30种农药残留在葡萄柚和三红柚中基质效应的比较

Comparison of matrix effects of 30 pesticide residues in grapefruit and Sanhong pomelo

采用QuEChERS前处理法、正离子多反应监测(MRM)模式及外标法定量等方法,对葡萄柚和三红柚中30种农药残留测定过程中产生的基质效应进行比较。结果表明:30种农药在柚基质中主要呈强基质效应,总体范围为24.94%~405.87%。其中,特丁硫磷在2种基质中呈中等基质效应,滴滴涕在葡萄柚基质中呈强基质效应,但在三红柚基质中呈中等基质效应。30种农药在50~250μg/L范围内线性关系良好,回归方程相关系数(r)为0.991 8~0.998 3,样品回收率(R)为63.13%~116.29%,相对标准偏差(RSD)为0.06%~11.60%。该方法简单、快捷,适合柚中常用农药的快速测定。

In this paper, methods such as QuEChERS pretreatment, positive ion multiple reaction monitoring(MRM) mode and external standard method quantification were used to systematically study the matrix effects produced during the determination of 30 pesticide residues in grapefruit and Sanhong pomelo.By comparing the measurement results, the 30 pesticides mainly showed strong matrix effects in the pomelo matrix, and the overall range was between 24.94% and 405.87%.Among them, terbuthion showed a moderate matrix effect in the two substrates, DDT showed a strong matrix effect in the grapefruit matrix, but showed a moderate matrix effect in the Sanghong pomelo matrix.The 30 pesticides had a good linear relationship in the range of 50~250 μg/L, the correlation coefficient of the regression equation(r) was between 0.991 8 and 0.998 3, the sample recovery(P) was between 63.13% and 116.29%, and the relative standard deviation(RSD) was between 0.06% and 11.60%.The method was simple, fast, and suitable for the rapid determination of commonly used pesticides in pomelo.