QuECHERS-气相色谱法测定大米中7种有机磷农药残留

摘要

通过优化QuECHERS样品前处理方法,建立一种快速测定大米中7种有机磷农药残留的气相色谱法.将10 g样品用10 mL水浸润后加入10 mL乙酸乙酯提取,5 g无水硫酸镁和2 g氯化钠盐析分层,N-丙基-乙二胺(PSA)和C18粉净化后直接用气相色谱仪分析.该方法中7种有机磷农药在0.008～0.200mg/L范围内具有良好的线性关系,相关系数0.99,加标回收率92.7％ ～ 98.2％,最低检出限0.003 ～0.006mg/kg.本方法简便快捷、准确可靠、灵敏度高、成本低,适用于大批量大米中有机磷农药残留量的测定.%A gas chromatography (GC) method was developed for fast determining the contents of 7 organic phosphorus pesticides in rice using optimized QuECHERS method and.After 10 g samples were wet by 10 mL water,the residues in the samples were extracted by 10 mL ethyl acetate,and 5 g anhydrous magnesium sulfate and 2 g sodium chloride were salted out.PSA and C18 were purified,and then analyzed directly by GC.The results indicated that the method displayed good linearity in the concentration of 7 organic phosphorus pesticides ranged from 0.008 to 0.200 mg/L with the correlation coefficient of 0.99,the average recoveries ranged from 92.7 to 98.2％ and the limit of detection ranged from 0.003 to 0.006 mg/kg.This method is simple,fast,accurate,cost and suitable for determination of organic phosphorus pesticides in numbers of rice.