Fully automatic sample thermal desorption and liquid phase micro-enrichment device

Abstract

The invention relates to a full-automatic sample thermal desorption and liquid phase micro-enriching device which comprises a heating device, a condensing device, an enriching device and a controller, wherein the heating device comprises a heating body; a heating slot is formed in the heating body; a quartz sample pipe is arranged in the heating slot; a high-temperature polytetrafluoroethylene pad is arranged at a pipe opening of the quartz sample pipe; a stainless steel pipe is arranged between the heating body and the quartz sample pipe; one end of the stainless steel pipe is arranged in the quartz sample pipe; the other end of the stainless steel pipe is connected with a micro-flow controller; a nitrogen cylinder is connected with the micro-flow controller; a syringe needle is arranged on the high-temperature polytetrafluoroethylene pad; one end of the syringe needle is arranged in the quartz sample pipe; the other end of the syringe needle is connected with the condensing device; the enriching device is connected with the condensing device; electric connecting wires are arranged between the heating body and the micro-flow controller as well as the controller. The full-automatic sample thermal desorption and liquid phase micro-enriching device has the advantages of simple structure, convenience in use, low cost, integrated function of extracting, purifying and condensing, less dosage, short enriching time and higher enriching efficiency.

Description

technical field [0001] The invention belongs to the technical field of analytical chemical gas chromatography sample pretreatment, and in particular relates to a fully automatic sample thermal desorption and liquid phase micro-enrichment device. Background technique [0002] In the process of gas chromatography sample analysis, sample treatment is a very important step. Solid phase microextraction and liquid phase microextraction are currently the most recommended sample pretreatment techniques. Because the volume of the extraction phase of micro-extraction technology is much smaller than the sample volume, it is defined as micro-extraction, which almost overcomes all the shortcomings of traditional sample processing methods. Among them, liquid-phase microextraction was proposed on the basis of liquid-liquid extraction. This technology integrates extraction, purification, and concentration. It has developed rapidly since it came out, and has entered various fields of analyti...

AI Technical Summary

Problems solved by technology

However, the airflow purging-microsyringe extraction technology also has some shortcomings: for example, when the injection needle is pulled out from the condenser after extraction, the solvent is easy to fall from the injection needle; the manual operation method is complicated; the injection needle is easy to block and has a short service life and high cost ; The target substance in the syringe is prone to residue during manual elution

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