JP2009236588A - Sample gas collecting device and gas chromatograph device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To send high-concentration sample gas, in a short time, by adsorbing the sample gas uniformly, and by preventing re-adsorption of desorbed sample gas. <P>SOLUTION: In this sample gas collection device 1, having a hollow member 11 having an introduction port 11a for introducing the sample gas and an exhaust port 15a for exhausting the introduced sample gas; a collection agent 12, stored in the hollow member 11 for collecting the sample gas; and a heating means 13 for desorbing the sample gas collected by the collection agent 12 by heating the hollow member 11, for collecting the sample gas introduced into the hollow member 11 by the collection agent 12 in a low-temperature state, and desorbing the sample gas collected by the collection agent 12 in a high-temperature state, the collection agent 12 is formed in a shape where the distance from a place where the sample gas introduced from the introduction port 11a is collected uniformly and the collected sample gas is desorbed to the exhaust port 15a is substantially uniform, and the hollow member 11 is formed in a shape storing the collection agent 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sample gas collecting apparatus and a gas chromatograph apparatus having a collecting agent that collects an introduced sample gas at a low temperature and desorbs the collected sample gas at a high temperature. It is.

  A gas chromatograph apparatus (hereinafter referred to as a GC apparatus) is an apparatus used for detecting a component to be detected such as a volatile organic compound contained in a sample gas such as the atmosphere. Therefore, in addition to a detection device such as a separation column and a detection sensor, a configuration including a collection device for collecting and concentrating a detection target component is generally used.

  As shown in FIG. 9, the GC apparatus 100 proposed in Patent Document 1 includes a carrier gas source 108 such as a gas cylinder that generates a carrier gas for transporting a sample gas component, and a component of the sample gas transported by the carrier gas. , A sample introduction port 101 for introducing a sample gas, a suction pump 104 for sucking the sample gas introduced from the sample introduction port 101 and discharging it from the discharge port 115, and a component to be detected from the sample gas And a valve 105 for selectively connecting the collection tube 102 between the sample inlet 101 and the suction pump 104 or between the carrier gas source 108 and the analyzer 110. , Etc.

  In the GC apparatus 100, when collecting (concentrating) the detection target component, the valve 105 is switched so that the collection tube 102 is connected in series between the sample introduction port 101 and the suction pump 104, and the suction pump 104 is collected. As the sample gas is sucked, the sample gas introduced into the sample introduction port 101 flows in the collection tube 102 and the detection target component is collected. When detecting the component to be detected, the valve 105 is switched so that the collection tube 102 is connected in series between the carrier gas source 108 and the analyzer 110, and the carrier gas source 108 generates carrier gas. Then, the component to be detected is transported from the collection tube 102 to the analysis device 110 by the carrier gas, and introduced into the analysis device 110 by flowing in the collection tube 102.

In addition, the collecting tube shown in Patent Document 2 is a connecting portion that can reduce the dead volume by inserting a sealing material into a connecting portion where rapid heating and heating cannot be performed, and can uniformly heat the filler. In other parts, re-adsorption is prevented and analysis performance can be improved and stabilized.
JP 2006-337158 A JP-A-9-113493

  However, the conventional collection tube as described above is cooled to a temperature sufficient to adsorb the sample gas to the collection agent in the collection tube by the cooling means, and then vaporizes the sample gas adsorbed to the collection agent. By heating with heating means above the temperature, desorption of the sample gas is promoted and sent to the analyzer together with the carrier gas. However, time distribution occurs in the desorbed gas concentration at the time of heating and desorption. There was a problem that the analysis peak was broad (broad) and it was difficult to obtain an abrupt analysis peak.

  Further, since the adsorbent is provided over a predetermined range in the flow direction of the carrier gas, it is difficult to uniformly adsorb the sample gas, and the sample gas desorbed upstream in the flow direction is the carrier gas. However, there is a problem that it may flow downstream and re-adsorb.

  Therefore, in view of the above-described problems, the present invention provides a sample gas collecting device that uniformly adsorbs a sample gas and prevents re-adsorption of the desorbed sample gas and delivers a high concentration sample gas in a short time, and It is an object to provide a gas chromatograph apparatus.

  In order to solve the above problems, the sample gas collecting device according to claim 1 made in accordance with the present invention comprises an introduction port for introducing a sample gas, a hollow member having an exhaust port for exhausting the introduced sample gas, and the hollow A collecting agent that is contained in a cylindrical member and collects the sample gas, and a heating unit that heats the hollow member and brings the sample gas collected in the collecting agent into a high temperature state. A sample gas collecting device that collects the sample gas introduced into the hollow member in the low temperature state and collects the sample gas collected in the collection agent in the high temperature state In the above, the collection agent is formed in a shape that uniformly collects the sample gas introduced from the introduction port and has a substantially uniform distance to the exhaust port after desorbing the collected sample gas, The hollow member is formed in a shape that accommodates the scavenger. It is characterized in.

  The invention according to claim 2 is the sample gas collecting device according to claim 1, wherein the collecting agent is formed in a hollow hemispherical shape.

  The invention according to claim 3 is the sample gas collecting device according to claim 1 or 2, wherein the sample gas collecting device is accommodated in the hollow member so as to be interposed between the collecting agent and the exhaust port, and the collecting agent. And a non-adsorbent that prevents re-adsorption of the sample gas desorbed from the sample gas.

  The gas chromatograph apparatus according to claim 4 made in accordance with the present invention in order to solve the above-described problems is the sample gas collecting apparatus 1 according to any one of claims 1 to 3 and the sample gas collecting apparatus 1. And analyzing means 5 for analyzing the components of the desorbed sample gas.

  As described above, according to the sample gas collecting device of the present invention described in claim 1, the sample gas introduced from the introduction port of the hollow member is uniformly collected and the collected sample gas is desorbed. Since the trapping agent is formed so that the distance from the exhaust port to the exhaust port is substantially uniform and accommodated in the hollow member, the introduced sample gas can be uniformly collected and the sample gas desorbed from the sample gas. Can be discharged from the exhaust port at once, so that a high-concentration sample gas can be delivered in a short time. Further, since there is no collecting agent between the collecting agent and the exhaust port, it is possible to prevent resorption of the desorbed sample gas. Therefore, by using the sample gas collecting device of the present invention, a sharp peak with a high resolution can be obtained.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the collecting agent is formed in a hollow hemisphere, the contact area between the sample gas and the collecting agent is increased. Since the distance from the entire region of the collection agent to the exhaust port can be made equal, the concentration rate can be improved and the decrease in the concentration rate due to re-adsorption can be prevented.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the non-adsorbent is accommodated in the hollow member so as to be interposed between the collecting agent and the exhaust port. As a result, the sample gas desorbed from the collection agent can be prevented from being re-adsorbed and discharged from the exhaust port at once, so that a high-concentration sample gas can be delivered in a shorter time.

  As described above, according to the gas chromatograph device of the present invention described in claim 4, since the sample gas collecting device that can shorten the time distribution of the desorbed gas concentration at the time of thermal desorption is provided, Since the sample gas collecting device can send the sample gas to the analyzing means in a short time, and the analyzing means can obtain a sudden detection peak, the gas component can be analyzed efficiently.

  Hereinafter, an embodiment of a sample gas collecting device and a gas chromatograph (GC) device having the sample gas collecting device according to the present invention will be described with reference to the drawings of FIGS.

  In FIG. 1, the sample gas collection device 1 has a hollow member 11, a collection agent 12, a cooling and heating means 13, a non-adsorbent 14, a sealing case 15, and a sealing mesh 16. And are integrally formed. In addition, although this embodiment demonstrates the case where the hollow member 11 and the sealing case 15 are made into a different body, they can also be made into an integral case.

  The hollow member 11 is formed of a heat conductive member in a hollow hemispherical shape. The hollow member 11 has an introduction port 11a formed in the vicinity of a hemispherical apex, and has a structure in which sample gas, carrier gas, and the like are introduced into the inside from the introduction port 11a. In this embodiment, the case where one introduction port 11a is provided will be described. However, the present invention is not limited to this, and a plurality of introduction portions are provided on the surface of the sphere so that sample gas, carrier gas, etc. It can be set as various embodiments, such as introduce | transducing inside.

  The trapping agent 12 is a hollow hemisphere that is slightly smaller than the hollow member 11 described above by a member that adsorbs a sample gas, for example, a membrane material that adsorbs and collects gas molecules such as TENAX, activated carbon, and zeolite. Is formed. And the collection agent 12 is formed in the hemisphere of the predetermined radius centering on the exhaust port 15a of the sealing case 15 mentioned later. By adopting such a semi-vacuum shape, the sample gas introduced from the introduction port 11a is uniformly collected, and the distance from the collected sample gas to the exhaust port 15a is made substantially uniform. The collector 12 adsorbs and collects the sample gas flowing in the hollow member 11 in a low temperature state. Then, the collected sample gas is desorbed by being heated to a high temperature state at or above the vaporization temperature.

  The cooling and heating means 13 corresponds to the heating means in the claims, is provided along the outer peripheral surface of the hollow member 11, and a known cooling device such as a cooler and a heating device such as a heater are used. The cooling device and the heating device are switched between cooling and heating by external control. The cooling and heating means 13 promotes cooling or heating of the collection agent 12 described above by cooling or heating the hollow member 11.

  As the non-adsorbent 14, a material such as α-alumina, a metal or glass that has been subjected to an inert treatment is used, which has a low adsorptivity of the sample gas desorbed from the collection agent 12. Then, the space generated between the collection agent 12 and the sealing case 15 is filled. In addition, this non-adsorbent 14 can also be deleted from the structure of the sample gas collection apparatus 1, when unnecessary.

  The sealing case 15 is made of the same material as the hollow member 11 and is formed in a substantially disk shape that closes the opening of the hollow member 11. The sealing case 15 has an exhaust port 15a, a fitting convex portion 15b, a locking portion 15c, and an attachment portion 15d.

  The exhaust port 15a protrudes outward from the vicinity of the center of the main body of the sealing case 15 and is formed in a pipe shape for exhausting the sample gas (desorption gas) introduced into the hollow member 11. The fitting convex portion 15b is formed in a ring convex shape along the circumferential portion of the sealing case 15, and is fitted into the opening of the hollow member 11 to seal the inside. The locking portion 15c is formed in a ring convex shape protruding toward the hollow member 11 so as to engage and fix the first and second meshes 16a and 16b. The mounting portion 15d is formed in a ring convex shape that protrudes into the hollow member 11 around the exhaust port 15a.

  The sealing mesh 16 includes a first mesh 16a, a second mesh 16b, and a third mesh 16c, each of which is formed in a hollow hemispherical shape by various mesh members capable of passing (penetrating) a sample gas or the like. ing. The first mesh 16 a is formed in a hollow hemisphere slightly smaller than the hollow member 11 so as to form a predetermined gap S between the first mesh 16 a and the hollow member 11. And it positions so that the clearance gap S may be formed by the some convex part 11b which protrudes from the inner surface of the said hollow-shaped member 11. FIG.

  The second mesh 16b is formed in a hollow hemisphere that is slightly smaller than the first mesh 16a so that the scavenger 12 can be accommodated between the second mesh 16b and the first mesh 16a. That is, when the first mesh 16a and the second mesh 16b are locked and fixed to the locking portion 15c of the sealing case 15, the collecting agent is formed by the inner surface of the first mesh 16a and the outer surface of the second mesh 16b. 12 is sandwiched.

  The 3rd mesh 16c is formed in the hollow hemisphere considerably smaller than the 2nd mesh 16b so that the non-adsorbent 14 can be accommodated between the 2nd mesh 16b. That is, when the third mesh 16c is attached to the attachment portion 15d of the sealing case 15, the non-adsorbent 14 is sandwiched between the inner surface of the second mesh 16b and the outer surface of the third mesh 16c.

  The sample gas collecting device 1 configured as described above is assembled as follows. First, the 1st mesh 16a is arrange | positioned in the hollow-shaped member 11, the scavenger 12 is arrange | positioned there, and it pinches | interposes with the 2nd mesh 16b. After the non-adsorbent 14 is filled, the sealing case 15 to which the third mesh 16c is attached is fitted close to the opening of the hollow member 11 and assembled.

  When the sample gas is introduced from the inlet 11a in a state where the inside of the hollow member 11 is cooled by the cooling and heating means 13, the sample gas collecting device 1 assembled in this way The sample gas is collected in the collection agent 12 through the gap S between the first mesh 16a. And since the collection agent 12 is formed in the thin film shape, it is uniformly collected by all the hemispherical surfaces formed in the hemispherical shape.

  When the inside of the hollow member 11 is heated by the cooling and heating means 13 above the vaporization temperature of the sample gas adsorbed on the collection agent 12 in accordance with the end of collection (adsorption) of the sample gas by the collection agent 12. The detachment of the sample gas from the collecting agent 12 is promoted. Then, the desorbed sample gas passes through the non-adsorption portion 14 together with the carrier gas introduced from the introduction portion 11a and is sent to the outside from the exhaust port 15a.

  FIG. 2 shows a comparison result of the desorption characteristics of the sample gas collecting device 1 of the present invention and a conventional cylindrical collecting tube (see FIG. 9) that is long in the flow direction of the sample gas. The experimental condition is that the sample gas is collected by cooling for a predetermined cooling time, and then heated for a predetermined heating time to desorb the sample gas, which is provided downstream of each member. The condition is that the concentration is measured by the gas sensor.

  The desorption characteristic of the present invention shown in FIG. 2 (a) indicates that a high concentration of sample gas was detected while the desorption time was short. On the other hand, the conventional desorption characteristic shown in FIG. 2B indicates that a low concentration of sample gas was detected while the desorption time was long. As described above, it was confirmed that the high concentration sample gas can be delivered in a short time by adopting the structure of the present invention.

  According to the sample gas collecting apparatus 1 of the present invention described above, the sample gas introduced from the introduction port 11a of the hollow member 11 is uniformly collected, and the collected sample gas is desorbed, and then the exhaust port 15a. Since the trapping agent 12 is formed so as to have a substantially uniform distance to be accommodated in the hollow member 11, the introduced sample gas can be collected uniformly and the desorbed sample gas can be collected all at once. Since the gas can be discharged from the exhaust port 15a, a high-concentration sample gas can be sent out in a short time. Moreover, since the collection agent 12 does not exist between the collection agent 12 and the exhaust port 15a, it is possible to prevent resorption of the desorbed sample gas. Therefore, by using the sample gas collecting device 1 of the present invention, a sharp peak with a high resolution can be obtained.

  In addition, since the collecting agent 12 is formed in a hollow hemispherical shape, the contact area between the sample gas and the collecting agent 12 can be increased, and from all regions of the collecting agent 12 to the exhaust port. Therefore, the concentration rate can be improved and a decrease in the concentration rate due to re-adsorption can be prevented.

  Further, since the non-adsorbing agent 14 is accommodated in the hollow member 11 so as to be interposed between the collecting agent 12 and the exhaust port 15a, re-adsorption of the sample gas desorbed from the collecting agent 12 is prevented. Since the gas can be discharged from the exhaust port 15a at once, a high concentration sample gas can be sent out in a shorter time.

  In the above-described embodiment, the case where the collecting agent 12 is formed in a hemispherical shape has been described. However, the present invention is not limited to this, and the sample gas introduced from the introduction port 11a is uniformly collected and As long as the distance from the collected sample gas to the exhaust port 15a is substantially uniform, for example, the collector 12 has a substantially fan-shaped or arc-shaped cross section with respect to the flow direction of the sample gas. Various embodiments such as a hollow box shape can be used.

  Moreover, although embodiment mentioned above demonstrated the case where the hollow member 11 and the collection agent 12 were formed in the same hollow hemisphere, this invention is not limited to this, The shape of the hollow member 11 It is not necessary to match the shape of the collecting agent 12.

  Next, the gas chromatograph apparatus 3 incorporating the sample gas collection apparatus 1 described above will be described with reference to the drawings of FIGS.

  3-7, the gas chromatograph apparatus (henceforth GC apparatus) 3 has the sample gas collection apparatus 1, the activated carbon filter 4, the analysis means 5, the buffer 6, and the pump 7 which were mentioned above. These are sequentially incorporated into the component detection path R.

  The component detection path R includes a flow path R1 that connects the sample gas collection device 1 and the activated carbon filter 4, a flow path R2 that connects the sample gas collection device 1 and the analysis means 5, an analysis means 5 and a buffer 6. And a bypass path R4 for connecting the activated carbon filter 4 and the analysis means 5 to each other.

  The activated carbon filter 4 sucks the atmosphere from the atmosphere port, removes impurities contained in the atmosphere by the activated carbon in the filter, and generates a carrier gas.

  Although not shown, the analysis means 5 has a column and a gas sensor. As the column, a known separation column of a gas chromatograph or the like is used. The column is heated by the heater, and the sample gas introduced from the flow path R2 is separated and sent on the time axis (predetermined measurement period) according to the type (measurement target component).

  As the gas sensor, a contact combustion type gas sensor, an adsorption combustion type gas sensor, or the like is used. For example, based on a resistance difference between the sensitive element part and the sensitive element part, a sensor signal indicating the gas concentration is output to a control part (not shown).

  The control unit is electrically connected to the three-way valves V1 and V2, the analysis unit 5, the flow unit 7 and the like, and performs each control. The control unit obtains sensor outputs from the gas sensors at predetermined sampling intervals, and calculates the concentration of each separated gas obtained by separating the sample gas by the column based on the sensor outputs, thereby analyzing the sample gas. To do.

  The buffer 6 is an existing one for suppressing the flow disturbance caused by the pump 7 and keeping the flow amount constant. By providing the buffer 6, the flow amount is stabilized, so that the detection accuracy can be improved. Further, the buffer 6 may be omitted if the error due to the disturbance of the flow of the pump 7 is within an allowable range. The pump 7 discharges the gas sucked from the pump suction port 7a from the pump discharge port 7b to flow the sample gas or the like in the component detection path R.

  The three-way valve V1 is provided in the flow path R1. The three-way valve V1 includes three ports a, b, and c. The activated carbon filter 4 is connected to the port a, the intake / exhaust port 8 is connected to the port b, and the sample gas collecting device 1 is connected to the port c. Yes. The three-way valve V1 connects the sample gas collector 1 and the intake / exhaust port 8 according to the introduction of the sample gas (bc connection), and according to the introduction of the carrier gas, the activated carbon filter 4 and the sample gas trap. The collector 1 is connected (ac connection).

  The three-way valve V2 is provided in the flow path R2. The three-way valve V <b> 2 is provided at the end of the bypass path R <b> 4 located between the sample gas collection device 1 and the analysis means 5. In addition, three ports a, b, c are provided, the port a is an end of the sample gas collecting device 1 located on the analysis means 5 side, the port b is a bypass path R4, the port c is the analysis means 5, Are connected to each other. The three-way valve V2 selects and switches either the sample gas collection device 1 or the bypass route R4 as a route for flowing the carrier gas. That is, the sample gas collecting device 1 and the analyzing means 5 (ac connection) or the bypass path R4 and the analyzing means 5 (bc connection) are selectively connected.

  Next, an example of the operation (action) according to the present invention of the gas chromatograph (GC) apparatus 1 will be described with reference to the schematic operation diagrams of FIGS. 3 to 7 and the flowchart shown in FIG.

  When the gas chromatograph apparatus 1 is activated by turning on the power, both the three-way valves V1 and V2 are connected between the ports ac, and the cooling and heating means 13 of the sample gas collecting apparatus 1 is brought into a heating state. Then, the flow of the carrier gas is started by driving the pump 7. As a result, the carrier gas flows so as to pass through the column of the sample gas collecting device 1 and the analyzing means 5, and the desorbed impure components are discharged out of the GC device 1 by the carrier gas (see FIG. 3 above). Cleaning 1 operation). Then, after discharging the impure components is completed, the process proceeds to step S120.

  In step S120, the cooling and heating means 13 of the sample gas collecting apparatus 1 is brought into a cooling state. In step S130, the three-way valve V1 is connected between the ports b and c, the three-way valve V2 is connected between the ports ac and the sample gas is collected by driving the pump 7 over a predetermined time. The sample gas is collected (adsorbed) by the collection agent 12 of the sample gas collection device 1 by flowing in (refer to FIG. 4, sampling operation). And after collection of sample gas is completed, it progresses to Step S140.

  Note that the amount of sample gas collected by the collection agent 12 is determined by the flow rate and period of the sample gas, and the amount of collection increases as the flow rate increases. Based on the above, the collection agent 12 is set so as not to be destroyed.

  In step S140, the three-way valve V2 is connected between the ports bc, and the analysis means 5 and the like are purged with the carrier gas by driving the pump 7, so that the impure components are discharged out of the GC apparatus 1 by the carrier gas ( (See FIG. 5, cleaning 2 operation). Then, after discharging the impure components is completed, the process proceeds to step S150.

  In step S150, the three-way valves V1 and V2 are both connected between the ports bc, the cooling and heating means 13 of the sample gas collecting apparatus 1 is brought into a heating state, the column is brought into a heating state, and the pump 7 is driven. The carrier gas is caused to flow in the component detection path R. (See FIG. 6, Desorption 1 operation). Then, after the desorption is completed, the process proceeds to step S160.

  In step S160, the cooling and heating means 13 of the sample gas collecting apparatus 1 and the respective states of the column are maintained, and the port of the three-way valve V1 is switched between (bc) and (ac) and connected. The three-way valve V2 is temporarily connected between the ports (ac), and the desorbed gas in the sample gas collecting device 1 is sent to the analyzing means 5 (implanted). Then, the three-way valve V2 is connected between the ports (b-c), and this state is maintained until the analysis by the analysis means 5 is completed.

  Thereby, the high-concentration sample gas desorbed and staying in the sample gas collecting apparatus 1 is discharged (introduced) to the analysis means 5 (that is, the column) by the air sucked from the intake / exhaust port 8. The Then, after a high-concentration sample gas is introduced into the column, the column is heated to a high temperature suitable for sample gas component separation. As a result, the sample gas components contained in the sample gas introduced into the column are separated, and each sample gas component is conveyed to the gas sensor of the analysis means 5 with a time difference by the carrier gas, and each component is detected. (Refer to FIG. 7 above, desorption 2 and analysis operation). When the analysis ends, the process returns to step S110 and a series of processes is repeated.

  According to the gas chromatograph apparatus 3 of the present invention described above, the sample gas collecting apparatus 1 has the sample gas collecting apparatus 1 in which the time distribution of the desorbed gas concentration during the heat desorption is shortened. Can send the sample gas to the separation and analysis means 5 in a short time, and the separation and analysis means 5 can obtain an abrupt detection peak, so that the gas components can be analyzed efficiently.

  In step S160 described above, the case where the sample gas collecting device 1 and the activated carbon filter 4 are connected by connecting the port of the three-way valve V1 between (ac) has been described. The port of the three-way valve V1 is connected between (bc) and connected to the sample gas collection device 1 and the intake / exhaust port 8, and the desorbed gas in the sample gas collection device 1 is not limited thereto. Can be sent to the analysis means 5.

  Moreover, each embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a cross-sectional schematic diagram which shows schematic structure of the sample gas collection apparatus of this invention. It is a graph which shows the detachment | desorption characteristic of the sample gas collection device of this invention, and the conventional collection tube, (a) is a thing of the sample gas collection device of this invention, (b) is a thing of the conventional collection tube Respectively. It is a block diagram which shows schematic structure which concerns on the cleaning 1 of the gas chromatograph apparatus of this invention. It is a block diagram which shows schematic structure which concerns on the sampling of the gas chromatograph apparatus of this invention. It is a block diagram which shows schematic structure which concerns on the cleaning 2 of the gas chromatograph apparatus of this invention. It is a block diagram showing a schematic structure concerning desorption 1 of a gas chromatograph device of the present invention. It is a block diagram which shows the schematic structure which concerns on the detachment | desorption 2 and analysis of the gas chromatograph apparatus of this invention. It is a flowchart which shows an example of the process outline | summary of the gas chromatograph apparatus of this invention. It is a block diagram of the conventional gas chromatograph apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sample gas collection apparatus 3 Gas chromatograph apparatus 11 Hollow member 11a Inlet 12 Collection agent 13 Heating means (cooling heating means)
14 Non-adsorbent 15a Exhaust port

Claims (4)

A hollow member having an introduction port for introducing a sample gas, an exhaust port for exhausting the introduced sample gas, a collecting agent that is contained in the hollow member and collects the sample gas, and the hollow member. Heating means for desorbing the sample gas collected in the collection agent to a high temperature state, and the sample gas introduced into the hollow member is captured by the collection agent in a low temperature state. In the sample gas collection device for collecting and desorbing the sample gas collected in the collection agent in a high temperature state,
The collection agent is formed in a shape that uniformly collects the sample gas introduced from the introduction port and has a substantially uniform distance from the desorption of the collected sample gas to the exhaust port,
The sample gas collecting apparatus, wherein the hollow member is formed in a shape for accommodating the collecting agent.   The sample gas collecting apparatus according to claim 1, wherein the collecting agent is formed in a hollow hemispherical shape.   A non-adsorbing agent that prevents re-adsorption of the sample gas accommodated in the hollow member and desorbed from the collecting agent so as to be interposed between the collecting agent and the exhaust port is provided. Item 3. The sample gas collector according to Item 1 or 2.   A gas chromatograph comprising: the sample gas collecting device according to any one of claims 1 to 3; and an analysis unit that analyzes a component of the sample gas desorbed by the sample gas collecting device. apparatus.

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