JP5023984B2 - Multi-dimensional gas chromatograph - Google Patents

Description

  The present invention relates to a multi-dimensional gas chromatograph apparatus using a plurality of columns having different separation characteristics.

  In fields such as environmental analysis, petrochemical analysis, fragrance analysis, and food analysis, it is necessary to separate each component in a sample with a complex composition containing many kinds of trace components and perform quantitative analysis with high sensitivity. In a typical gas chromatograph (GC) apparatus, peaks of a plurality of components cannot be completely separated, and in many cases, sufficient analysis cannot be performed. In such a case, a multi-dimensional gas chromatograph apparatus (hereinafter referred to as MDGC) in which a plurality of columns having different separation characteristics are combined is very useful.

  For example, in MDGC described in Patent Documents 1 and 2, the flow path after separating the sample components by flowing the sample gas vaporized in the sample vaporization chamber to the first column is the first detector side, the second column, The two detectors branch to the two detectors. Normally (monitoring analysis), the sample gas flowing out from the first column is introduced into the first detector to detect the sample components, and the components that cannot be separated sufficiently by the first column The sample gas is selectively introduced into the second column at the timing when the sample gas containing is passed, and the separation characteristic is improved through the second column and then introduced into the second detector for detection (high resolution analysis). Do. As a result, a plurality of components that cannot be sufficiently separated in the first column and peaks are overlapped on the chromatogram can be accurately separated, and the analysis time can be prevented from becoming extremely long. .

  For switching the sample gas flow path in the MDGC as described above, as described in Patent Document 3, a flow path switching means having a structure called a Deans system is generally used. In addition, the present applicant has proposed a configuration in which typical Deans-type channel switching means is improved in Patent Documents 4 and 5. These flow path switching means have different configurations, but in any case, the flow of the switching gas supplied from the switching gas supply source is switched to change the balance of the gas pressure in the flow path, so that the flow from the first column can be changed. The switching of the flow path can be achieved so that the sample gas thus supplied flows in one of the two flow paths and the switching gas flows in the other flow path.

  In the above flow path switching means, it is preferable that the total amount of the sample component that has passed through the first column flows to the first detector or the second column and does not leak to the other flow path. However, as described above, since the flow path switching in the flow path switching means is achieved by the balance of pressure, various parameters such as column types (sizes such as inner diameter and length) and the columns are used. Analytical conditions such as the temperature of the column oven to be installed, the supply pressure of the carrier gas, the flow rate of the gas flowing through the first and second columns, the size of one or more flow resistance units (resistance tubes) included in the flow path switching means Is involved.

  Conventionally, in order to find a parameter that enables appropriate flow path switching in the flow path switching means, the analyst has to change the parameter by trial and error and perform an analysis. It was a lot of work and time-consuming work because there were many.

JP 2006-226678 A JP 2006-226679 A JP 2000-179714 A JP 2006-64646 A JP 2006-329703 A

  The present invention has been made in view of the above problems, and is intended to enable a person in charge to easily set an analysis condition (parameter) in a multi-dimensional gas chromatograph apparatus, that is, efficiently and reliably. It is aimed.

In order to solve the above problems, the present invention provides a first column that temporally separates the components in a sample gas, a flow path that detects the sample gas that has passed through the first column, and a flow toward the second column. And a flow path switching means for selectively flowing in one of the two flow paths to the container, the flow path switching means having at least one flow rate resistance unit, and from the switching gas supply source A multi-dimension that switches the flow path so that the sample gas flows in one flow path and the switching gas flows in the other flow path according to the pressure balance using the pressure drop when the supplied switching gas flows through a predetermined flow resistance section In the Jonal gas chromatograph,
a) an input means for the analyst to input at least some of the various parameters for performing the analysis;
b) Applying various parameters including parameters input by the input means to a known fluid equation for the flow rate resistance unit of the flow path switching unit to obtain the flow rate of the gas flowing through each flow rate resistance unit; Flow rate calculation means for calculating the flow rate of each gas from the path switching means toward the second column and the detector;
c) wherein among the total amount of the sample gas having passed through the first column when the sample gas having passed through the first column is a state selectively passing the flow path toward the second column by the flow path switching unit first A switching recovery rate indicating the ratio of the amount going to two columns , and the first column when the sample gas that has passed through the first column by the channel switching means is selectively passed through the channel toward the detector. Based on the flow rate calculation value by the flow rate calculation means, only one of the switching recovery rates that may not be 100% of the switching recovery rate indicating the ratio of the total amount of sample gas that has passed through to the detector. A recovery rate calculation means to calculate,
d) display means for displaying one switching recovery rate obtained by calculation by the recovery rate calculation means ;
It is characterized by having.

  When the total amount of the sample components that have passed through the first column flows to the target detector or the second column without leakage, the switching recovery rate can be 100%. In this case, if the switching recovery rate is less than 100%, it means that a part of the sample component has leaked to the other side which is not intended.

  As the channel switching means, a Deans-type channel switching device or a Deans-type improved channel switching device can be used. Specifically, for example, Patent Documents 4 and 5 propose the present applicant. A flow path switching device having a configuration can be used.

  Further, as the known fluid equation, an equation known as the Hagen-Poiseuille equation can be used.

  The various parameters for performing the analysis include, for example, the sizes of the first and second columns such as the inner diameter and length, the temperature of the column oven in which the columns are installed, the supply pressure of the carrier gas, and the switching gas. Supply pressure (or linear velocity of gas), type of carrier gas (switching gas), and the like.

  Note that if the device has a function to automatically determine the type of column to be installed, the person in charge does not need to input parameters such as the column size, but the above-mentioned input means can set such parameters. Means are also included. In general, in GC, parameters used in past analysis can be stored in a memory and recalled for use, or a predetermined default value may be used. As such, the input means also includes means for changing such called values.

  According to the MDGC according to the present invention, when a person in charge of analysis inputs parameters necessary for carrying out the analysis, the flow rate calculation means and the recovery rate calculation means are theoretically switched without executing actual analysis accordingly. The recovery rate is calculated and the result is displayed on the display means. If the parameter is changed by the input means, the displayed switching recovery rate is updated accordingly. Therefore, an analytical parameter that makes the switching recovery rate 100%, that is, the total amount of the sample components that have passed through the first column selectively flows to either the target detector or the second column. Can be found reliably in a short time. Thereby, the efficiency of analysis work can be improved. In addition, since high-resolution analysis can be reliably performed under a switching recovery rate of 100%, the target component can be detected with high sensitivity.

  Hereinafter, an embodiment of the MDGC according to the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of the MDGC according to the present embodiment, and FIG. 2 is a schematic configuration diagram of a flow path switching unit in the MDGC of the present embodiment. This flow path switching unit is a well-known typical Deans type flow path switching device.

  In the MDGC of the present embodiment, a carrier gas Gc such as helium is supplied to the sample vaporizing chamber 1 through the carrier gas channel 2 at a substantially constant flow rate, and this gas Gc is stored in the first column oven 4. Sent to column 5; In this state, when a small amount of liquid sample is injected by the injector 3 into the sample vaporizing chamber 1 heated by a heater (not shown), the liquid sample is immediately vaporized and rides on the flow of the carrier gas Gc to the first. Sent to column 5; However, in some cases, a split flow path is connected to the sample vaporizing chamber 1, most of the sample vaporized in the sample vaporizing chamber 1 is discharged through the split flow path, and only a part of the sample is sent to the first column 5. In some cases, so-called split analysis is performed. The outlet end of the first column 5 is connected to the inlet end A of the flow path switching unit 6, and the first outlet end B of the flow path switching unit 6 is connected to the first detector 7. On the other hand, the second outlet end C of the flow path switching unit 6 is connected to the inlet end of the second column 9 accommodated in the second column oven 8, and the outlet end of the second column 9 is connected to the second detector 10. Connected.

  The flow path switching unit 6 is introduced into the inlet end A by switching the flow of the switching gas Gs having the same component as the carrier gas supplied from the switching gas supply unit 11 according to the command of the analysis control unit 26, that is, the first The sample gas Ga (carrier gas Gc + sample component) that has passed through one column 5 is made to flow alternatively to one of the first detector 7 side and the second column 9 side. At this time, the switching gas Gs flows out from the outlet end B or C on which the sample gas Ga does not flow.

  Both detection signals from the first detector 7 and the second detector 10 are sent to the data processing unit 25. The data processing unit 25 creates a chromatogram based on the obtained detection signal, and performs quantitative analysis and qualitative analysis of various components by performing waveform analysis of the chromatogram. The operation of the injector 3, the flow path switching unit 6, the heater (not shown) attached to the column ovens 4 and 8, the switching gas supply unit 11, and the like are controlled by the analysis control unit 26 under the general instruction of the central control unit 20. Is done. Further, the central control unit 20 controls the analysis control unit 26 and the data processing unit 25, and receives processing results such as chromatograms from the data processing unit 25 and displays them on the display unit 24. The central control unit 20 is connected to an input unit 23 for setting various input parameters and a display unit 24 for displaying input parameters and analysis results. The entities of the central control unit 20 and the data processing unit 25 are general-purpose personal computers, and control / processing as described later is achieved by operating a predetermined control / processing program installed in the personal computer. The

  As a characteristic configuration of the MDGC of the present embodiment, the central control unit 20 includes a flow rate calculation unit 21 and a recovery rate calculation unit 22 as functional blocks. These are also processing functions realized by operating the control / processing program on the CPU of the personal computer.

  In FIG. 2, a pressure control valve 602 is installed on the switching gas supply channel 601 to which the switching gas Gs is supplied from the switching gas supply unit 11, and the end of the switching gas supply channel 601 is the inlet end of the three-way switching valve 603. connected to a. First and second switching gas branch channels 604 and 605 are connected to the two outlet ends b and c of the three-way switching valve 603, respectively, and the middle of both branch channels 604 and 605 are connected to each other via a resistance tube 606. It is connected. The three-way switching valve 603 selectively connects one of the branch flow paths 604 and 605 to the switching gas supply flow path 601 by a driving source such as a motor.

  The end of the second switching gas branch channel 605 is connected to an inlet channel 607 to which the sample gas Ga sent from the first column 5 is supplied. A first outlet channel 610 toward the first detector 7 is also connected to the inlet channel 607 in the vicinity of the connection point between the inlet channel 607 and the second switching gas branch channel 605. On the other hand, the end of the first switching gas branch flow path 604 is connected to a second outlet flow path 608 directed to the second column 9. The end portion of the inlet channel 607 and the end portion of the second outlet channel 608 that are positioned substantially in a straight line are connected by a linear communication pipe 609 in a metal block 611 formed by a joint or the like. The communication pipe 609 has a small inner diameter and can be regarded as a kind of resistance pipe. On the other hand, pipes other than the communication pipe 609 and the resistance pipe 606 such as the branch flow paths 604 and 605 have relatively large inner diameters and can be regarded as having no flow resistance.

The basic flow path switching operation of the flow path switching unit 6 will be described.
When the three-way switching valve 603 is in a state where the inlet end a and the outlet end b are in communication as shown in FIG. 2A, the switching gas supplied at a predetermined supply pressure P by the pressure control valve 602 is the first. A part flows through the resistance tube 606 from the left to the right through the one switching gas branch channel 604, and the rest enters the second outlet channel 608. When the switching gas flows through the resistance pipe 606, a pressure drop ΔP corresponding to the gas flow rate and the flow resistance is generated. Therefore, the pressure at both ends of the communication pipe 609 is about P at the left end and P−ΔP at the right end. The switching gas flows in the communication pipe 609 from the left to the right due to the pressure difference. That is, a part of the switching gas that has flowed from the first switching gas branch flow path 604 into the second outlet flow path 608 flows in the communication pipe 609 from left to right, and the rest flows through the second outlet flow path 608. It flows toward the second column 9 through. The sample gas Ga containing the sample component sent from the first column 5 merges with a small amount of switching gas flowing in through the communication pipe 609 and flows to the first detector 7 through the first outlet channel 610. .

  When the three-way switching valve 603 is in a state where the inlet end a and the outlet end c communicate with each other as shown in FIG. 2B, the switching gas supplied by the pressure control valve 602 with the predetermined supply pressure P is the second. A part flows through the resistance tube 606 from the right to the left through the switching gas branching channel 605, and the rest enters the inlet channel 607. Since the pressure drop ΔP occurs when the switching gas flows through the resistance tube 606 as described above, the pressure at both ends of the communication tube 609 is about P at the right end and P−ΔP at the left end. Due to the pressure difference, the sample gas Ga sent from the first column 5 to the inlet channel 607 flows from the right to the left in the communication pipe 609, and merges with the switching gas in the second outlet channel 608. Head to 9. The switching gas that has flowed into the inlet flow path 607 from the second switching gas branch flow path 605 flows almost directly from the first outlet flow path 610 to the first detector 7.

  In the state shown in FIG. 2A, the preferable switching in the flow path switching unit 6 is that the entire amount of the sample gas Ga sent from the first column 5 is directed to the first detector 7, and the state shown in FIG. Then, the total amount of the sample gas Ga sent from the first column 5 goes to the second column 9. Therefore, in the state of FIG. 2A, the pressure at the left end of the communication pipe 609 needs to be surely higher than the pressure at the right end. 2B, the gas pressure at the connection end of the first outlet channel 610 to the inlet channel 607 needs to be higher than the gas pressure at the right end of the communication pipe 609. Otherwise, the sample gas Ga leaks to the flow path on the opposite side, for example, the amount of the sample component to be separated and analyzed in the second column 9 is reduced, and the analysis sensitivity is lowered.

  The conditions of the gas pressure as described above are the size (inner diameter, length, etc.) of the first column 5 and the second column 9 connected to the flow path switching unit 6, the carrier gas supply pressure (or linear velocity), It is affected by various parameters such as the size (inner diameter, length, etc.) of the resistance tube 606 and the communication tube 609 and the type (mainly viscosity) of the carrier gas (switching gas). In addition, the columns 5 and 9 have a range of gas flow rates that are optimum for the separation characteristics, and the separation characteristics deteriorate if the flow rate increases or decreases beyond this range, so the variable range of these conditions is also limited. is there. For this reason, the MDGC of the present embodiment has a switching recovery rate pre-calculation function in order to appropriately set analysis conditions while making the switching recovery rate as high as possible (preferably 100%). This function will be described in detail.

  Since the person in charge of analysis needs to set various analysis conditions prior to the analysis, first, by performing a predetermined operation with the input unit 23, a setting screen 30 as shown in FIG. 3 is displayed on the screen of the display unit 24. Display. In the lower part of the setting screen 30, a first input setting unit 31 for inputting and displaying various parameters (column flow rate, column linear velocity, split ratio, etc.) related to the first column (1st GC) 5. And a second input setting unit 32 for inputting and displaying various parameters related to the second column (2nd GC) 9 (column flow rate, column linear velocity, detector pressure, etc.). . Each of the input setting units 31 and 32 can switch a setting item column by switching tabs, and is a text input column in which numerical values can be directly input for some items as illustrated in the figure. Note that the length, inner diameter, film thickness, etc. of the column are determined depending on the type of the mounted column, and cannot be changed here. If a change is desired, the column must be replaced. Further, other carrier gas supply pressure, column oven temperature, switching gas supply pressure in the flow path switching unit 6, and the like can be changed on the setting screen 30.

  The person in charge of analysis inputs an appropriate numerical value to each setting item on the setting screen 30. However, the parameters once set in this way can be stored as a method file. By specifying a method file and reading the information in that file, you can automatically enter numerical values for each setting item. You can also. It is also possible to set a default value in advance and change the numerical value appropriately after displaying the default value. As described above, various methods can be considered for the actual input of each setting item (parameter).

  When the person in charge of the analysis clicks the “OK” button 33, the input parameters are once determined, and the flow rate calculation unit 21 performs the calculation process of the flow rates f1 to f6 shown in FIG. Execute. f1 is a flow rate of gas sent from the inlet end A (sample gas Ga), f2 is a flow rate of gas sent from the second second outlet end C, f3 is a flow rate of gas passing through the communication pipe 609, and f4 is a three-way switching valve. The flow rate of the gas (switching gas) sent from the outlet end b or c of 603, f5 is the flow rate of the gas (switching gas) passing through the resistance tube 606, and f6 is the flow rate of the gas sent from the first outlet end B.

In general, the relationship among the gas flow rate, pressure, temperature, resistance tube size (inner diameter, length), gas viscosity, etc. in a certain resistance tube can be expressed by the following equation (1) based on Hagen-Poiseuille's law. Are known.
f = K · {r ⁴ / (η · L · T)} · (P1 ² −P2 ² ) (1)
Where f: flow rate of gas in the resistance tube, K: proportionality factor, r: resistance tube inner diameter, T: resistance tube temperature, η: viscosity coefficient of gas at temperature T, L: resistance tube length, P1: Gas pressure at the upstream end of the resistance tube, P2: Gas pressure at the downstream end of the resistance tube.

The outlet end of the first column 5 is connected to the inlet end A of the flow path switching unit 6, and the inlet end of the second column 9 is connected to the second outlet end C. It is a kind of resistance tube. Further, as described above, the flow path switching unit 6 includes the resistance tube 606 and the communication tube 609 as equivalent to the resistance tube. Therefore, the flow rates f1, f2, f3, and f5 can be obtained using the above equation (1). As parameters necessary for the calculation at this time, analysis parameters input and set as described above can be used. The relationship between each flow rate is
f2 = f4-f5-f3
f6 = f1 + f5 + f3
It is. Therefore, the remaining f4 and f6 can also be obtained from f1, f2, f3, and f5 obtained as described above and the above relationship.

Next, the recovery rate calculation unit 22 calculates the switching recovery rate U using one of the indexes indicating the switching performance of the flow path switching unit 6 using the flow rates f1 to f6 obtained as described above. The recovery rate U1 (%) in the case of FIG.
U1 = {(f1-f3) / f1} .100
It is. In calculation, when this value exceeds 100, it is generally expressed as 100%. As shown in FIG. 2A, when the flow rate f3 is a flow from the left to the right in the communication pipe 609, the switching recovery rate U1 is 100%. In this case, all the sample gas Ga flows to the first detector 7 and only the switching gas Gs flows to the second column 9.
On the other hand, the recovery rate U2 (%) in the case of FIG.
U2 = (f3 / f1) · 100
It is. The switching recovery rate U2 becomes 100% only when f3 = f1. In this case, all the sample gas Ga flows to the second column 9, and only the switching gas Gs flows to the first detector 7.

  The switching recovery rate calculated in this way is displayed as a numerical value in the recovery rate display field 34 in FIG. When the person in charge of analysis changes the input value of the parameter and clicks the “OK” button 33, the switching recovery rate is recalculated based on the parameter set at that time, and the recovery is performed each time. The numerical value in the rate display column 34 is updated. Therefore, the person in charge of analysis changes the input value of the parameter while confirming this numerical value, so that the switching recovery rate becomes 100% and the analysis conditions such that the gas flow rate is within the range suitable for the column can be efficiently set. Can be found.

  Basically, it is preferable to calculate and display both the switching recovery rates U1 and U2, but depending on the selection of the size of the resistance tube or column, one of the switching recovery rates U1 and U2 is always 100%. May be foreseeable, and in that case, only the recovery rate that may not be 100% may be calculated and displayed.

[Modification]
In the above-described embodiments, the present invention is applied to a typical Deans-type channel switching device. However, the present invention is applied to a channel-switching device as described in Patent Documents 4 and 5, which are modified Deans methods. You can also

  FIG. 4 is a schematic flow path configuration diagram of the flow path switching unit proposed by the present applicant in Patent Document 5. In FIG. 4, the same or corresponding components as those shown in FIG. The flow path switching unit 6 includes two resistance tubes 606 and 622 in addition to the communication tube 609. Here, the flow resistance of the first resistance tube 606 is set to a value larger than the flow resistance of the second resistance tube 622.

  When it is desired to flow the sample gas Ga to the first detector 7, the switching gas Gs is supplied at a predetermined supply pressure P with the three-way switching valve 603 switched to the output end b side. The switching gas Gs is divided in two directions at the branching portion 620, and one of the switching gas Gs passes through the second resistance tube 622. At this time, since a pressure drop ΔP1 occurs, the gas pressure P1 at the branching portion 623 corresponding to the end of the communication pipe 609 is P−ΔP1, and P1 <P is always satisfied.

  The other of the switching gas Gs divided by the branch unit 620 is supplied from the three-way switching valve 603 directly to the branch unit 625 via the branch unit 624. That is, since the switching gas Gs is supplied to the branch portion 625 without passing through the first resistance tube 606, the gas pressure in the branch portion 625 becomes equal to the switching gas supply pressure P. Therefore, the relationship between the gas pressures at both ends of the communication pipe 609 is higher on the branching part 625 side than the branching part 223, and the gas flow in the communication pipe 609 is directed from the left to the right in FIG. Thereby, the sample gas Ga merges with the switching gas Gs flowing through the communication pipe 609 and is sent out to the first detector 7 through the outlet channel 610.

In this case, assuming that the flow rate of the gas around the branching portion 620 is f11, f12, and f13 as shown in FIG. 4, f12 is obtained by the equation (1). Further, f1, f2, and f3 are also obtained from the expression (1) as in the above embodiment. The relationship between the flow rates f1 to f4 and f11 to f13 is as follows:
f11 = f12 + f13
f6 = f1 + f3 + f12
f2 = f13−f3
It is. Therefore, all the other flow rates f11 to f13 are also obtained. Thus, the switching recovery rates U1 and U2 can be calculated in the same manner as in the above embodiment.

  On the other hand, when it is desired to flow the sample gas to the second column 9, the switching gas Gs is supplied at a predetermined supply pressure P while the three-way switching valve 603 is switched to the output end c side. Also in this case, the switching gas Gs divided by the branching unit 620 is supplied to the branching unit 623 through the second resistance tube 622 in the same manner as described above. On the other hand, the switching gas Gs divided by the branching unit 620 and supplied to the three-way switching valve 603 passes through the first resistance tube 606 and is supplied to the branching unit 625 via the branching unit 624 unlike the above case. As the switching gas Gs passes through the first resistance tube 606 and the second resistance tube 622, pressure drops ΔP2 and ΔP1 occur, respectively. However, the first resistance tube 606 has a larger flow resistance than the second resistance tube 622, and thus the pressure drop. The drop is also large (ΔP2> ΔP1). Therefore, the relationship between the gas pressures at both ends of the communication pipe 609 is smaller at the branch portion 625 than at the branch portion 623. As a result, the sample gas flows from the right side to the left side through the communication pipe 609. At this time, since f13 is the flow rate of the gas flowing through the first resistance tube 606, unlike the above case, it is obtained from the equation (1). Then, all the flow rates can be obtained in the same manner as described above, and the switching recovery rates U1 and U2 can be calculated.

  Further, even when the flow path configuration is modified so that the flow path switching unit 6 includes more resistance pipes, the flow rate of the gas flowing through each resistance pipe is calculated in the same manner, and the relationship between the respective flow rates is calculated. Can also be used to determine the unknown flow rate and calculate the switching recovery rate based on it.

  The above-described embodiment is an example of the present invention, and it is a matter of course that modifications, additions, and modifications as appropriate within the scope of the present invention are included in the scope of claims of the present application.

1 is an overall configuration diagram of an MDGC according to an embodiment of the present invention. The schematic block diagram of the flow-path switching part in MDGC of a present Example. The figure which shows an example of the setting screen for inputting and setting an analysis parameter in MDGC of a present Example. The schematic block diagram of the flow-path switching part in MDGC of the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sample vaporization chamber 2 ... Carrier gas flow path 3 ... Injector 4 ... 1st column oven 5 ... 1st column 6 ... Flow path switching part 601 ... Switching gas supply flow path 602 ... Pressure control valve 603 ... Three-way switching valve 604 ... First switching gas branch flow path 605 ... Second switching gas branch flow path 606 ... Resistance pipe 607 ... Inlet flow path 608 ... Second outlet flow path 609 ... Communication pipe 610 ... First outlet flow path 611 ... Metal blocks 620, 623 , 624, 625... Branching part 622... Second resistance tube 7... First detector 8 .. second column oven 9 .. second column 10 ... second detector 11 ... switching gas supply unit 20. Calculation unit 22 ... Recovery rate calculation unit 23 ... Input unit 24 ... Display unit 25 ... Data processing unit 26 ... Analysis control unit

Claims (1)

A first column that temporally separates each component in the sample gas, and the sample gas that has passed through the first column is placed in one of the two flow paths, the flow path toward the second column and the flow path toward the detector. A flow path switching means for selectively flowing, the flow path switching means having at least one flow rate resistance unit, and when the switching gas supplied from the switching gas supply source flows through the predetermined flow rate resistance unit In the multi-dimensional gas chromatograph apparatus that switches the flow path so that the sample gas flows in one flow path and the switching gas flows in the other flow path according to the pressure balance using the pressure drop of
a) an input means for the analyst to input at least some of the various parameters for performing the analysis;
b) Applying various parameters including parameters input by the input means to a known fluid equation for the flow rate resistance unit of the flow path switching unit to obtain the flow rate of the gas flowing through each flow rate resistance unit; Flow rate calculation means for calculating the flow rate of each gas from the path switching means toward the second column and the detector;
c) wherein among the total amount of the sample gas having passed through the first column when the sample gas having passed through the first column is a state selectively passing the flow path toward the second column by the flow path switching unit first A switching recovery rate indicating the ratio of the amount going to two columns , and the first column when the sample gas that has passed through the first column by the channel switching means is selectively passed through the channel toward the detector. Based on the flow rate calculation value by the flow rate calculation means, only one of the switching recovery rates that may not be 100% of the switching recovery rate indicating the ratio of the total amount of sample gas that has passed through to the detector. A recovery rate calculation means to calculate,
d) display means for displaying one switching recovery rate obtained by calculation by the recovery rate calculation means ;
A multi-dimensional gas chromatograph apparatus comprising:

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