Gas chromatography sample thermal desorption and automatic sample injection device

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...

AI Technical Summary

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 of extraction still need to be further improved.

Regardless of the method, the enrichment rate of targets with higher boiling points (semi-volatile) is low, especially it is difficult to directly enrich targets from solid samples

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