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研究建立了一种简便、快速的Quechers前处理方法,采用气相色谱法检测19种有机磷类农药。试验结果显示:19种有机磷类农药平均回收率在70.1%~121.7%,相对标准偏差(RSD)介于1.7%~7.5%,19种有机磷类农药的检出限(LOD)为0.02 mg/kg,测定低限(LOQ)为0.1 mg/kg。用空白样品配制浓度范围为0.05~0.5μg/mL的基质标准工作曲线的浓度范围内有机磷农药均有较好的线性关系,相关系数(r2>0.998)。由于各项技术指标均满足农药残留检测的要求,适合出口番茄酱中19种有机磷残留量的日常检验。
The study established a simple and rapid method of Quechers pretreatment, using gas chromatography to detect 19 kinds of organophosphorus pesticides. The results showed that the average recoveries of 19 organophosphorus pesticides ranged from 70.1% to 121.7% with relative standard deviations (RSDs) ranging from 1.7% to 7.5%. The detection limits (LODs) of 19 organophosphorus pesticides were 0.02 mg / kg, and the lower limit of determination (LOQ) was 0.1 mg / kg. The concentration of organophosphorus pesticides in the range of 0.05-0.5 μg / mL for the standard working curve prepared with blank samples had a good linear relationship (r2> 0.998). As the technical indicators to meet the requirements of pesticide residue testing, suitable for export 19 kinds of organic phosphorus residues in tomato sauce routine inspection.