Determination method for OCPs in environmental sample

Abstract

The invention discloses a determination method for OCPs in an environmental sample, which belongs to the field of detection of OCPs. The determination method comprises the following steps: carrying out Soxhlet extraction on a to-be-determined environmental sample so as to obtain a liquid extract containing OCPs; carrying out separation and purification, i.e., concentrating the liquid extract to a constant volume, adding an aqueous solution of tetrabutyl ammonium sulfite and isopropanol, carrying out oscillation until a solid residue is generated after repeated shaking every time, discarding a lower layer, retaining an organic phase, washing the organic phase, removing water by using anhydrous sodium sulfate, carrying out purification by using a Florisil column so as to obtain an eluate, concentrating the eluate to a constant volume and dividing the concentrated eluate into two groups which are used as samples for subsequent detection, wherein one of the groups is a sample of OCPs stable in sulfuric acid and is purified by using a sulfuric acid silica gel column so as to obtain a purified sample, and the other of the groups is a sample of OCPs instable in sulfuric acid and is purified by using an Envi-carb SPE small column so as to obtain a purified sample; and carrying out determination, i.e., respectively analyzing and determining the two groups of purified samples by using an HRGC-HRMS apparatus so as to obtain determination results of the content of OCPs in the two groups of purified samples. The determination method provided by the invention enables accuracy and sensitivity of determination to be improved.

Description

technical field [0001] The invention relates to the field of detecting OCPs, in particular to a method for measuring OCPs content in samples such as soil and sediment. Background technique [0002] Due to the high toxicity, persistence, accumulation and long-distance migration of persistent organic pollutants (POPs), it has attracted widespread attention in the field of environmental science. In 2001, the first batch of 12 POPs were listed as priority pollutants. So far, 21 substances have been included in the "blacklist". These 21 substances can be divided into pesticides (OCPs), industrial chemicals and unintentional discharge by-products. Three categories. [0003] OCPs exist in the environment at trace and ultra-trace levels, and there may be a variety of high-concentration interfering substances in a large number of extramatrix samples: polychlorinated naphthalene (PCN), polychlorinated diphenyl ethers (PCDPEs), polychlorinated Triphenylene (PCTs), studies have shown ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for measuring OCPs in environmental samples, which can accurately measure the content of OCPs in environmental samples, thereby solving the problem that existing measuring methods cannot accurately measure the content of OCPs in environmental samples

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