Thermal desorption-gas phase separation-thermal pyrolysis system based on phenylated derived organic mercury

Abstract

The invention discloses a thermal desorption-gas phase separation-thermal pyrolysis system based on phenylated derived organic mercury. The thermal desorption-gas phase separation-thermal pyrolysis system comprises a column box and a pressure-regulation and temperature-control switch box, wherein the pressure-regulation and temperature-control switch box is arranged at one end of the column box; the column box and the pressure-regulation and temperature-control switch box are provided with a thermal desorption assembly, a gas phase separation assembly, a thermal pyrolysis assembly and an assisting assembly; the thermal desorption assembly comprises a thermal desorption heating wire switch, a thermal desorption heating wire time control switch, a thermal desorption heating wire pressure regulator, a thermal analysis heating wire pressure regulator pressure-regulation knob, a thermal desorption heating wire and a Tenax adsorption pipe; the Tenax adsorption pipe is transversely mounted at the top of the column box; the thermal desorption heating wire is mounted at the outer part of the Tenax adsorption pipe. According to the thermal desorption-gas phase separation-thermal pyrolysis system disclosed by the invention, thermal desorption, gas phase separation and thermal pyrolysis parts are integrated, and methyl mercury and ethyl mercury in a sample can be effectively determined; compared with a traditional gas chromatograph, a programed temperature rising device has a smaller size, so that an experiment space is saved; meanwhile, programed temperature control can be realized, and temperature can be increased section by section.

Description

Technical field [0001] The invention relates to the technical field of organic mercury analysis equipment, in particular to a thermal analysis-gas phase separation-thermal cracking system based on phenyl-derived organic mercury. Background technique [0002] Mercury and its compounds are a class of highly toxic persistent toxic pollutants. Among them, organic mercury is a highly toxic form that will cause serious harm to the ecological environment. At present, the ethylation derivatization-purge and trap-gas phase separation technology is mostly used at home and abroad to determine methylmercury. The specific steps are first to use sodium tetraethyl borate (NaBEt 4 ) The samples were derivatized by ethylation, the methyl mercury and inorganic mercury were converted into volatile methyl ethyl mercury and diethyl mercury, and then the above samples were purged and trapped into the Tenax packing tube by nitrogen gas. After the header is thermally analyzed, it is passed into a gas p...

AI Technical Summary

Problems solved by technology

The separation process of methylphenylmercury and ethylphenylmercury generated after phenylation derivatization requires continuous heating. Currently, organic mercury analysis instruments based on ethylation derivatization can only set the temperature to a certain constant value, which cannot meet the separation requirements. Requirements, on the other hand, due to the poor gasification of methylphenylmercury and ethylphenylmercury, if the organic mercury analysis instrument developed based on ethylation derivation is used, the problem of sample condensation in the pipeline will occur

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