The pre-treatment method uses liquid-liquid extraction to extract organophosphorus pesticides in water,and under certain conditions,gas chromatography-mass spectrometry(GC-MS)analysis is used to analyze and determine three types of organophosphorus pesticides in water,including parathion,methyl parathion,and malathion.In order to improve the pre-treatment efficiency of organic phosphorus pesticides,the effects of different extraction solvents,extraction times,and concentration conditions on the results were studied.
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