Thermal desorption and sampling device for methyl mercury

Abstract

The invention discloses a thermal desorption and sampling device for methyl mercury. The thermal desorption and sampling device comprises a flow meter and a thermal desorption device, wherein the thermal desorption device comprises a heating coil, a heating power supply, a heating switch and a heating power supply and voltage regulator; when an experiment for determining the content of the methyl mercury is carried out, an argon bottle is firstly opened; argon enters the lower end of the flow meter through a PFA gas pipeline, then flows out from the upper end of the flow meter, and enters a methyl mercury-enriched Tenax adsorption pipe through the PFA gas pipeline; and the heating coil sleeves the adsorption pipe. According to the thermal desorption and sampling device, carrier gas flow control and heating desorption devices are integrated; the thermal desorption and sampling device is simple in structure and convenient to operate; thermal desorption and sampling operation on the methyl mercury are greatly simplified; experiment efficiency is improved; and compared with devices with the similar functions, the thermal desorption and sampling device is extremely low in construction cost.

Description

technical field [0001] The invention relates to a chemical analysis device, in particular to a methylmercury thermal analysis sampling device. Background technique [0002] In the analysis method of methylmercury, high performance liquid chromatography (HPLC) or gas chromatography (GC) are generally used for separation. HPLC can achieve a good separation effect, but due to the dilution of the mobile phase, it often leads to a high detection limit. Usually, the method of liquid-liquid extraction or solid-phase extraction is used to enrich the sample, and the operation is cumbersome. GC is easy to combine with purge and trap (P&T), solid phase microextraction (SPME) and other methods. It has the advantages of low matrix interference, easy operation, etc., and has high sensitivity. [0003] For the determination of samples with trace amounts of methylmercury content, water phase ethylation derivatization-purge and trap technology is often used abroad. This method first carries...

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Problems solved by technology

[0004] Existing thermal desorption sampling devices are often improved from gas chromatograph inlets, with complex structures; the adsorption tubes used are all special accessories for specific chromatography, which are expensive; the inlets are always at relatively high temperatures, Inconvenient to operate

The thermal desorption sampling device of the imported methylmercury analyzer is expensive, and it is an integral part of the complete set of equipment, which cannot be disassembled and controlled separately, so it cannot be used in conjunction with other equipment

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