Thermal desorption device

Abstract

The invention relates to the technical field of sample detection and discloses a thermal desorption device combined with a gas chromatograph. The thermal desorption device is mainly used for thermal desorption of a solid phase micro-extraction rod, a solid phase micro-extraction stirring bar, a cluster capillary solid-phase micro-extraction pipe and a filling adsorption column and realizes fast desorption of a trace quantity of an adsorbed and enriched ingredient. The thermal desorption device comprises a heating pipe, a lining pipe, a seal ring, a lining pipe pressure cap, a lining pipe base, a lining pipe base heat-insulation ring, a desorption device pedestal, a sample transmission pipe, a desorption purge gas circuit, a desorption shunting gas circuit, a heating wire and a temperature control element. A sample ingredient is subjected to thermal desorption in the lining pipe, and the sample transmission pipe is heated by the heating pipe and thermal conduction of an upper cap of a gas chromatogram sample injector and is subjected to heat insulation by the lining pipe base heat-insulation ring. When a desorption temperature is 300 DEG C, the thermal desorption device has a desorption residual rate less than 0.1% of the ingredient at a boiling point less than 430 DEG C. The thermal desorption device has the advantages of no cold zone of a desorption sample channel, fast heating rate and low power consumption.

Description

technical field [0001] The invention relates to the technical field of sample detection, belongs to an analytical chemical sample pretreatment device, is a thermal desorption device used in conjunction with a gas chromatograph, and is mainly used for solid-phase micro-extraction rods, solid-phase micro-extraction stirring rods, and bundled capillary solid-phase solid-phase micro-extraction rods. The phase microextraction tube and the thermal desorption of the packed adsorption column quickly desorb the adsorbed and enriched trace components. Background technique [0002] Solid-phase microextraction (SPME) is to adsorb or dissolve the target components in the sample to the extraction stationary phase to achieve the purpose of enriching the target components. It is an important sample in the analysis of trace organic pollutants. preprocessing techniques. Due to its simple operation, no use of organic solvents, and good enrichment effect, the technology has been rapidly develo...

AI Technical Summary

Problems solved by technology

In this patented design, there is a cold zone between the outlet of the inner liner tube and the area A of the sample transfer tube, and the area B between the sample transfer tube and the chromatographic injector, so that the thermally desorbed high-boiling components are in A and B Carryover in both zones reduces sample recovery and desorption repeatability, and components with boiling points above the thermal desorption temperature cannot be distilled

At the same time, there is no fixed connection design between the desorber and the gas chromatographic sampler, and the fixation of the desorber needs external equipment to assist in the process of use.

In addition, the desorption carrier gas is introduced from the pressure cap of the liner, which is very inconvenient to use

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