Objectives To establish an analytical method for determination of organophosphorus pesticides (OPPs) in food poisoning samples by gas chromatography-mass spectrometry (GC-MS).
Methods Samples were extracted by acetonitrile oscillation and centrifuged after being purified by QuEChERS powder. The supernatants were blown by nitrogen and concentrated to near dryness with acetone to a volume of 1 mL.Then the concentrated solutions were quantitatively detected by gas chromatography-mass spectrometer in selected ion scan mode.
Results The method showed a linearity range of (0.1~5.0) μg/L with linear correlation coefficients of 0.98~0.99, and the Limit of Detection (LOD) was (0.002~0.044) mg/kg. The average recoveries were 82.3%~124.0% at the addition level of (0.02~0.8) mg/kg with the relative standard deviation (RSD) of 2.5%~14.6%.
Conclusions This method is simple and fast and can satisfy the detection of organophosphorus in food poisoning samples.
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