Method for detecting O, O-dimethyl thiophosphoramide in soil

Abstract

The invention belongs to the technical field of environmental analysis, and particularly discloses a method for detecting O, O-dimethyl phosphorothioate in soil. The method comprises the following steps: (1) collecting a soil sample, and removing impurities; (2) extracting the pretreated sample by using methanol, specifically, weighing the granular soil sample, adding the methanol, uniformly mixing, then carrying out centrifugal treatment, taking a supernatant, passing through an organic phase nylon filter membrane, and waiting for LC-MS / MS detection; (3) preparing to obtain O, O-dimethyl phosphorothioamide standard working solutions with gradient concentrations; and (4) analyzing and detecting by using a high performance liquid chromatography-triple quadrupole tandem mass spectrometer. According to the method, the recovery rate of the O, O-dimethyl thiophosphoramide ranges from 90% to 100%. And the detection limit of the O, O-dimethyl thiophosphoramide is less than or equal to 0.89 ng / g. The method is suitable for detecting the residual amount of the O, O-dimethyl thiophosphoramide in the soil.

Description

technical field [0001] The invention belongs to the technical field of environmental analysis, in particular to a method for detecting O,O-dimethylphosphorothioate in soil. Background technique [0002] O,O-dimethylthiophosphoramide is an intermediate in the production of organophosphorus pesticides. Although some highly toxic organophosphates have been banned in recent years, due to the large production tonnage and many manufacturers in my country, and the long half-life of such pesticides, It is persistent, so it can still be detected in soil, water, and agricultural products. At present, there are reports on the detection methods of organic phosphorus such as temperament and liquid quality at home and abroad. However, for the intermediate O,O-dimethylphosphorothioate There are few reports on the detection of amides. As an intermediate of organophosphorus pesticides, O,O-dimethylphosphorothioate may enter soil, water and other environments with the use of organophosphorus p...

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Problems solved by technology

[0002] O,O-dimethylphosphorothioate is an intermediate in the production of organophosphorus pesticides. Although some highly toxic organophosphates have been banned in recent years, due to the large production tonnage and many manufacturers in my country, and the long half-life of such pesticides, It is persistent, so it can still be detected in soil, water, and agricultural products. At present, there are reports on the detection methods of organic phosphorus such as temperament and liquid quality at home and abroad. However, for the intermediate O, O-dimethylphosphorothioate There are few reports on the detection of amides

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