Total organic carbon meter, combustion reaction unit, and total organic carbon measurement method

Abstract

This total organic carbon meter 100, which measures the total organic carbon contained in a liquid sample in order to prevent mixing of different types of granular bodies and ensure intended combustion performance in a vaporization member in which two or more layers of different types of granular bodies are stacked, comprises a combustion reaction unit 32 for burning the total organic carbon contained in the liquid sample to generate carbon dioxide, and a carbon dioxide detection unit X for detecting the carbon dioxide generated by the combustion reaction unit 32, wherein the combustion reaction unit 32 is configured so as to have: a combustion furnace 33; a vaporization unit 34 that is accommodated in the combustion furnace 33, and that has at least a first layer obtained by stacking granular bodies R1, and a second layer obtained by stacking granular bodies R2 of a different type than this first layer; and a partition member 37 interposed between the first layer and the second layer.

Description

Total organic carbon meter, combustion reaction unit, and total organic carbon measurement method

[0001] The present invention relates to a total organic carbon meter used for analyzing, for example, water quality, a combustion reaction unit used therein, and a total organic carbon measurement method.

[0002] As shown in Patent Document 1, this type of total organic carbon meter is configured to introduce a liquid sample into a combustion furnace to combust the total organic carbon contained in the liquid sample and detect the carbon dioxide produced as a result.

[0003] A vaporizer made up of a large number of stacked granular materials is housed inside the combustion furnace, and multiple types of granular materials may be used to give the vaporizer desired combustion characteristics.

[0004] A more specific embodiment is, for example, a laminated structure of at least two layers, such as a first layer made of small-diameter particles and a second layer made of large-diameter particles.

[0005] When forming a vaporizing member by stacking granular materials in this way, it is necessary to fill the granular materials into a combustion furnace, and conventionally, this work has been carried out at the analysis site.

[0006] However, in poor working environments, such as in work sites with high or low temperatures or high noise levels, the above-described filling operation becomes complicated.

[0007] Therefore, a configuration has been considered in which a vaporizing member made of layered granular material is made into a cartridge in advance, thereby eliminating the need for on-site filling work.

[0008] However, when forming a vaporization element by stacking granular materials in two or more layers as described above, different types of granular materials may become mixed at the boundaries between layers due to vibrations of the cartridge-shaped vaporization element, for example, during transportation.

[0009] As a result, the vaporization element cannot exhibit the desired combustion characteristics, resulting in problems such as measurement performance being worse than expected or a discrepancy between the actual measured values ​​and predicted values ​​of the total organic carbon meter.

[0010] The above-mentioned problem is not limited to cases where the vaporizing member is made into a cartridge, but can occur in any environment where vibrations are transmitted to the vaporizing member.

[0011] Patent No. 5012580

[0012] Therefore, the present invention has been made to solve the above problems, and its main objective is to prevent different types of granular material from mixing together in an evaporation element consisting of two or more layers of different types of granular material, thereby ensuring the desired combustion characteristics.

[0013] In other words, the total organic carbon meter of the present invention is a total organic carbon meter that measures the total organic carbon contained in a liquid sample, and is equipped with a combustion reaction unit that burns the total organic carbon contained in the liquid sample to generate carbon dioxide, and a carbon dioxide detection unit that detects the carbon dioxide generated by the combustion reaction unit, and is characterized in that the combustion reaction unit has a combustion furnace main body, a vaporization member that is housed in the combustion furnace main body and has at least a first layer made of stacked granular material and a second layer made of stacked granular material of a different type from the first layer, and a partition member interposed between the first layer and the second layer.

[0014] With a total organic carbon meter configured in this manner, the first and second layers are separated by a partition member, which prevents different types of particulate matter from mixing at the boundary between these layers, allowing the vaporization member to exhibit the desired combustion characteristics.

[0015] The above-mentioned partition member may be, for example, a mesh-like member made of metal or ceramic. However, if such a mesh-like member is used, a fine mesh is required to accommodate small-diameter granular materials. This can lead to problems such as clogging due to salts and soot from the liquid sample adhering to the mesh. Therefore, it is preferable that the partition member be removed from between the first and second layers when measuring the liquid sample. In this case, the partition member is removed during measurement, thereby solving problems such as clogging that occur when using the above-mentioned mesh-like member.

[0016] It is preferable to further include a removal mechanism that removes the partition member from between the first layer and the second layer, which allows for automated removal of the partition member.

[0017] It is preferable that the removal mechanism is a heating mechanism that heats the vaporizing member when the liquid sample is measured. In this case, the heating mechanism used during measurement also serves as the removal mechanism, so there is no need for a dedicated mechanism or special operation for removing the partition member, and existing device configurations and programs can be used.

[0018] Preferably, the partition member is a combustible film, which allows the partition member to be removed from between the first and second layers without leaving any substantial residue.

[0019] It is preferable that the partition member encloses at least a portion of the granular material constituting the first layer that is located on the second layer side, or at least a portion of the granular material constituting the second layer that is located on the first layer side, which makes it possible to easily separate the first and second layers.

[0020] In order to improve the vaporization efficiency, it is preferable that one of the first layer and the second layer is made of a catalyst that improves the vaporization efficiency of the other layer.

[0021] In an embodiment in which the effects of the present invention are more pronounced, the combustion furnace body has an inner furnace body and an outer furnace body surrounding the inner furnace body, and the inner furnace body and the vaporizer are unitized and can be attached and detached together from the outer furnace body. In this case, by unitizing the inner furnace body and the vaporizer, workability such as replacing the vaporizer can be improved, while preventing the granular material from being mixed together due to vibration during transportation.

[0022] A carrier gas is supplied to the combustion reaction unit to guide the generated carbon dioxide to the carbon dioxide detection unit. Conventionally, this carrier gas is supplied through a sample introduction tube that introduces a liquid sample into the combustion reaction unit. However, when both the liquid sample and the carrier gas are passed through the sample introduction tube, the liquid sample dries out due to the carrier gas, causing suspended solids and salts in the sample to adhere to the inner wall of the sample introduction tube, resulting in clogging of the sample introduction tube and the need for maintenance. Therefore, it is preferable to further include a sample introduction tube that introduces the liquid sample into the combustion reaction unit from above the combustion reaction unit, and a carrier gas supply tube through which the sample introduction tube passes and that supplies the carrier gas to the combustion reaction unit. This configuration allows the internal flow paths of the sample introduction tube and the carrier gas supply tube to be separated, making it possible to prevent the liquid sample from drying out due to the carrier gas.

[0023] By passing a carrier gas through a sample introduction tube as in the past, the liquid sample can be introduced into the combustion reaction region without remaining in the sample introduction tube. However, as described above, when the internal flow path of the sample introduction tube and the internal flow path of the carrier gas supply tube are separated, there is a concern that the liquid sample may adhere to the lower opening of the sample introduction tube, which may result in the desired amount of liquid sample not being supplied to the combustion reaction region, leading to measurement errors. Therefore, it is preferable that the lower opening of the sample introduction tube is located further below the lower opening of the carrier gas supply tube. In this case, the carrier gas is sprayed onto the liquid sample adhering to the lower opening of the sample introduction tube, allowing the desired amount of liquid sample to be supplied to the combustion reaction region, thereby ensuring measurement accuracy.

[0024] The combustion reaction unit according to the present invention is a combustion reaction unit used in a total organic carbon meter for measuring total organic carbon in a liquid sample, and is characterized by comprising a combustion furnace body, a vaporization member housed in the combustion furnace body and having at least a first layer formed by stacking granular materials and a second layer formed by stacking granular materials of a different type from the first layer, and a partition member interposed between the first layer and the second layer. Such a combustion reaction unit can achieve the same effects as the above-mentioned total organic carbon meter.

[0025] Furthermore, a total organic carbon measurement method according to the present invention is a method for measuring total organic carbon contained in a liquid sample, comprising a combustion reaction step of combusting the total organic carbon contained in the liquid sample to generate carbon dioxide, and a carbon dioxide detection step of detecting the carbon dioxide generated by the combustion reaction unit, the method using a combustion furnace body and a vaporization element housed in the combustion furnace body and having at least a first layer formed by stacking granular material and a second layer formed by stacking granular material of a different type from the first layer, characterized in that a partition member is interposed in advance between the first layer and the second layer. This total organic carbon measurement method can achieve the same effects as the above-mentioned total organic carbon meter.

[0026] According to the present invention configured in this manner, in an evaporation element consisting of two or more layers of different types of granular material, it is possible to prevent the different types of granular material from mixing together, thereby ensuring the desired combustion characteristics.

[0027] Schematic diagram showing the configuration of a total organic carbon meter according to one embodiment of the present invention. Schematic diagram showing the flow path configuration of the same embodiment. Schematic diagram showing the internal structure of a combustion reaction unit of the same embodiment. Schematic diagram showing the unitized inner furnace body and vaporization member of the same embodiment. Schematic diagram showing a partition member of the same embodiment. Schematic diagram showing a partition member of another embodiment. Schematic diagram showing a partition member of another embodiment. Schematic diagram showing a partition member of another embodiment.

[0028] An embodiment of a total organic carbon meter according to the present invention will be described below with reference to the drawings.

[0029] The total organic carbon meter 100 of this embodiment indicates the total amount of organic matter contained in a liquid sample, such as tap water or sewage, in terms of the amount of carbon contained in the organic matter, and specifically, as shown in Figure 1, it comprises an apparatus main body 10, a sampling unit 20, a combustion reaction unit 30, a dehumidification unit 40, and a control unit 50.

[0030] 1, the device main body 10 includes a housing 11 that houses the above-described units 20 to 50, and the units 20 to 50 are attached to the housing 11 with fasteners such as screws. Note that the units 20 to 50 are detachable from the housing 11, allowing the user to customize the arrangement of the units 20 to 50 within a certain degree of freedom.

[0031] [Sampling Unit 20] As shown in Figure 2, the sampling unit 20 includes a sample container 21 for storing a liquid sample, a pretreatment unit including a valve 22 for supplying an acid such as hydrochloric acid to the sample container 21, and a carrier gas supply unit 23 for supplying a carrier gas. The liquid sample is acidified and aerated to liberate inorganic carbon contained in the liquid sample, and the liquid sample is then sent to the combustion reaction unit 30 by the carrier gas. To enable integration of organic carbon, a nebulizer may be provided upstream of the combustion reaction unit 30 (described below) to continuously measure organic carbon. By sending the liquid sample to the combustion reaction unit 30 without liberating the inorganic carbon contained in the liquid sample, the total organic carbon in the liquid sample can be measured, and the inorganic carbon measurement value can be obtained by subtracting the measurement value obtained by measuring organic carbon from the measurement value (amount or concentration) of the organic carbon.

[0032] [Combustion reaction unit 30] As shown in Figure 2, the combustion reaction unit 30 includes a sample measuring section 31 that measures a predetermined amount of the liquid sample sampled by the above-mentioned sampling unit 20, and a combustion reaction section 32 into which the measured predetermined amount of liquid sample is injected.

[0033] The sample measuring section 31 measures a predetermined amount of liquid sample, for example, by using a member with a known volume. In this embodiment, as shown in Figure 2, it is configured using a measuring tube 31 having a flow path with a fixed volume inside. Note that, in order to store liquid sample that leaks (overflows) from this measuring tube 31, the end of the measuring tube 31 is connected to a storage container 3x having a storage space inside.

[0034] The predetermined amount of liquid sample measured in this manner is injected into the combustion reaction section 32 together with the carrier gas supplied by the above-mentioned carrier gas supply section 23 by switching the three-way valve V0, which is an on-off valve connected downstream of the sample measurement section 31.

[0035] The measured predetermined amount of liquid sample is introduced into the combustion reaction section 32 through the sample introduction tube 311 as shown in FIG.

[0036] This sample introduction tube 311 introduces a liquid sample into the combustion reaction section 32 from above the combustion reaction section 32, and its lower opening 311a is located inside the combustion furnace main body 33 described later and serves as an outlet for discharging the liquid sample.

[0037] However, if both the liquid sample and the carrier gas continue to flow through the sample introduction tube 311, the liquid sample will dry out due to the carrier gas, and suspended solids and salts in the liquid sample will adhere to the inner wall of the sample introduction tube 311, which may result in clogging of the sample introduction tube 311 and require maintenance. However, if the carrier gas is not flowed, there is a risk that some of the carbon dioxide generated in the combustion reaction unit 32 will remain without being sent to the carbon dioxide detection unit X.

[0038] Therefore, as shown in FIG. 3, the combustion reaction unit 30 of this embodiment has the above-mentioned sample introduction pipe 311 passing through the interior thereof, and further includes a carrier gas supply pipe 312 that supplies carrier gas to the combustion reaction section 32.

[0039] This carrier gas supply pipe 312 constitutes a double pipe structure together with the above-mentioned sample introduction pipe 311. With this configuration, the internal space of the sample introduction pipe 311 and the internal space of the carrier gas supply pipe 312 are formed as independent flow paths through which the liquid sample and the carrier gas flow without mixing with each other.

[0040] 3, the sample introduction pipe 311 here penetrates the inside of the carrier gas supply pipe 312, and at least a portion (downstream end) of the sample introduction pipe 311 is disposed inside the carrier gas supply pipe 312. Note that the carrier gas supply pipe 312 here is composed of an upstream element 312a and a downstream element 312b, and these upstream element 312a, downstream element 312b, and sample introduction pipe 311 are connected via a joint. However, the specific configuration is not limited to this and may be changed as appropriate.

[0041] In this configuration, the lower opening 311a of the sample introduction pipe 311 is located further below the lower opening 311a of the carrier gas supply pipe 312; in other words, the lower opening 311a of the sample introduction pipe 311 is located outside the carrier gas supply pipe 312.

[0042] As shown in FIG. 2, the carrier gas supply pipe 312 in this embodiment is connected to a branch flow path L that branches off from the flow path that constitutes the above-described carrier gas supply unit 23 via a three-way valve V1.

[0043] A predetermined amount of liquid sample is introduced into the combustion reaction section 32 through the sample introduction tube 311, and all organic carbon contained in the liquid sample is combusted to generate carbon dioxide. In this embodiment, the combustion reaction section 32 is a unique feature, and will be described in detail later.

[0044] [Dehumidifying unit 40] As shown in FIG. 2, the dehumidifying unit 40 includes a dehumidifier 41 to which the gas generated by the combustion reaction unit 30 described above is introduced, and an absorber 42 that removes corrosive gas resulting from vaporization of the acid used in the pretreatment described above from the gas that has passed through the dehumidifier 41.

[0045] 2, the gas that has passed through the dehumidifying unit 40 passes through a filter and is guided to the carbon dioxide detection unit X. The carbon dioxide detection unit X here includes a detector that detects carbon dioxide contained in the combustion gas by, for example, NDIR (non-dispersive infrared), and is provided near the control unit 50 in this example. However, the type and location of the detector are not limited to this and may be changed as appropriate.

[0046] [Control Unit 50] The control unit 50 is physically a dedicated or general-purpose computer equipped with a CPU, memory, AD converter, input / output means, etc., and functionally performs at least the function of calculating the amount and concentration of total organic carbon contained in a liquid sample based on the light intensity signal detected by the detection unit by operating in accordance with an analysis program stored in a predetermined area of ​​the memory. The control unit 50 may also have a function as a display unit that displays the amount and concentration of total organic carbon or the status of the device on a display or the like.

[0047] [Combustion Reaction Section 32] Next, the combustion reaction section 32, which is a characteristic part of the total organic carbon meter 100 of this embodiment, will be described in detail.

[0048] As shown in Figure 3, this combustion reaction section 32 comprises a combustion furnace main body 33, a vaporization member 34 housed inside the combustion furnace main body 33, a holding member 35 that holds the vaporization member 34, and a heating mechanism 36 that heats the vaporization member 34.

[0049] The combustion furnace body 33 is cylindrical, into which a liquid sample is introduced through an opening at one end and carbon dioxide is discharged from an opening at the other end. Specifically, it has a double-tube structure having an inner furnace body 331 into which the liquid sample is introduced and an outer furnace body 332 that surrounds the inner furnace body 331.

[0050] The inner furnace body 331 is made of, for example, ceramics, and is interposed between the outer furnace body 332 and the vaporizing member 34 to prevent cracks and the like caused by expansion of the outer furnace body 332 .

[0051] The outer furnace body 332 is made of, for example, ceramics, and is provided with a gap between it and the outer peripheral surface 331b of the inner furnace body 331, and is arranged so that the central axis of the outer furnace body 332 and the central axis of the inner furnace body 331 are coaxial.

[0052] The vaporizing member 34 is housed in the combustion furnace body 33 and vaporizes the liquid sample. More specifically, the vaporizing member 34 is provided inside the inner furnace body 331 and is made up of a number of granular bodies R1 and R2.

[0053] The vaporization member 34 has at least a first layer formed by laminating a certain type of granular material R1 and a second layer formed by laminating a different type of granular material R2 from the first layer. Note that the term "different types" here means having different physical properties, and more specifically, means that one or both of the physical properties and the chemical properties are different.

[0054] The vaporizing member 34 of this embodiment has a two-layer structure consisting of a first layer and a second layer, with the first layer being located on top and the second layer being located below the first layer. Note that the vaporizing member 34 may have a multi-layer structure consisting of three or more layers.

[0055] As described above, the granules R1 forming the first layer and the granules R2 forming the second layer have different physical properties, such as physical properties such as size, material, shape, hardness, true specific gravity, bulk density, thermal expansion coefficient, or thermal conductivity, specific surface area, or chemical properties such as active ingredients.

[0056] In this embodiment, the granular materials R1, R2 forming one of the first and second layers are granular catalysts that improve the vaporization efficiency of the other of the first and second layers, and examples of such catalysts include oxidation catalysts that oxidize the combustion gas produced by burning a liquid sample.

[0057] Furthermore, the granular materials R1, R2 that form the other of the first and second layers are heated to a high temperature by a heating mechanism 36 described later, thereby burning the liquid sample, and may be made of ceramics, for example.

[0058] In this way, by using a catalyst as the granules R1, R2 that form the first layer or the second layer, the heating temperature of the vaporization member 34 can be lowered, thereby improving the combustion efficiency of the liquid sample.

[0059] However, the vaporization member 34 does not necessarily have to have a layer made of a catalyst; for example, the granular material R1 forming the first layer and the granular material R2 forming the second layer may be made of ceramics of different sizes.

[0060] 3, the holding member 35 is provided below the vaporizing member 34 of the inner furnace body 331, and holds the granular material that constitutes the vaporizing member 34 in the axial center of the combustion furnace body 33. This holding member 35 is made of ceramic and has passages 35L through which gas generated from the liquid sample passes, and a specific example of this is a honeycomb plate or the like having a plurality of passages 35L.

[0061] 4, in this embodiment, the inner furnace body 331, the vaporizing member 34, and the holding member 35 are unitized and configured to be detachable as a whole from the outer furnace body 332. In order to facilitate attachment and detachment, one or more holes h are provided in the upper part of the inner furnace body 331, and other members can be hooked onto these holes h.

[0062] The heating mechanism 36 has a heater surrounding the axial center of the outer furnace body 332, and heats the vaporizing member 34 to a predetermined heating temperature (for example, 600° C. or higher).

[0063] As shown in FIGS. 3 and 4, the vaporizing member 34 of this embodiment further includes a partition member 37 interposed between the first and second layers.

[0064] This partition member 37 is interposed between the first and second layers when the vaporizing member 34 is unused, in other words, before the vaporizing member 34 is used to measure a liquid sample, and is removed from between the first and second layers when the liquid sample is measured. Note that the term "removed" here does not only mean that all of the vaporizing member 34 is removed, but also includes the case where a small amount remains as long as it does not affect the analysis results.

[0065] The partition member 37 separates the granular material R1 forming the first layer from the granular material R2 forming the second layer, and prevents these granular materials from mixing with each other.

[0066] More specifically, the partition member 37 in this embodiment is, for example, a flammable sheet or bag-like member, as shown in Figure 5, and encases at least a portion of the granular material R1 constituting the first layer that is located on the second layer side, or at least a portion of the granular material R2 constituting the second layer that is located on the first layer side.

[0067] As shown in Figures 4 and 5, the partition member 37 here encloses only a portion of the granular material R1 that constitutes the first layer that is located on the second layer side (the lower side in this embodiment), and is, for example, flammable, specifically a thin-film flammable film made of C (carbon), O (oxygen), H (hydrogen), etc.

[0068] As shown in FIG. 3, the combustion reaction section 32 of this embodiment further includes a removal mechanism 38 that removes the partition member from between the first layer and the second layer.

[0069] The removal mechanism 38 removes the partition member 37 from between the first and second layers by heating the partition member 37, for example, by heating the partition member 37 to 600° C. or higher.

[0070] In this embodiment, the above-described heating mechanism 36 also serves as the removal mechanism 38. That is, the heating mechanism 36 (removal mechanism 38) of this embodiment heats the vaporization member 34 during measurement, and also heats and removes the partition member 37 before measurement.

[0071] According to the total organic carbon meter 100 described above, the partition member 37 separates the first and second layers that make up the vaporization member 34, thereby preventing the different types of granular materials R1 and R2 from mixing at the boundary between these layers, and allowing the vaporization member 34 to exhibit the desired combustion characteristics.

[0072] Furthermore, if a metal mesh-like member is used as the vaporization member 34, a fine mesh would be required in case the granules R1 and R2 have small diameters, which could cause problems such as salt or soot from the liquid sample adhering to the mesh and clogging it.In contrast, the partition member 37 of this embodiment is a flammable film that is removed from between the first and second layers during measurement of the liquid sample, thereby solving the problems of clogging that occur when a mesh-like member is used.

[0073] Furthermore, since the apparatus is provided with a removal mechanism 38 that removes the partition member 37 from between the first and second layers, it is possible to automate the removal of the partition member 37 before measurement. Moreover, since this removal mechanism 38 is the heating mechanism 36 that heats the vaporizing member 34 when measuring a liquid sample, no dedicated mechanism or special operation for removing the partition member 37 is required, and existing device configurations and programs can be used.

[0074] In addition, since the partition member 37 encases only a portion of the granular material R1 constituting the first layer that is located on the second layer side, the encasement work time is shorter than when, for example, all of the granular material R1 constituting the first layer is encased.

[0075] Furthermore, since the inner furnace body 331 and the vaporization member 34 are unitized, it is possible to improve workability such as replacing the vaporization member 34, while preventing the different types of granular materials R1 and R2 from mixing together due to vibrations during transportation of this unitized item.

[0076] Furthermore, since the sample introduction pipe 311 is arranged to penetrate the inside of the carrier gas supply pipe 312, the internal flow path of the sample introduction pipe 311 and the internal flow path of the carrier gas supply pipe 312 can be separated, making it possible to prevent the liquid sample from drying out due to the carrier gas.

[0077] Furthermore, since the lower opening 311a of the sample introduction tube 311 is located further below the lower opening 311a of the carrier gas supply tube 312, the carrier gas is sprayed onto the liquid sample adhering to the lower opening 311a of the sample introduction tube 311, so that the desired amount of liquid sample can be supplied to the combustion reaction section 32, thereby ensuring measurement accuracy.

[0078] The present invention is not limited to the above-described embodiment.

[0079] For example, in the above embodiment, the partition member 37 envelops only a portion of the granular material R1 constituting the first layer that is located on the second layer side, but as shown in Figure 6, it may also envelop all of the granular material R1 constituting the first layer.

[0080] Furthermore, as shown in Figure 7, the partition member 37 may encase at least a portion of the granular material R2 constituting the second layer that is located on the first layer side, without encasing the granular material R1 constituting the first layer.

[0081] Furthermore, as shown in FIG. 8, the granular material R1 constituting the first layer and the granular material R2 constituting the second layer may each be enclosed by a separate partition member 37.

[0082] In addition, the partition member 37 may be made of, for example, paper or cloth, and does not necessarily have to be flammable, but may be, for example, a wire mesh.

[0083] Furthermore, the partition member 37 need only be interposed between the first layer and the second layer to separate these layers, and does not necessarily have to enclose the granular materials R1, R2.

[0084] The removal mechanism 38 is not limited to one that heats the partition member 37, but may also be one that supplies liquid to the partition member 37 to dissolve it, or one that pulls the partition member 37 out from between the first and second layers.

[0085] In addition, in the above embodiment, a carrier gas supply pipe 312 through which the sample introduction pipe 311 passes is provided, but this carrier gas supply pipe 312 does not necessarily have to be provided, and the sample introduction pipe 311 may be configured to flow carrier gas.

[0086] Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

[0087] According to the present invention, in a vaporization member formed by stacking two or more layers of different types of granular materials, it is possible to prevent the different types of granular materials from mixing with each other, thereby ensuring desired combustion characteristics.

[0088] DESCRIPTION OF SYMBOLS 100 Total organic carbon meter X Carbon dioxide detection section 10 Apparatus main body 20 Sampling unit 30 Combustion reaction unit 40 Dehumidification unit 50 Control unit 31 Sample measurement section 311 Sample introduction tube 312 Carrier gas supply tube 32 Combustion reaction section 33 Combustion furnace main body 331 Inner furnace body 332 Outer furnace body 34 Vaporization member R1 Granular material constituting the first layer R2 Granular material constituting the second layer 35 Holding member 36 Heating mechanism 37 Partition member 38 Removal mechanism

Claims

1. A total organic carbon meter for measuring total organic carbon contained in a liquid sample, comprising: a combustion reaction section for combusting all organic carbon contained in the liquid sample to generate carbon dioxide; A carbon dioxide detection unit that detects carbon dioxide generated by the combustion reaction unit, The combustion reaction section includes: A combustion furnace body; A vaporization member that is accommodated in the combustion furnace body and has at least a first layer formed by stacking granular materials and a second layer formed by stacking granular materials of a different type from the first layer; a partition member interposed between the first layer and the second layer.

2. 2. The total organic carbon meter according to claim 1, wherein the partition member is removed from between the first layer and the second layer when measuring the liquid sample.

3. 3. The total organic carbon meter according to claim 1, further comprising a removal mechanism for removing the partition member from between the first layer and the second layer.

4. 4. The total organic carbon meter according to claim 3, wherein the removal mechanism is a heating mechanism that heats the vaporizing member when the liquid sample is measured.

5. 3. The total organic carbon meter according to claim 1, wherein the partition member is a combustible film.

6. A total organic carbon meter as described in claim 1 or 2, wherein the partition member envelops at least a portion of the granular material constituting the first layer that is located on the second layer side, or at least a portion of the granular material constituting the second layer that is located on the first layer side.

7. 3. The total organic carbon meter according to claim 1, wherein one of the first layer and the second layer is made of a catalyst that improves the vaporization efficiency of the other layer.

8. The combustion furnace body is An inner furnace body and an outer furnace body surrounding the inner furnace body, 3. The total organic carbon meter according to claim 1, wherein the inner furnace body and the vaporization member are unitized and can be attached and detached together from the outer furnace body.

9. a sample introduction tube for introducing the liquid sample into the combustion reaction section from above the combustion reaction section; 3. The total organic carbon meter according to claim 1, further comprising a carrier gas supply pipe through which the sample introduction pipe passes and which supplies a carrier gas to the combustion reaction section.

10. 10. The total organic carbon meter according to claim 9, wherein the lower opening of the sample introduction tube is located lower than the lower opening of the carrier gas supply tube.

11. A combustion reaction unit used in a total organic carbon meter for measuring total organic carbon contained in a liquid sample, comprising: A combustion furnace body; A vaporization member that is accommodated in the combustion furnace body and has at least a first layer formed by stacking granular materials and a second layer formed by stacking granular materials of a different type from the first layer; a partition member interposed between the first layer and the second layer.

12. A method for measuring total organic carbon contained in a liquid sample, comprising the steps of: a combustion reaction step of combusting all organic carbon contained in the liquid sample to generate carbon dioxide; A carbon dioxide detection step of detecting carbon dioxide generated by the combustion reaction step, A combustion furnace body; A method using a vaporization member that is housed in the combustion furnace body and has at least a first layer made of layered granular material and a second layer made of layered granular material of a different type from the first layer, A method for measuring total organic carbon, comprising previously placing a partition member between the first layer and the second layer.