A rapid sample pretreatment method for the detection of polychlorinated biphenyls in tea

Abstract

A rapid sample pretreatment method for detection of polychlorinated biphenyls in tea, characterized in that: sequentially comprising the following steps: taking pulverized tea samples in a centrifuge tube, adding anhydrous sodium sulfate and n-hexane-acetone solution , vortexed and mixed, ultrasonically extracted, centrifuged, the supernatant was taken, concentrated by nitrogen blowing, and then fixed to volume with toluene to obtain the tea sample solution to be purified; add carboxylated multi-walled carbon nanotubes, PSA and anhydrous magnesium sulfate, vortex Spin, centrifuge, take the supernatant liquid nitrogen and blow it nearly dry, add n-hexane quantitatively, vortex and mix, filter the membrane, and obtain the tea sample purification solution for GC-MS analysis. The invention effectively reduces the interference of impurities such as pigments, tea polyphenols and catechins in the matrix, obtains better extraction efficiency and purification effect, and is simple, fast and accurate in operation and high in sensitivity.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a rapid sample pretreatment method for the detection of polychlorinated biphenyls in tea. The rapid sample pretreatment method is based on a modified carbon nanotube material as the main dispersed solid phase extraction The pretreatment method of reagents, combined with gas chromatography-mass spectrometry (GC-MS), can be used for the simultaneous detection of 18 polychlorinated biphenyls (PCBs) in tea. Background technique [0002] Polychlorinated biphenyls (PCBs) are a class of artificially synthesized chlorinated biphenyl aromatic compounds, which have been widely used as high-quality industrial additives (heat carriers, flame retardants, plasticizers, insulating materials, etc.) in printing, chemical industry, electric power, etc. , plastics, paints and other fields. Literature studies have shown that PCBs can cause endocrine disorders, immune and reproductive system dama...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a rapid sample pretreatment method for detection of polychlorinated biphenyls in tea. The problem of high cost of materials used

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