Gas chromatography sample thermal desorption and automatic sample injection device

A technology of gas chromatography and automatic sampling, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the extraction enrichment multiple and selectivity need to be further improved, it is difficult to enrich the target substance, and the quantification is inaccurate, etc., to achieve Fast desorption and sample injection, good reproducibility, and high separation efficiency

Inactive Publication Date: 2016-08-17
YANBIAN UNIV
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Problems solved by technology

However, there are still some deficiencies in solid-phase microextraction, which need to be further developed and improved, such as high cost, poor reliability, inaccurate quantification, and the enrichment factor and selectivity

Method used

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  • Gas chromatography sample thermal desorption and automatic sample injection device

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[0014] A gas chromatography sample thermal desorption and automatic sample injection device, which includes a micro high temperature heater 8, a sample tube 15 built in the micro high temperature heater 8, connected to the micro high temperature heater 8, and a nitrogen supply communicating with the sample tube 15. In the gas device, the two ends of the insulation tube 13 and the insulation tube 13 are respectively provided with an injection needle a9 and an injection needle b17 connected, and the injection needle a9 is inserted into the sample tube 15 whose upper port is closed. The nitrogen gas supply device is composed of a nitrogen cylinder 1, a gas supply pipe 6 with one end connected to the nitrogen cylinder 1, a safety valve 2, a pressure regulator valve 3, a pressure gauge 4, and a high-pressure solenoid valve 5 sequentially arranged on the gas supply pipeline 6. , The other end of the gas supply pipe 6 is inserted into the bottom of the sample tube 15 through the micro ...

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Abstract

The invention discloses a gas chromatography sample thermal desorption and automatic sample injection device. The device comprises a miniature high-temperature heater, a sample tube, a nitrogen supply device, a heat insulation tube, an injection needle a and an injection needle b, wherein the sample tube is arranged in the miniature high-temperature heater, the nitrogen supply device is connected with the miniature high-temperature heater and communicated with the sample tube, the injection needle a and the injection needle b are connected to the two ends of the heat insulation tube respectively, and the injection needle a is inserted in the sample tube with the upper end opening closed. The device is a gas chromatography sample pretreatment device integrating extraction, purification and separation, it is not needed to modify matched gas chromatography at all, a sample obtained after thermal desorption is directly pressed into a vaporizing chamber, and thus chromatography sample injection analysis is performed. The device is easy and convenient to operate, high in extraction rate, good in reproducibility, small in sample use quantity, high in thermal desorption and sample injection speed, high in separation efficiency and suitable for analysis of high-boiling-point ingredients of trace solids and liquid samples.

Description

technical field [0001] The invention belongs to the technical field of analytical chemical gas chromatography sample pretreatment, in particular to a gas chromatography sample thermal desorption and automatic sampling device. Background technique [0002] In the process of gas chromatography sample analysis, sample processing is a very important step. At present, there are many sample pretreatment methods, among which solid phase microextraction and liquid phase microextraction are currently the most attractive sample pretreatment technologies. Microextraction is defined as microextraction because the volume of the extraction phase is much smaller than the sample volume. Solid-phase microextraction is a fast, sensitive and convenient novel sample pretreatment technology suitable for gas and liquid samples. It almost overcomes all the shortcomings of traditional sample pretreatment methods. Low, integrating sampling extraction, concentration, and sample injection, can be use...

Claims

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Application Information

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IPC IPC(8): G01N30/12G01N30/24
CPCG01N30/12G01N30/24G01N2030/025G01N2030/125
Inventor 朴相范李东浩王洪军
Owner YANBIAN UNIV
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