Method for extracting, synergistically separating and detecting polychlorinated biphenyl and dioxin in soil

Abstract

The invention discloses a method for extracting, synergistically separating and detecting polychlorinated biphenyl and dioxin in soil, which comprises the following steps: S1, weighing a soil sample, putting the soil sample into an extraction tank, respectively adding an isotope extraction internal standard of polychlorinated biphenyl and an isotope extraction internal standard of dioxin into the extraction tank, and mounting the extraction tank on a pressure solvent extractor, and performing extracting to obtain an extracting solution; s2, transferring the extracting solution into a composite chromatographic column, purifying and separating polychlorinated biphenyl and dioxin in the extracting solution by using different solvents to respectively obtain an eluent containing polychlorinated biphenyl and an eluent containing dioxin, concentrating the eluent containing polychlorinated biphenyl, adding an isotope sample injection internal standard of polychlorinated biphenyl, concentrating the dioxin-containing eluent, and adding an isotope sample injection internal standard of the dioxin; and S3, respectively carrying out qualitative analysis and quantitative detection on the polychlorinated biphenyl-containing concentrated solution and the dioxin-containing concentrated solution by adopting a high-resolution gas chromatography- high-resolution mass spectrometer.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to methods for the extraction, coordinated separation and detection of polychlorinated biphenyls and dioxins in soil. Background technique [0002] As we all know, dioxins and polychlorinated biphenyls are two typical types of persistent organic pollutants that are clearly controlled by the Stockholm Convention on Persistent Organic Pollutants. Dioxin is a general term for polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans, which are mainly organic compounds that connect two chlorine-containing benzene rings with 2 and 1 oxygen bond; It is a polychlorinated biphenyl organic compound formed by replacing multiple hydrogen atoms on biphenyl with chlorine atoms. Because the two types of compounds have similar chemical structures and physical and chemical properties, PCBs are also called dioxin-like PCBs. Due to their semi-volatility, environmental persistence, ...

AI Technical Summary

Problems solved by technology

[0004] At present, many scholars have carried out a lot of monitoring and research on dioxins and PCBs in the soil environment, but the research process has shortcomings such as time-consuming and laborious, especially in the rapid extraction of dioxins and PCBs. Therefore, it is necessary to study a method that can quickly realize the extraction, separation and quantitative detection of dioxins and PCBs in soil samples to improve the above problems

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