Study on analysis of the organic phosphorus pesticide residues in soil

An analysis method for nine kinds of organophosphate pesticides residues in soil included dichlorvos,methamidophos,phorate,omethoate,diazinon,dimethoate,parathion-methyl,malathion,parathion,isocatbophos and quinalphos was established in this research.The pesticide residues were extracted from soil samples with acetone:dichloromethane=1:3;separated on a capillary column Hp-5MS(30m×0.25 mm×0.25 μm) after concentration and detected by gas chromatography with flame photometric detector(GC-FPD).As a result,the detection limits of this method for nine Organophosphate Pesticides were in the range of 0.397-1.60μg/mL with relative standard deviations ranging from5.47% to10.20%(n=5)and the recoveries were from 68.7% to 110.4%.The results indicated that this method could be used for the determination of organophosphate pesticide residues in soil.