Determination of Organophosphorous Pesticide Residues by Matrix Solid-phase Dispersion-Gas Chromatography

Matrix solid-phase dispersion technique was used to extract and purify nineteen kinds of organophosphorous pesticide residues from five matrixes such as cabbage,pear,chicken,corn and purple broccoli.The contents of organophoshorous pesticide residues were determined by gas chromatography with a flame photometric detector(FPD).Through the optimization of absorbent,eluent and elution volume,a preparation method for determining organophosphorous pesticide residues was established.The recovery rates of monocrophos,cyanophos,isocarvophos,cadusafos and triazophos in spiked samples at concentrations of 0.02 mg/kg and 0.05 mg/kg,were between 75.0% and 109.2% with a relative standard deviation(RSD) of lower than 16%.Therefore,this method is suitable for pesticide residue analysis.