JPH10300736A - Gas chromatography analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the exchange operation of a septum and to perform an analysis continuously by using a magnetic member for the wall surface of the sample injection port of a sample vaporization room and using a magnetic fluid as a sealing material. SOLUTION: A magnetic member (permanent magnet) 12 is used for the wall surface of a sample injection port 9 of a sample vaporization room 20, and a magnetic fluid 11 is used as a sealing material. A sample is analyzed by piercing an injection needle 5 through the magnetic fluid 11 whose position is fixed by the permanent magnet 12 and by injecting a sample in an injector 4 into the sample vaporization room 20. The sample is vaporized in the vaporization room 20, is carried to a carrier gas that is supplied by a carrier gas flowin port 1, is introduced into a separation column 8 and is separated, and is fed to a gas chromatography analysis device body 30 for analysis. The magnetic fluid 11 is replenished from a magnetic fluid well 13. A hole that is created when the injection needle 5 is penetrated through the magnetic fluid 11 is rapidly blocked by the diffusion of the magnetic fluid 11 after the injection needle 5 is pulled from the magnetic fluid 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas chromatography analyzer.

[0002]

2. Description of the Related Art In a sample analysis, when a sample is analyzed by a gas chromatograph analyzer, the sample is injected into a sample vaporization chamber from a sample injection port with a syringe, and is vaporized by heating in the vaporization chamber, so that carrier gas is emitted. Together with the analytical column. The sample is distributed between the liquid phase in the analytical column and the carrier gas.
After being separated for each component, it is introduced into a detection unit connected to the subsequent stage of the column, and is detected as a chromatogram.

FIG. 1 shows a sample vaporization chamber of a conventional gas chromatograph analyzer. 1 is a carrier gas inlet, 2 is a glass insert, 3 is an inlet rubber stopper called a septum, 4 is a syringe, 5 is a syringe needle, 6 is a housing, 7 is a septum holder for fixing a septum, 8 is an analytical column, 9
Is a sample inlet.

A sample is analyzed by penetrating an injection needle 5 through a septum 3 fixed by a septum retainer 7 and injecting a sample in a syringe 4 into a sample vaporization chamber. In the sample vaporization chamber, the sample is quickly vaporized, carried to the carrier gas supplied from the carrier gas inlet 1, introduced into the analysis column 8, separated and analyzed, and separated from the gas chromatograph apparatus (not shown). Sent to the detector.
The sample is made of metal (generally stainless steel) in the sample vaporization chamber
Glass insert 2 so that it does not adhere to housing 6
Is provided. The hole formed when the injection needle 5 pierces the septum 3 is drawn after the injection needle 5 is pulled out of the septum 3.
The septum 3 is closed by elastic deformation. Therefore, the sample and the carrier gas do not leak from the septum 3 and do not adversely affect the analysis.

[0005]

However, when the injection needle is pierced through the septum many times (about 40 to 60 times),
The holes formed in the septum increase in number, and eventually deteriorate so that the holes in the septum cannot be closed. for that reason,
Analysts often had to change septums.

Accordingly, an object of the present invention is to eliminate septum replacement work and to enable continuous analysis.

[0007]

In order to solve the above-mentioned problems, a gas chromatograph analyzer of the present invention is characterized in that a sample of a sample is injected by piercing a needle of a syringe from a sample inlet above a sample vaporizing chamber to vaporize the sample. In a gas chromatograph analyzer that vaporizes indoors and introduces it into a capillary column connected to the vaporization chamber for analysis, a magnetic material is used on the wall surface of the sample inlet, and a magnetic fluid is used as a seal material for the sample inlet. Is used.

Hereinafter, the operation of the gas chromatograph analyzer will be described.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a gas chromatograph analyzer according to an embodiment of the present invention, in which 20 is a sample vaporization chamber, and 30 is a gas chromatograph analyzer main body having a column oven and a detector.

1 is a carrier gas inlet, 2 is a glass insert, 4 is a syringe, 5 is a syringe needle, 6 is a housing, 8 is an analysis column, 9 is a sample inlet, 11 is a magnetic fluid, and 12 is a permanent magnet. , 13 are magnetic fluid reservoirs, and 14 is a magnetic fluid supply port.

As shown in the figure, a permanent magnet 12 is mounted around the inner wall of the sample inlet 9 and a magnetic fluid reservoir 13 for storing a magnetic fluid is provided in the housing 6.
Is formed, and the sample injection port 9 is formed from this through a flow path.
The magnetic fluid is sent to the device. Sample inlet 9
Work to fix this magnetic fluid.

Next, the analysis operation of the sample will be described. The sample analysis is performed by penetrating the injection needle 5 into the magnetic fluid 11 whose position is fixed by the permanent magnet 12, and injecting the sample in the syringe 4 into the sample vaporization chamber. In the sample vaporization chamber 20, the sample is rapidly vaporized, and the carrier gas inlet 1
Is carried into the analytical column 8 to be separated, and sent to the gas chromatograph analyzer main body 30 for analysis. Since the injection needle 5 is generally made of stainless steel having no magnetism, the magnetic fluid 11 does not adhere to the injection needle 5. The magnetic fluid 11 is supplied from the magnetic fluid reservoir 13. Further, when the amount of the magnetic fluid 11 in the magnetic fluid reservoir 13 becomes low, the analyst replenishes the magnetic fluid 11 from the magnetic fluid supply port 14. Since the internal volume of the magnetic fluid reservoir 13 is sufficiently large, the frequency of replenishment of the magnetic fluid 11 is small. The hole formed when the injection needle 5 penetrates the magnetic fluid 11 is quickly closed by the diffusion of the magnetic fluid 11 after the injection needle 5 is withdrawn from the magnetic fluid 11. Further, if the viscosity of the magnetic fluid 11 is sufficiently large and the diameter of the sample inlet 9 is small, the sample and the carrier gas in the sample vaporization chamber do not leak due to the surface tension of the magnetic fluid 11, which adversely affects the analysis. Has no effect. Therefore, as long as the sample fluid is supplied, the analysis can be continuously performed.

[0013]

As described above, in the sample vaporization chamber of the gas chromatograph apparatus of the present invention as described above, it is not necessary to replace the septum frequently, but only to replenish the magnetic fluid occasionally.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a sample vaporization chamber of a conventional gas chromatograph analyzer.

FIG. 2 is a configuration diagram of a sample vaporization chamber of a gas chromatograph analyzer according to an embodiment of the present invention.

[Description of Signs] 1: Carrier gas inflow port 4: Syringe 5: Injection needle 6: Housing 8: Analysis column 9: Sample injection port 11: Magnetic fluid 12: Permanent magnet 13: Magnetic fluid reservoir 14: Magnetic fluid supply port 20 : Sample vaporization chamber 30: Gas chromatograph analyzer

Claims (1)

[Claims] 1. A gas chromatograph for injecting a sample by piercing a syringe needle from a sample injection port above a sample vaporization chamber, vaporizing the sample in the vaporization chamber, introducing the sample into a capillary column connected to the vaporization chamber, and performing analysis. A gas chromatograph analyzer, wherein a magnetic member is used on a wall surface of a sample inlet and a magnetic fluid is used as a seal material of the sample inlet.