JPH0755783A - Gas chromatograph - Google Patents

Abstract

PURPOSE:To obtain suitable detection peak of each ingredient by one operation by previously regulating a branch flow rate of a sample to a column and regulating sensitivity of a detector in response to degree of a concentration difference even if the difference of ingredients in the sample is large. CONSTITUTION:A gas chromatograph comprises a plurality of branched sample passages 6a, 6b branched from a sample passage 6 through branch regulating means 10, columns 4, 4 connected to the passages 6a, 6b, and detectors 5, 5 connected to the columns 4, 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas chromatograph, and more particularly to a gas chromatograph capable of quantitatively analyzing each component in a single operation even if the concentration difference of the components in the sample is large.

[0002]

BACKGROUND OF THE INVENTION The gas chromatograph to which the present invention is applied has the following basic structure as shown in FIG. 1 or 2. That is, the sample introduction part 1 is connected to the vaporization chamber 2, the carrier gas supply source 7 is connected to the vaporization chamber 2, and the column 4 is connected to the vaporization chamber 2 through the sample passage 6 and the column 4 is used for detection. The part 5 is connected. In this type of gas chromatograph, the sample introduced from the sample introduction unit 1 is vaporized in the vaporization chamber 2, each component of the sample is separated and developed in the column 4 according to the flow of the carrier gas, and the gas chromatogram is recorded by the detection unit 5. Let

[0003]

2. Description of the Related Art As a conventional technique of this type of gas chromatograph, there is one shown in FIG. In this, a single column 4 and a detection unit 5 are sequentially connected to a single sample passage 6.

[0004]

In the above prior art, the following problems occur when the concentration difference of the components in the sample is large. That is, if the sensitivity of the detection unit 5 is adjusted to the low concentration side, the detection peak of the high concentration component is scaled over from the display unit and cut off. On the contrary, if the sensitivity of the detection unit 5 is adjusted to the high concentration side, the detection peak of the low concentration component becomes too low to be confirmed. For this reason, it is necessary to change the sensitivity of the detection unit 5 and perform a plurality of detection operations, which is complicated.

An object of the present invention is to provide a gas chromatograph capable of quantitatively analyzing each component in a single operation even if the concentration difference of the components in the sample is large.

[0006]

According to the present invention, as illustrated in FIG. 1, a sample introducing portion 1 is connected to a vaporization chamber 2 and a carrier gas supply source 7 is connected to the vaporization chamber 2 and the vaporization chamber 2 is connected to the vaporization chamber 2. A gas chromatograph in which the column 4 is connected to the column 2 via the sample passage 6 and the detection unit 5 is connected to the column 4 is characterized by the following.

That is, the sample passage 6 is branched into a plurality of branch sample passages 6a and 6b through the flow dividing adjusting means 10, and individual columns 4 and 4 are connected to the respective branch sample passages 6a and 6b. It is characterized in that an individual detection unit 5.5 is connected to each column 4.4.

[0008]

A concrete example of the analytical operation of a sample having two components is shown below. For example, when the component concentration is 100: 1, the partial flow rate adjusting means 10 is operated to set the ratio of the partial flow rate to each column 4 to 1: 100. The sensitivities of both detectors 5 and 5 are matched. In this case, on the column 4 side with a small partial flow,
On the chart P of the display unit 14 of the detection unit 5, the high-concentration component detection peak 17 is appropriately displayed in height. On the side of the column 4 with a large amount of divided flow, the detection peak 18 of the low concentration component is displayed at an appropriate height on the chart Q of the display unit 14 of the detection unit 5.

Also, for example, when the component concentration is 1000: 1, the ratio of the divided flow rates to the columns 4 and 4 is set to 1: 100. Further, the sensitivity of both the detectors 5 and 5 is adjusted, and the ratio of the sensitivities is set to 1:10. The sensitivity is set so that the detector 5 on the side with the smaller divided flow rate becomes smaller. In this case, on the side of the column 4 where the minute flow rate is small, the detection peak 17 of the high-concentration component is displayed in an appropriate height on the chart P of the display unit 14 of the detection unit. On the side of the column 4 with a large amount of divided flow, the detection peak 18 of the low concentration component is displayed at an appropriate height on the chart Q of the display unit 14 of the detection unit 5.

As described above, even when there is a large difference in the concentration of the components in the sample, the column 4 or 4 can be used depending on the degree of the difference in the concentration.
The appropriate detection peak of each component can be obtained by a single operation by adjusting the partial flow rate of the sample and adjusting the sensitivities of the detection units 5 and 5 in advance.

[0011]

According to the present invention, even if the concentration difference of the components in the sample is large, the partial flow rate of the sample to the column and the sensitivity of the detection unit are adjusted in advance according to the degree of the concentration difference. By setting it, an appropriate detection peak of each component can be obtained by a single operation. Therefore, the analysis operation is simplified.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic system diagram of a gas-liquid type gas chromatograph. As shown in FIG. 1, in this gas chromatograph, a sample introduction part 1 is connected to a vaporization chamber 2, a carrier gas supply source 7 is connected to the vaporization chamber 2, and a column 4 is connected to the vaporization chamber 2 via a sample passage 6. Is connected, and the detection unit 5 is connected to this column 4.

The sample introduction part 1 has a heat-resistant silicone rubber stretched over its injection port 11 and has a syringe 12 into which the sample is injected.
When you pull out, the mouth will close automatically.
A coiled heating wire 3 is wound around the outer periphery of the vaporization chamber 2 to heat and vaporize the sample.

The carrier gas supply source 7 is a flow rate adjusting valve 15
Is connected to the vaporization chamber 2 via a carrier gas passage 8 provided with. A sample passage 6 is connected to the vaporization chamber 2 and is branched into a plurality of branched sample passages 6a and 6b via a flow dividing means 10. Flow control means 10
For this, a three-way valve type needle valve with a variable diversion rate is used. Further, individual columns 4 and 4 are connected to the respective branch sample passages 6a and 6b. This each column 4
4 is housed in a temperature-controlled room 13 with a carrier filled inside.

Individual detectors 5 and 5 are connected to the columns 4 and 4, respectively. Each of the detection units 5 and 5 includes a detector 16 and a display unit 14, respectively. Detector 16
Then, the component flowing out from the column 4 is detected by comparison with the carrier gas, and the display unit 14 displays the detected component.

The contents of the embodiment of the present invention are as described above, but the present invention is not limited to the above embodiment. For example, the sample passage 6 may be branched into three or more branched sample passages, and the individual column 4 and the detection unit 5 may be connected to each of them. Further, the present invention may be a gas-solid chromatograph. In a gas-liquid chromatograph,
As the stationary phase of the column 4, an inert solid carrier such as diatomaceous earth or crushed refractory brick impregnated with a low volatile liquid such as paraffin oil is used. In the gas-solid chromatograph, silica gel, activated alumina or the like is used. Use an adsorbent.

In addition, the detection unit 5 uses various detection methods such as a heat conduction method, a hydrogen flame ionization method, a thermoionization method, and a flame photometric detection method to display electric signals and light intensity information as a gas chromatogram on the display section. Use the device shown.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of a gas-liquid type gas chromatograph showing an example.

FIG. 2 is a view equivalent to FIG. 1 showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sample introduction part, 2 ... Vaporization chamber, 4 ... Column, 5 ... Detection part, 6 ... Sample passage, 6a * 6a ... Branch sample passage, 7 ... Carrier gas supply source, 10 ... Minute flow rate adjusting means.

Claims (1)

[Claims] 1. A sample introduction part (1) is connected to a vaporization chamber (2),
A carrier gas supply source (7) is connected to the vaporization chamber (2), and a column (4) is connected to the vaporization chamber (2) through a sample passage (6).
In the gas chromatograph in which the column (4) is connected to the column (4) and the detector (5) is connected to the column (4), the sample passage (6) is divided into a plurality of branch sample passages (6a) and (6b) through the diversion adjusting means (10). To each of the branched sample passages (6a) and (6b).
(4) is connected, and each column (4) ・ (4) has an individual detector.
(5) -A gas chromatograph characterized in that (5) is connected.