Multi-residues Determination of 19 Organophosphorus Pesticides in Apple by Gas Chromatography

A rapid method was developed for the determination of 19 organophosphorus pesticides in apples.The sample was firstly extracted by ultrasonic with acetonitrile,and then the extracts were concentrated with rotary evaporator and determined by gas chromatography equipped with Flame Photometric Detector.The results showed that when the additive level of 19 organophosphorus pesticides is 0.05 mg/kg to 1.5 mg/kg,their average recoveries from apples are 73.4% to 123% with the relative standard deviation(RSD) of 0.34% to12.59%,the limits of detection(LODs) are 1.0 μg/L to 5.0 μg/L,and the limits of quantification(LQDs) are 3.3 μg/kg.This developed method can be used to determine organophosphorus pesticides in commercial fruit samples.