JP2021015067A - Intermediate processor for gas chromatograph and gas chromatograph - Google Patents

Abstract

To facilitate replacement of a catalyst.SOLUTION: An intermediate processor 3 for a gas chromatograph 100 includes a first gas pipe L1 to a seventh gas pipe L7, filling members 31a and 33a, and a joint 35. The filling members 31a, 33a have gas passage ports 31b, 33b, 31c, and 33c, and fills with a metal catalyst. The joint 35 connects the passage ports 31b, 33b, 31c, and 33c with the first gas pipe L1 to the seventh gas pipe L7. The joint 35 has: a first pressing section 35a provided in the passage ports 31b, 33b, 31c, and 33c; a second pressing section 35b provided in a connection portion with the passage ports 31b, 33b, 31c, and 33c among the first gas pipe L1 to the seventh gas pipe L7; and a sealing member 35c being a plate-like member and for sealing between the first pressing section 35a and the second pressing section 35b by being pressed by the first pressing section 35a and the second pressing section 35b.SELECTED DRAWING: Figure 4

Description

The present invention relates to an intermediate treatment apparatus used for a post-column reaction gas chromatograph and a post-column reaction gas chromatograph.

Conventionally, an apparatus called a "post-column reaction gas chromatograph" is known as an apparatus for measuring the concentration of a gas to be measured. The post-column reaction gas chromatograph converts the component to be measured contained in the sample gas into a gas such as methane, and measures the concentration of each component to be measured based on the concentration of the converted methane.
The above-mentioned post-column reaction gas chromatograph includes a column for separating the components to be measured, an intermediate treatment device for converting each component to be measured after separation into methane, and a device for measuring the concentration of methane (for example, a hydrogen flame ionization detector). (Flame Ionization Detector, FID)). The intermediate treatment apparatus has an oxidation catalyst that oxidizes the component to be measured and a reduction catalyst that reduces the component oxidized by the oxidation catalyst to methane.

In a post-column reaction gas chromatograph (hereinafter referred to as a gas chromatograph), the sample gas flows from the column to the intermediate treatment device, and further flows from the intermediate treatment device to the device for measuring the concentration of methane.

Japanese Unexamined Patent Publication No. 2016-156819

In the intermediate treatment apparatus, in order to make the oxidation catalyst and the reduction catalyst replaceable, the members filled with these catalysts are connected to the gas pipe of the intermediate treatment apparatus by a gas pipe joint. Conventionally, a joint having a metal ferrule has been used as a joint for gas piping. When this joint was used in the post-column reaction gas chromatograph, the member filling the catalyst could not be removed from the gas pipe, and the catalyst could not be replaced.
It is considered that this is because the metal ferrule expands in the joint when the catalyst is heated to a high temperature, and the expanded metal ferrule is firmly fixed in the joint.

An object of the present invention is to facilitate catalyst replacement in an intermediate treatment apparatus used for a gas chromatograph.

Hereinafter, a plurality of aspects will be described as means for solving the problem. These aspects can be arbitrarily combined as needed.
The intermediate processing apparatus for a gas chromatograph according to the seemingly relevant aspect of the present invention includes a gas pipe, a filling member, and a joint. The component to be measured contained in the sample gas flows through the gas pipe. The filling member is a member having a gas passage port and filled with a metal catalyst that converts a component to be measured into a predetermined derivative. The joint connects the passage port and the gas pipe.
The joint has a first pressing portion, a second pressing portion, and a sealing member. The first pressing portion is provided at the passage port. The second pressing portion is provided at the connection portion of the gas pipe with the passage port. The sealing member is a plate-shaped member, and is pressed by the first pressing portion and the second pressing portion to seal between the first pressing portion and the second pressing portion.
Therefore, even if the metal catalyst is heated, the first pressing portion and the second pressing portion constituting the joint can be separated. This facilitates catalyst replacement in the intermediate treatment apparatus.

The first surface of the first pressing portion that presses the sealing member and the second surface of the second pressing portion that presses the sealing member may be mirror-finished. As a result, the passage port of the filling member and the gas pipe of the intermediate treatment device can be well sealed.

The metal catalyst may be an oxidation catalyst used in a reaction for oxidizing a component to be measured. This facilitates the replacement of the oxidation catalyst.

The metal catalyst may be a reduction catalyst used in a reaction of reducing an intermediate produced by oxidizing a component to be measured to convert it into a predetermined derivative. This facilitates replacement of the reduction catalyst.

The metal catalyst may be heated to a temperature of 400 ° C. or higher and 600 ° C. or lower. Thereby, the reaction by the metal catalyst can be promoted.

The joint may have a first fastening member and a second fastening member. The first fastening member is provided on the passage port side. The second fastening member is provided on the gas pipe side and can be screwed into the first fastening member. At this time, the first pressing portion and the second pressing portion press the sealing member by the tightening force generated by screwing the second fastening member into the first fastening member.
This makes it possible to simplify the structure in which the sealing member is pressed by the first pressing portion and the second pressing portion.

A gas chromatograph according to another aspect of the present invention includes a column, an intermediate processing device, and an analyzer. The column separates the sample gas for each component to be measured. The intermediate processing apparatus converts each measurement target component derived from the column into a predetermined derivative. The analyzer analyzes the component to be measured based on the concentration of the predetermined derivative derived from the intermediate processing apparatus.
The above intermediate treatment device includes a gas pipe, a filling member, and a joint. The component to be measured flows through the gas pipe. The filling member has a gas passage port and is filled with a metal catalyst that converts a component to be measured into a predetermined derivative. The joint connects the passage port and the gas pipe.

Further, the above-mentioned joint has a first pressing portion, a second pressing portion, and a sealing member. The first pressing portion is provided at the passage port. The second pressing portion is provided at the connection portion of the gas pipe with the passage port. The sealing member is a plate-shaped member, and is pressed by the first pressing portion and the second pressing portion to seal between the first pressing portion and the second pressing portion. Therefore, even if the metal catalyst is heated, the first pressing portion and the second pressing portion constituting the joint can be separated. This facilitates catalyst replacement in the gas chromatograph.

In the gas chromatograph, the catalyst can be easily replaced.

The figure which shows the whole structure of the gas chromatograph which concerns on 1st Embodiment. The figure which shows the structure of the intermediate processing apparatus. The figure which shows the structure of the analyzer. The figure which shows the specific structure of a joint. The figure which shows the state of the joint at the time of connecting a gas pipe and an inlet / outlet.

1. 1. 1st Embodiment (1) Gas chromatograph Hereinafter, the gas chromatograph 100 according to the 1st embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an overall configuration of a gas chromatograph according to the first embodiment.
The gas chromatograph 100 separates each component to be measured contained in the sample gas, converts the component to be measured into a predetermined derivative, and further measures the concentration of this derivative to obtain the component to be measured contained in the sample gas. It is a device that measures the concentration.

An analysis using a gas chromatograph 100 is performed on the emission control of VOC (volatile organic compound). Here, in order to convert an electric signal relating to a component to be measured in the gas chromatograph 100 into a concentration value, a standard gas or a standard solution having a known concentration is required. The gas chromatograph 100 can be used to determine the concentration of such a standard gas or standard solution. Volatile organic compounds are, for example, hydrocarbons such as hexane (C ₆ H ₁₄ ) and pinene (C ₁₀ H ₁₆ ), and alcohols such as methanol (CH ₃ OH). Other volatile organic compounds are toluene, benzene, chlorofluorocarbons, dichloromethane and the like.

In the gas chromatograph 100 according to the first embodiment, the intermediate treatment apparatus 3 described later converts these measurement target components into a standard substance (for example, methane (CH ₄ )). In addition, the analyzer 5, which will be described later, measures the concentration of the standard substance after conversion, and measures the concentration of the component to be measured from the measurement result. As a result, the gas chromatograph 100 can measure the concentrations of various types of measurement target components using only the calibration curve of the standard substance. That is, the gas chromatograph 100 can ensure traceability for various types of measurement target components at the same time.

As shown in FIG. 1, the gas chromatograph 100 includes a column 1, an intermediate processing device 3, and an analyzer 5.
The column 1 separates the sample gas pumped from the pumping device 11 such as a pump for each component to be measured and leads the sample gas to the first gas pipe L1. The column 1 is placed in a constant temperature bath 13 such as an oven and maintained at a high temperature. The column 1 is, for example, a capillary column in which a stationary phase is applied to the inner wall of the capillary. As the stationary phase used in the column 1, a known one can be appropriately used depending on the type of the component to be measured and the like.

The intermediate treatment device 3 is arranged on the downstream side of the column 1 and on the upstream side of the analyzer 5 when considering the upstream side and the downstream side of the sample gas. Specifically, the intermediate processing device 3 is connected to the column 1 via the first gas pipe L1 and is connected to the analyzer 5 via the second gas pipe L2. The intermediate processing device 3 converts each measurement target component led out to the first gas pipe L1 into a predetermined derivative. Specifically, the intermediate treatment apparatus 3 oxidizes the component to be measured to generate a predetermined intermediate, and reduces the intermediate to generate a predetermined derivative. The intermediate is, for example, carbon dioxide (CO ₂ ). The intermediate treatment device 3 leads the gas containing the above-mentioned predetermined derivative to the second gas pipe L2. The derivative is, for example, methane (CH ₄ ).

The analyzer 5 is connected to the intermediate processing device 3 via the second gas pipe L2. The analyzer 5 measures the concentration of the component to be measured based on the concentration of a predetermined derivative contained in the gas led out to the second gas pipe L2.

(2) Intermediate Processing Device Next, a specific configuration of the intermediate processing device 3 provided in the gas chromatograph 100 according to the first embodiment will be described with reference to FIG. FIG. 2 is a diagram showing a configuration of an intermediate processing apparatus. The intermediate processing device 3 is a device that converts the measurement target component derived from the column 1 into a predetermined derivative. The intermediate treatment apparatus 3 mainly includes an oxidation catalyst 31 and a reduction catalyst 33.

The oxidation catalyst 31 is a catalyst that promotes the oxidation reaction. The oxidation catalyst 31 is a metal catalyst composed of a metal having a large valence such as palladium (Pd) and platinum (Pt). The oxidation catalyst 31 promotes a reaction in which hydrocarbons, alcohols, and other components to be measured are oxidized to generate carbon monoxide (CO), carbon dioxide (CO ₂ ), and the like as intermediates. The oxidation catalyst 31 is supported on a catalyst carrier. The catalyst carrier carrying the oxidation catalyst 31 is filled in the filling member 31a, which is a tubular member having a small diameter.

A first passage port 31b is provided at one end of the filling member 31a, and a second passage port 31c is provided at the other end. The first passage port 31b is an inlet for gas into the inside of the filling member 31a. The second passage port 31c is an outlet for gas from the inside of the filling member 31a. The first passage port 31b is connected to the first gas pipe L1 by the joint 35. On the other hand, the second passage port 31c is connected to the fourth gas pipe L4.

The first gas pipe L1 is connected to the first flow rate adjusting device 37a via the third gas pipe L3. The first flow rate adjusting device 37a is connected to the oxidation gas supply unit G1 and introduces the oxidation gas supplied from the oxidation gas supply unit G1 into the first gas pipe L1 by adjusting the flow rate. The first flow rate adjusting device 37a is, for example, a flow rate adjusting device such as a mass flow controller (MFC). The oxidation gas supply unit G1 is, for example, a cylinder filled with a gas containing oxygen such as air.

The filling member 31a can be heated by the first heating device 41. By heating the filling member 31a, the first heating device 41 heats the oxidation catalyst 31 to a temperature at which the oxidation reaction is promoted and the dew condensation of water generated by the oxidation reaction is prevented. The heating temperature of the oxidation catalyst 31 is, for example, 100 ° C. or higher and 1000 ° C. Preferably, the heating temperature of the oxidation catalyst 31 is, for example, 400 ° C. or higher and 600 ° C. or lower. More preferably, the heating temperature of the oxidation catalyst 31 is, for example, 600 ° C.

The reduction catalyst 33 is a catalyst that promotes the reduction reaction. The reduction catalyst 33 is, for example, a metal catalyst composed of nickel, ruthenium, rhodium, or the like. The reduction catalyst 33 promotes a reaction in which the above intermediate is reduced to generate, for example, methane (CH ₄ ) as a derivative. The reduction catalyst 33 is supported on a catalyst carrier. The catalyst carrier carrying the reduction catalyst 33 is filled in the filling member 33a, which is a tubular member having a small diameter.

A third passage 33b is provided at one end of the filling member 33a, and a fourth passage 33c is provided at the other end. The third passage port 33b is an inlet for gas into the inside of the filling member 33a. The fourth passage port 33c is an outlet for gas from the inside of the filling member 33a. The third passage port 33b is connected to the fifth gas pipe L5 by the joint 35. On the other hand, the fourth passage port 33c is connected to the sixth gas pipe L6 by the joint 35.

The fifth gas pipe L5 is connected to the fourth gas pipe L4 via the gas flow path switching unit 39. Further, the fourth gas pipe L4 is connected to the second flow rate adjusting device 37b via the seventh gas pipe L7. The second flow rate adjusting device 37b is connected to the reducing gas supply unit G2, and the reduced gas supplied from the reducing gas supply unit G2 is introduced into the fourth gas pipe L4 by adjusting the flow rate. The second flow rate adjusting device 37b is, for example, a flow rate adjusting device such as a mass flow controller (MFC). The reducing gas supply unit G2 is, for example, a cylinder filled with hydrogen gas.

The filling member 33a can be heated by the second heating device 43. The second heating device 43 heats the filling member 33a to a temperature at which the reduction catalyst 33 is promoted and the dew condensation of water generated by the reduction reaction is prevented. The heating temperature of the reduction catalyst 33 is, for example, 100 ° C. or higher and 1000 ° C. or lower. Preferably, the heating temperature of the reduction catalyst 33 is, for example, 400 ° C. or higher and 600 ° C. or lower. More preferably, the heating temperature of the reduction catalyst 33 is, for example, 600 ° C.

The intermediate processing device 3 of the present embodiment further includes a control unit 45. The control unit 45 is a computer system including a CPU, a storage device (RAM, ROM, SSD, hard disk, etc.), various interfaces (for example, A / D converter, D / A converter), and the like, and is an intermediate processing device 3 ( The first flow rate adjusting device 37a, the second flow rate adjusting device 37b, the first heating device 41, and the second heating device 43) are controlled. In addition, the control unit 45 may be realized by a SoC having the above configuration.
Further, the above-mentioned function of the control unit 45 is realized by a program stored in the storage device. In addition, a part or all of the functions of the control unit 45 may be realized as hardware.

The intermediate processing device 3 of the present embodiment further includes a gas flow path switching unit 39. The gas flow path switching unit 39 switches between a gas flow path in which the intermediate passes through the reduction catalyst 33 and a gas flow path in which the intermediate does not pass through the reduction catalyst 33.
The gas flow path switching unit 39 connects the fourth gas pipe L4 to the fifth gas pipe L5 and the sixth gas pipe L6 to the second gas pipe L2, so that the intermediate body passes through the reduction catalyst 33. Form a flow path. On the other hand, the gas flow path switching unit 39 connects the fourth gas pipe L4 to the second gas pipe L2 to form a gas flow path in which the intermediate does not pass through the reduction catalyst 33.

That is, the gas flow path switching unit 39 switches between introducing the derivative generated by reducing the intermediate with the reduction catalyst 33 into the analyzer 5 and introducing the intermediate directly into the analyzer 5.
The signal output from the FID device 51 when the intermediate is introduced can be used as a background signal (a signal when the measurement target component does not exist) for measuring the concentration of the measurement target component.

(3) Analytical Device Next, a specific configuration of the analyzer 5 provided in the gas chromatograph 100 according to the first embodiment will be described with reference to FIG. FIG. 3 is a diagram showing a configuration of an analyzer.
The analyzer 5 is an apparatus for measuring the concentration of the component to be measured contained in the sample gas based on the concentration of the derivative generated in the intermediate treatment apparatus 3. The analyzer 5 includes a FID device 51 and an arithmetic unit 53.

The FID device 51 is connected to the intermediate processing device 3 via the second gas pipe L2. The FID device 51 detects the derivative contained in the gas led out from the intermediate processing device 3 to the second gas pipe L2. The FID device 51 is, for example, a hydrogen flame ionization detector (FID).
More specifically, the FID device 51 is included in the gas by flowing the gas led out to the second gas pipe L2 into the hydrogen flame which is the combustion flame and measuring the ionization current ionized by the hydrogen flame. Derivatives (methane (CH ₄ )) are detected.

The arithmetic unit 53 is a computer system including a CPU, a storage device (RAM, ROM, SSD, hard disk, etc.), various interfaces (for example, A / D converter, D / A converter, etc.). In addition, the arithmetic unit 53 may be realized by a SoC having the above configuration. The functions of the arithmetic unit 53 shown below are realized by a program stored in the storage device. In addition, a part or all of the functions of the arithmetic unit 53 may be realized as hardware.
The arithmetic unit 53 controls the FID device 51, calculates the concentration of the derivative from the ionization current value measured by the FID device 51, and measures the concentration of the component to be measured in the sample gas based on the concentration of the derivative. ..

(4) Joints Hereinafter, using FIGS. 4 and 5, intermediate between the passing ports (first passing port 31b, second passing port 31c, third passing port 33b, fourth passing port 33c) of the filling members 31a and 33a. A specific configuration of the joint 35 connecting the gas pipe of the processing device 3 will be described. FIG. 4 is a diagram showing a specific configuration of the joint. FIG. 5 is a diagram showing a state of a joint when the gas pipe and the inlet / outlet are connected.
In the following, a joint 35 used for connecting the first passage port 31b and the first gas pipe L1 will be described as an example. Joints 35 at other locations have a similar configuration. The joint 35 mainly includes a first pressing portion 35a, a second pressing portion 35b, and a sealing member 35c.

The first pressing portion 35a is a metal flange-shaped member provided at the tip end portion of the first passing port 31b. The first surface 35a'that comes into contact with the sealing member 35c of the first pressing portion 35a is mirror-finished. As a result, the sealing property between the first pressing portion 35a and the sealing member 35c is improved.
The second pressing portion 35b is a metal flange-shaped member provided at the tip end portion of the first gas pipe L1. That is, the second pressing portion 35b is provided at the connection portion of the first gas pipe L1 with the first passage port 31b. The second surface 35b'that comes into contact with the sealing member 35c of the second pressing portion 35b is mirror-finished. As a result, the sealing property between the second pressing portion 35b and the sealing member 35c is improved.

The sealing member 35c is a plate-shaped metal member, and has a ring shape in which openings corresponding to the first gas pipe L1 and the first passage port 31b are formed. The sealing member 35c is arranged between the first pressing portion 35a and the second pressing portion 35b, and seals between the first pressing portion 35a and the second pressing portion 35b.

The joint 35 has a first fastening member 35d and a second fastening member 35e. The first fastening member 35d is a screw member having an opening through which the first passage port 31b penetrates and having a thread formed at the tip thereof. The second fastening member 35e is a nut member that has an opening through which the first gas pipe L1 penetrates and can be screwed into the thread of the first fastening member 35d.

As shown in FIG. 5, when the first fastening member 35d and the second fastening member 35e are screwed together, the tip of the first fastening member 35d is a third surface 35a'' (the first surface in the first pressing portion 35a). It abuts on the surface on the opposite side of 35a'). On the other hand, when the first fastening member 35d and the second fastening member 35e are screwed together, the base end portion of the second fastening member 35e is a fourth surface 35b'' (in the second pressing portion 35b, the second surface 35b' It abuts on the surface on the opposite side. The first pressing portion 35a is pushed in the direction of the second pressing portion 35b by the tightening force generated by the screwing of the second fastening member 35e and the first fastening member 35d, and the second pressing portion 35b is the first pressing portion. It is pushed in the direction of 35a. As a result, the first pressing portion 35a and the second pressing portion 35b press the sealing member 35c arranged between them.

By connecting the catalyst and the gas pipe using the joint 35 having the above configuration, in the intermediate treatment apparatus 3 according to the present embodiment, the joint 35 heated by heating the catalyst is connected to the gas inlet / outlet of the catalyst and the gas pipe. It can be prevented that it cannot be removed from. That is, in the intermediate treatment apparatus 3 according to the present embodiment, the catalyst can be easily removed from the gas pipe, so that the catalyst can be easily replaced after use.

In the intermediate treatment apparatus 3 of the present embodiment, the gas contact portion (sealing member 35c), filling member, gas passage port, and gas pipe of the joint 35 do not generate the above intermediates and derivatives such as silver or nickel. It is preferably formed of a material. This is because when intermediates and derivatives are generated in these members, an error occurs in the measurement result in the analyzer 5.

2. 2. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention. In particular, the plurality of embodiments and modifications described herein can be arbitrarily combined as needed.
(A) In the intermediate treatment apparatus 3, the gas flow path between the filling member 31a for the oxidation catalyst 31 and the filling member 33a for the reduction catalyst 33 is filled with a reactant (for example, silver (Ag)). A tubular member may be provided. Further, the tubular member and the gas pipe may be connected by using the joint 35 described in the first embodiment.
This reactant removes components (chlorine gas (Cl ₂ ), sulfur oxides) other than intermediates from the gas derived from the filling member 31a. As a result, components other than derivatives such as hydrogen chloride (HCl) and sulfuric acid (H ₂ SO ₄ ) are generated from the reduction catalyst 33, and it is possible to prevent these acidic components from flowing into the analyzer 5.

The present invention can be widely applied to intermediate treatment devices and catalysts used in post-column reaction gas chromatographs.

100 Gas chromatograph 1 Column 11 Pumping device 13 Constant temperature bath 3 Intermediate treatment device 31 Oxidation catalyst 33 Reduction catalysts 31a, 33a Filling member 31b First passage port 31c Second passage port 33b Third passage port 33c Fourth passage port 35 Joint 35a 1 Pressing portion 35a'First surface 35a'' Third surface 35b Second pressing portion 35b'Second surface 35b'' Fourth surface 35c Sealing member 35d First fastening member 35e Second fastening member 37a First flow rate adjusting device 37b 2nd flow rate adjusting device 39 Gas flow path switching unit 41 1st heating device 43 2nd heating device 45 Control unit L1 1st gas pipe L2 2nd gas pipe L3 3rd gas pipe L4 4th gas pipe L5 5th gas pipe L6 6th gas pipe L7 7th gas pipe 5 Analyzer 51 FID device 53 Computing device G1 Oxidation gas supply unit G2 Reduced gas supply unit

Claims (7)

Gas piping through which the components to be measured contained in the sample gas flow,
A filling member having a gas passage port and filled with a metal catalyst that converts the component to be measured into a predetermined derivative.
A joint for connecting the passage port and the gas pipe is provided.
The joint
The first pressing portion provided in the passage port and
A second pressing portion provided at a connection portion of the gas pipe with the passage port,
A plate-shaped member, a sealing member that seals between the first pressing portion and the second pressing portion by being pressed by the first pressing portion and the second pressing portion.
An intermediate processing device for gas chromatographs. The gas chromatograph according to claim 1, wherein the first surface of the first pressing portion that presses the sealing member and the second surface of the second pressing portion that presses the sealing member are mirror-finished. Intermediate processing equipment. The intermediate treatment apparatus for a gas chromatograph according to claim 1 or 2, wherein the metal catalyst is an oxidation catalyst used in a reaction for oxidizing the component to be measured. The gas chromatograph according to claim 1 or 2, wherein the metal catalyst is a reduction catalyst used in a reaction of reducing an intermediate produced by oxidizing the component to be measured to convert it into the predetermined derivative. Intermediate processing equipment. The intermediate treatment apparatus for a gas chromatograph according to any one of claims 1 to 4, wherein the metal catalyst is heated to a temperature of 400 ° C. or higher and 600 ° C. or lower. The joint has a first fastening member provided on the passage port side and a second fastening member provided on the gas piping side and screwable to the first fastening member.
According to any one of claims 1 to 5, the first pressing portion and the second pressing portion press the sealing member by a tightening force generated by screwing the second fastening member into the first fastening member. The intermediate processing apparatus for the gas chromatograph described. A column that separates the sample gas for each component to be measured,
An intermediate processing device that converts each measurement target component derived from the column into a predetermined derivative, and
An analyzer that analyzes the component to be measured based on the concentration of the predetermined derivative derived from the intermediate treatment apparatus, and an analyzer that analyzes the component to be measured.
With
The intermediate processing device
The gas pipe through which the component to be measured flows and
A filling member having a gas passage port and filled with a metal catalyst that converts the component to be measured into a predetermined derivative.
It has a joint that connects the passage port and the gas pipe.
The joint
The first pressing portion provided in the passage port and
A second pressing portion provided at a connection portion of the gas pipe with the passage port,
A plate-shaped member, a sealing member that seals between the first pressing portion and the second pressing portion by being pressed by the first pressing portion and the second pressing portion.
Has a gas chromatograph.

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