity 11. The water-absorbing powder is a polymer resin powder with strong water absorption. Preferably, the water-absorbing powder is one or a mixture of sodium polyacrylate and potassium polyacrylate; the water-absorbing powder is in a tightly stacked state and filled in the space surrounded by the piston part 40, the test paper 20 and the detection tube 10, so that the water-absorbing part 30 is in contact with the lower surface of the test paper 20. The volume of the water-absorbing part 30 is 0.1~5 cm3. It should be noted that the volume of the water-absorbing part 30 should not be less than the volume of the test liquid to be added.

[0051] As described above, a number of test tubes 10 of corresponding specifications can be set according to different detection requirements. Corresponding to different detection requirements, the corresponding volume of the test liquid to be added can also be determined. Therefore, the test tubes 10 of corresponding specifications can be provided with a water absorption part 30 of corresponding volume to adapt to the corresponding detection requirements.

[0052] The piston part 40 is an integrally formed block, and a sealing ring 41 is provided on the outer sleeve of the piston part 40. The sealing ring 41 is sealed with the inner wall of the detection tube 10. The sealing ring 41 can be fixed to the piston part 40 by bonding, and is usually located to improve the connection stability between the sealing ring 41 and the piston part 40. There are also matching annular grooves and connecting convex rings between the sealing ring 41 and the piston part 40. The sealing ring 41 improves the sealing between the piston part 40 and the detection tube 10 to prevent the water-absorbing powder in the water-absorbing part 30 from leaking.

[0053] During processing, the piston part 40 is usually moved to a position of corresponding volume first, and is fixed by a corresponding tooling, and then the water-absorbing powder is filled into the tube cavity 11 from the first end of the detection tube 10, and the water-absorbing powder is compacted by an adapted jig to form a tight water-absorbing part 30, and the water-absorbing part 30 is made flush with the end surface of the first end of the detection tube 10, and then the adhesive 21 is applied to the end surface of the first end of the detection tube 10, and the test paper 20 is bonded and fixed to fit with the water-absorbing part 30; of course, in other embodiments, the detection tube 10 can also be 10 is inverted in a special fixture, and a proper amount of absorbent powder is filled into the tube cavity 11 from the second end of the detection tube 10, and then the piston part 40 is installed from the second end of the detection tube 10, and then the piston part 40 is pressed against the absorbent powder to form a dense absorbent part 30, and finally the test paper 20 is adhered. In this embodiment, since air remains in the tube cavity 11 when the piston part 40 is installed, in order to ensure that the piston part 40 can be stably pushed forward, it is necessary to provide an exhaust structure such as exhaust micropores on the piston part 40 to gradually exhaust the air therein during the process of pushing the piston.

[0054] When testing water quality, the test liquid is dripped onto the test paper 20. The test liquid and the test substance therein diffuse from the surface of the test paper 20 to the inside. Since the water absorption part 30 is in contact with the test paper 20, when the test liquid soaks the test paper 20, the water absorption part 30 absorbs the water therein, while the test substance is enriched on the test paper 20 to react with the indicator. During the dripping process, the indicator is affected by the capillary action of the internal fibers of the test paper 20 and migrates to the upper surface of the test paper 20, and reacts with the test substance. When a sufficient amount of the test liquid is added, the test paper 20 will be enriched with enough test substances, thereby generating an effective color change response, and the color change amplitude can reach a level that can be distinguished by the human eye, thereby realizing low-concentration test paper detection, and will not cause the indicator to dissolve due to long-term immersion of the test paper 20, thereby affecting the color change effect; and when the water absorption part 30 absorbs water and expands, it can push the piston part 40 to slide, so that there is enough space in the lumen 11 to accommodate the water absorption part 30, thereby meeting a larger water absorption demand.

[0055] Furthermore, the test paper 20 is coated with a polymer layer 22 to limit the dissolution of the indicator. The polymer layer 22 is combined with the cellulose material of the test paper 20 through intermolecular hydrogen bonds. The polymer layer 22 is made of a mixture of one or more of alginate, carboxymethyl cellulose salt, quaternary ammonium cellulose, and hydroxyethyl cellulose. The thickness of the polymer layer 22 is 0.05~5μm, which is selected according to actual detection requirements, and preferably, the polymer layer 22 carries a positive charge or a negative charge.

[0056] The polymer layer 22 can be combined with the cellulose material of the test paper 20 through intermolecular hydrogen bonds. When the test paper is in direct contact with the test liquid, the polymer layer 22 will not dissolve in water in a short time. The polymer layer 22 is hydrophilic and will not affect the water absorption effect of the test paper 20 as a whole, but it can slow down the infiltration speed of the test paper 20 with water; at the same time, the polymer layer 22 will prevent the indicator from penetrating to the outer surface of the test paper 20, especially when the polymer layer 22 has a corresponding positive charge or negative charge, it can be combined with the indicator molecules with opposite charges through electrostatic action, so that the indicator can be evenly distributed inside the test paper 20, and will not be affected by the test liquid dripped from the outside of the test paper 20 and present an uneven state.

[0057] In some embodiments, a protective cover 50 is further provided at the first end of the detection tube 10 to cover the detection test paper 20. The protective cover 50 is connected to the detection tube 10 by a threaded connection, or can also be directly sleeved on the detection tube 10 and fixed by snap-fitting or the like. The protective cover 50 is made of plastic or rubber material, and the protective cover 50 is opaque, and is preferably integrally formed of black plastic. The protective cover 50 can shield the detection test paper 20 from light, moisture, and oxidation, so as to prevent the detection test paper 20 from being deteriorated by light or oxygen or water vapor. In particular, for certain indicators that are easily decomposed or oxidized by light, effective protection can be formed to extend the service life of the detector.

[0058] Embodiment 2 The difference between this embodiment and the first embodiment is that: in this embodiment, Figure 2 As shown, it also includes a base 42, which is connected to the piston part 40 through a connecting rod 43 and is located outside the detection tube 10. The base 42 can be a solid plastic block as a whole, and the size of the base 42 is not less than the outer size of the detection tube 10, which refers to the diameter or length, so as to provide a sufficient placement plane to improve stability, and a small distance should be left between the base 42 and the second end of the detection tube 10 so that the piston part 40 can be pushed inward when necessary to make the water absorption part 30 fit the detection test paper 20.

[0059] The base 42 is provided to facilitate the stable placement of the detection tube 10 so as to facilitate the detection process. Before the detection, the detection tube 10 can be pressed down to apply reverse pressure to the piston part 40 to press the water absorption part 30 tightly against the detection paper 20. It is also convenient to manually pull the piston part 40 to provide sufficient accommodating space for the water absorption part 30 when the water absorption part 30 absorbs water and expands during the detection process. Of course, the detection tube 10 will also be automatically lifted when the water absorption part 30 absorbs water and expands during the detection process.

[0060] Embodiment 3 The embodiment of the present invention provides a water quality detection assembly, including: a solid-state water quality detector as described in the first or second embodiment; and a dropper 60, the dropper 60 is used to absorb or contain the test liquid and to drop the test liquid onto the test paper 20 drop by drop.

[0061] Specifically, Figure 3 As shown, the dropper 60 includes: a tube body 61 with a dripping port 62, a cavity for storing the test liquid is formed in the tube body 61, and the end of the tube body 61 opposite to the dripping port 62 is open; and a soft rubber head 63 sealed and connected to the opening, the soft rubber head 63 can be pressed to expel the air in the tube body 61, or reset to suck the test liquid into the cavity.

[0062] The tube body 61 is made of a hydrophobic material or a hydrophobic layer is provided on the surface and inner wall of the tube body 61. When the hydrophobic layer is provided, the tube body 61 can be integrally formed of glass or plastic material. The hydrophobic material can be, for example, one or more of polytetrafluoroethylene, fluorinated ethylene-tetrafluoroethylene copolymer, polyperfluoroethylene propylene and aluminum silicate fiber. The hydrophobic layer can also be formed by coating the above materials on the surface and inner wall of the tube body 61, thereby reducing the test liquid remaining on the tube body 61, so that after a sampling, it can be dripped onto the test paper 20 as much as possible.

[0063] The soft rubber head 63 is usually formed in one piece from a rubber material, and its cross-section is circular or elliptical, and has good elastic recovery ability, and the soft rubber head 63 is sealed and connected to the tube body 61 by welding, bonding, etc., and the internal volume of the soft rubber head 63 is slightly smaller than the internal volume of the tube body 61, or is basically the same, so that after squeezing the soft rubber head 63 once, the tube body 61 can be basically filled with the test liquid. Of course, in some embodiments, a scale can also be set on the tube body 61 to determine the volume of the test liquid absorbed; the volume in the tube body 61 is usually set to 0.1~5mL according to actual detection requirements, corresponding to the volume of the water absorption part 30, and the dripping volume of each drop can be controlled at 5~50μL, matching the area of ​​the test paper 20, and usually there are marking lines or scale lines on the tube body 61 to indicate the sampling volume to improve the accuracy of the detection.

[0064] When absorbing the test liquid, first squeeze the soft rubber head 63 to expel the air in the tube body 61, then extend the dripping port 62 into the test liquid, and after releasing the soft rubber head 63, the soft rubber head 63 recovers under the action of its own elastic restoring force, so that the test liquid is adsorbed into the tube body 61 from the dripping port 62 to achieve the sampling action; by providing the dripping tube 60, it is convenient to absorb or hold the test liquid and drip it on the test body for testing, so that it can be easily carried outdoors for sampling and testing at any time.

[0065] Embodiment 4 The difference between this embodiment and the third embodiment is that: in this embodiment, Figure 4 As shown, the dropper 60 is integrally formed of rubber or soft plastic, and a dripping port 62 is also formed at the bottom of the dropper 60. The top of the dropper 60 is sealed, and the whole has good elastic recovery ability. When the outer side of the dropper is squeezed to deform it, the internal air can be discharged. When it is released, the test liquid can be sucked into the dropper 60 from the dripping port 62 during the recovery process to complete the sampling process. The preferred dropper 60 is made of transparent soft plastic, and a marking line or scale line is set on the dropper 60 to determine the sampling volume. During the test, the dropper 60 is slowly squeezed to squeeze out the test liquid drop by drop.

[0066] Embodiment 5 The embodiment of the present invention provides a water quality detection method, comprising: S100, take a solid-state water quality detector as described in Example 1 or Example 2 and place it vertically on the detection platform to expose the test paper 20, that is, open the protective cover 50, and place the water quality detector vertically and stably on a flat work surface.

[0067] S200 , dripping the test liquid onto the test paper 20 drop by drop, and allowing the liquid drop to completely penetrate the test paper 20 to be absorbed by the water absorbing part 30 , until the liquid drop reaches a predetermined volume matching the test requirement.

[0068] If it is actually observed that the water absorbing part 30 is not tightly attached to the test paper 20, the piston part 40 is pressed before the test liquid is added to make the water absorbing part 30 completely attached to the test paper 20, so that the water absorbing part 30 can effectively absorb the moisture in the test paper 20, which is beneficial to the enrichment of the test substance.

[0069] When sampling and dripping, the liquid to be tested is sucked through the dropper 60 in the water quality detection assembly as described in Example 3 or Example 4, and the liquid to be tested is dripped onto the test paper 20 drop by drop through the dripping port 62. The dripping volume of each drop is controlled to be 5-50 μL. Usually, the drop is dropped at the center of the test paper 20 and basically covers the entire test paper 20 to reduce the obvious color difference between the middle and the surrounding of the test paper 20. After the drop is basically absorbed by the test paper 20, another drop is dripped. If it is found that the water absorbing part 30 cannot absorb water well during the dripping process, the water absorbing part 30 can also be made to fit with the test paper 20 by lightly pressing the test tube 10, thereby improving the water absorption effect.

[0070] S300, after standing for a predetermined time until the reaction is completed, the color of the test paper 20 is compared with the standard color card to obtain test data. The colorimetric process can be observed manually or automatically identified by visual detection equipment. The time interval from dripping to colorimetric is the reaction time of the test paper. Usually, for the detection of the same indicator, the time interval needs to be controlled to remain consistent to reduce the detection error caused by time error. In actual application, an indicator table of the detection time corresponding to the detection indicator can also be set, and the time interval from dripping to colorimetric is controlled according to the indicator table during detection.

[0071] The detection is carried out by sampling the water quality solid-state detector, and the corresponding volume of the test liquid is added according to different test requirements. Since the water absorption part 30 can absorb the water in the test paper 20, the test substance is enriched on the test paper 20 to react with the indicator, thereby generating an effective color change response, and the color change amplitude can reach a level that can be distinguished by the human eye, realizing low-concentration test paper detection, and will not cause the indicator to dissolve due to long-term immersion of the test paper 20, affecting the color change effect.

[0072] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A solid-state water quality detector, characterized in that: include: The detection tube has a through-going lumen; A test strip fixed to the first end of the test tube and loaded with an indicator suitable for reacting with the substance to be tested to produce a color change response; A water absorbing part, arranged in the tube cavity and in contact with the test paper, for absorbing the water of the test liquid in the test paper so that the test substance is enriched in the test paper; as well as, The piston part is slidingly sealed and arranged in the tube cavity and closely attached to the water absorbing part so as to slide and adapt to the volume change generated by the water absorbing part after absorbing water.

2. The water quality solid state detector according to claim 1, characterized in that: The water absorbing part is formed of water absorbing powder which is densely filled in the lumen.

3. The solid-state water quality detector according to claim 2, characterized in that: The water-absorbing powder is one of sodium polyacrylate and potassium polyacrylate or a mixture of the two.

4. The solid-state water quality detector according to claim 2 or 3, characterized in that: The volume of the water absorbing part is 0.1~5 cm 3 .

5. The water quality solid state detector according to claim 1, characterized in that: The test paper is one of residual chlorine test paper, total chlorine test paper, total bromine test paper and total hardness test paper.

6. The solid-state water quality detector according to claim 1 or 5, characterized in that: The test paper is adhered to the first end of the test tube by an adhesive.

7. The solid-state water quality detector according to claim 1, characterized in that: The test paper is coated with a polymer layer to limit the dissolution of the indicator.

8. The solid-state water quality detector according to claim 7, characterized in that: The polymer layer is prepared by mixing one or more of alginate, carboxymethyl cellulose salt, quaternary ammonium cellulose and hydroxyethyl cellulose.

9. The solid-state water quality detector according to claim 7 or 8, characterized in that: The thickness of the polymer layer is 0.05-5 μm.

10. The solid-state water quality detector according to claim 7 or 8, characterized in that: The polymer layer carries positive or negative charges.

11. The solid-state water quality detector according to claim 1, characterized in that: The piston portion is outer-coated with a sealing ring, and the sealing ring is sealed with the inner wall of the detection tube.

12. The solid-state water quality detector according to claim 1 or 11, characterized in that: It also includes a base, which is connected to the piston part through a connecting rod and is located outside the detection tube.

13. The solid-state water quality detector according to claim 12, characterized in that: The first end of the detection tube is also provided with a protective cover.

14. A water quality detection component, characterized in that: include: A solid-state water quality detector as claimed in any one of claims 1 to 13; as well as, A dropper is used to absorb or contain the liquid to be tested, and to drop the liquid to be tested onto the test paper drop by drop.

15. The water quality detection component according to claim 14, characterized in that: The dropper comprises: A tube body having a liquid dripping port, wherein a cavity for storing the liquid to be tested is formed in the tube body, and an end of the tube body opposite to the liquid dripping port is open; and A soft rubber head is sealed and connected to the opening, and the soft rubber head can be pressed to discharge the air in the tube body, or reset to suck the liquid to be tested into the cavity.

16. The water quality detection component according to claim 15, characterized in that: The tube body is made of a hydrophobic material or a hydrophobic layer is arranged on the surface and inner wall of the tube body.

17. A water quality detection method, characterized in that: include: Take a solid-state water quality detector as described in any one of claims 1 to 13 and place it vertically on the detection platform with the detection test paper exposed; Adding the test liquid drop by drop to the test paper and allowing the drop to completely pass through the test paper to be absorbed by the water absorption part until a predetermined volume matching the test requirements is added; After standing for a predetermined time until the reaction is complete, the color of the test paper is compared with the standard color card to obtain the test data.

18. The water quality detection assembly according to claim 17, characterized in that: Also includes: The liquid to be tested is sucked by the dropper in the water quality testing assembly according to any one of claims 14 to 15, and the liquid to be tested is dripped onto the test paper drop by drop through the dripping port.

19. The water quality detection assembly according to claim 17, characterized in that: Also includes: Before adding the test liquid, the piston is pressed to make the water absorbing part completely fit the test paper.

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