快速溶剂萃取-气相色谱法测定黑芝麻中多种有机磷农药

建立了黑芝麻中5种有机磷农药残留的快速分析方法。以乙腈作为溶剂,采用快速溶剂萃取仪萃取,净化后气相色谱检测。结果 :提取温度80℃,提取压力10MPa,加热5min,静态提取5min,循环2次,可对样品中5种有机磷农药进行有效提取。5种有机磷农药的检测限为0.021mg/kg(乐果)～0.038mg/kg(甲基对硫磷)。当试样中有机磷农药的添加浓度分别为0.05和0.1mg/kg时,回收率为88.2%～104.5%。方法的最低检测限和添加回收率均符合农药残留分析的要求。

Determination of Organophosphorus Pesticide in Black Sesame by Accelerated Solvent Extraction-Gas Chromatography

A rapid method has been developed to determine several residues of organophosphorus pesticide in black sesame. The samples were extracted with acetonitrile by accelerated solvent extraction, and determined by gas chromatography after purifi cation. The optimized extracting condition was under the temperature 80°C and the pressure was l0 MPa, 5 min static extraction, heating 5 min and cycling 2 times. The limits of detection （LODs） ranged from 0.021 mg/kg （dimethoate）~0.038 mg/kg （Methyl parathion）. The recoveries ranged from 88.2% to 104.5% in blank samples spiked with 0.05and 0.1 mg/kg of 5 organophosphorus pesticides. The LOQs and the recoveries of the method can satisfy the requirement of pesticide residue analysis.