JPH06102262A - Sample injector for gas chromatography - Google Patents

Abstract

PURPOSE:To allow automatic injection of larger quantity of sample by replacing waste liquid Bial and cleaning solvent Bial automatically depending on analysis conditions, and to enhance accuracy in analysis by retarding contamination of the solvent. CONSTITUTION:A sample Bial 5, a waste liquid Bial 6, and a cleaning solvent Bial 7 are arranged on a table 9 and then they are sequentially transferred through a sample transfer unit 8 onto a table 4 depending on analysis conditions. Subsequently, they are injected through a microsyringe 11 and a microsyringe operating mechanism 12 into a gas chromatography 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample injection device for a gas chromatograph.

[0002]

2. Description of the Related Art A conventional device is a
Approximately two waste vials and solvent vials for washing were used to wash the microsyringe for sample collection. Therefore, the washing solvent is insufficient during the analysis.
Or, there was a problem of being contaminated. None of them have a function of automatically changing the waste liquid vial and the solvent vial for washing according to the analysis conditions.

A related device of this type is, for example, Japanese Patent Laid-Open No. 2-40561.

[0004]

The above-mentioned prior art does not take into consideration the fact that the waste liquid vial and the solvent vial for cleaning are automatically exchanged according to the analysis conditions. Out of solvent. Or, there was a problem of being contaminated.

According to the present invention, the waste liquid vial and the washing solvent vial are automatically replaced according to the analysis conditions, so that the lack of the solvent during the analysis and the deterioration of the analysis accuracy due to the contamination of the washing solvent are caused. The purpose is to prevent.

[0006]

In order to achieve the above object, a large number of waste liquid vials and solvent vials for washing are prepared in advance on a sample tray, and the vials on the sample tray are connected to the sample injection mechanism section according to the analysis conditions. I automatically replaced it with the one in use.

[0007]

By automatically exchanging the waste liquid vial and the solvent vial for washing depending on the analysis conditions, a larger amount of sample can be automatically injected. Further, since the cleaning solvent is less contaminated, the analysis accuracy can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of a sample injection device for a gas chromatograph according to the present invention, and FIG. 2 is a front view thereof.

In FIG. 1, a sample injection device for a gas chromatograph is attached to the upper part of the gas chromatograph 1. The sample injection device is composed of a sample injection mechanism section 2 and a sample supply device 3.

The sample injection mechanism section 2 has a table 4 on which about 10 vials can be arranged, and the sample supply apparatus 3 includes a sample vial 5, a waste solution vial 6, and a washing solvent vial 7. It is supplied from the table 9 by the sample transport device 8. Normally, only one sample vial 5 is arranged on the table 4, and the waste liquid vial 6 and the washing solvent vial 7 are arranged at the remaining positions. At the time of cleaning, a plurality of cleaning solvent vials 7 and a waste liquid vial 6 are used. The sample vial 5 is supplied from the sample supply device 3 each time measurement is performed, but the waste liquid vial 6 and the washing solvent vial 7 do not run short of the washing solvent or the waste liquid does not overflow depending on the analysis conditions. Are supplied from the table 9 of the sample supply device 3. Further, it may be possible to arbitrarily set the time for replacement.

Next, the injection operation will be described with reference to FIG.
First, the table 4 is rotated by the motor 10 to move the washing solvent vial 7 to below the microsyringe 11. Next, the microsyringe operating mechanism 12 lowers the needle 13 of the microsyringe 11 into the washing solvent vial 7. Next, the solvent is sucked into the microsyringe 11. The microsyringe 11 is lifted once while inhaling the solvent. When the microsyringe 11 has risen to the top dead center, the table 4 is rotated so that the waste liquid vial 6 is directly below the microsyringe 11. After the microsyringe 11 is lowered and the needle 13 is put into the waste liquid vial 6, the solvent in the microsyringe 11 is released. Although this operation is called a cleaning operation, this operation is usually repeated a plurality of times.
After the inside of the microsyringe 11 is sufficiently cleaned, the sample vial 5 is moved to directly below the microsyringe 11, and the sample is sucked into the inside of the microsyringe 11 as in the cleaning operation in the previous period. While inhaling, the micro syringe 11 is raised to the top dead center. Next, the table 4 is rotated so that the opening 14 shown in FIG. 1 is directly below the microsyringe 11. When the opening 14 comes directly below the microsyringe 11, the microsyringe 11
The microsyringe 11 is lowered until the needle 13 of (1) enters the sample injection port 15 of the gas chromatograph 1, and the sample in the microsyringe 11 is injected. After the injection, the cleaning operation in the previous term is performed again to clean the inside of the microsyringe 11.

As described in the above embodiments, according to the present invention, the solvent vial and the washing solvent vial are automatically replaced according to the analysis conditions, so that a larger amount of sample is automatically injected. It is possible to improve the efficiency of analysis. Further, since the cleaning solvent can be less contaminated, the analysis accuracy can be improved.

[0014]

According to the present invention, since a larger amount of sample can be automatically injected, the efficiency of analysis can be improved. Further, since the contamination of the washing solvent can be reduced, the analysis accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a sample injection device for a gas chromatograph according to an embodiment of the present invention.

FIG. 2 is a front view of a sample injection device for a gas chromatograph according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Gas chromatograph, 2 ... Sample injection mechanism part, 3 ... Sample supply device, 4 ... Table, 5 ... Sample vial, 6 ... Waste solution vial, 7 ... Washing solvent vial, 8 ... Sample transfer device, 9 ... Table, 10 ... motor, 11 ... microsyringe, 12 ... microsyringe operating mechanism, 13 ... needle, 14 ... opening, 15 ... sample injection port, 16 ... motor.

Claims (1)

[Claims] 1. A sample injection device for a gas chromatograph in which a liquid sample is sucked into a microsyringe having a hollow needle, and then the hollow needle is passed through a septum of a gasification chamber of a gas chromatograph to inject the sample, A sample injection device for a gas chromatograph, which is provided with a function of automatically replacing a solvent vial for cleaning a microsyringe and a waste liquid vial for temporarily storing a waste liquid with a new one according to the number of times of cleaning.