固相萃取-超高效液相色谱-串联质谱法检测环境水体中18种农药残留

建立了固相萃取-超高效液相色谱-串联质谱(SPE-UPLC-MS/MS)同时检测环境水体中不同极性范围的18种农药残留的分析方法。样品经大体积固相萃取装置,以2 mL/min的速率通过Cleanrt■-PEP固相萃取柱进行净化和富集,浓缩50倍后结合UPLC-MS/MS检测,外标法定量。研究表明,目标化合物在0.5~50μg/L范围内线性关系良好,线性相关系数(R^2)≥0.995;在10、100和1 000 ng/L 3个添加水下,18种农药在3种不同环境水体中的平均回收率为71.3%~105.9%,相对标准偏差(RSD,n=5)为1.3%~9.9%;定量限(LOQ)均为10 ng/L。该方法应用于泰安市区周围水环境的检测,各采集位点均未检出农药残留。该方法具有净化效果好、通用性强、灵敏度高、准确度高和操作简单等优点,适用于环境水体中18种农药的残留检测。

Determination of 18 pesticide residues in environmental water by solid phase extraction-ultra performance liquid chromatography-tandem mass spectrometry

A method was developed for the simultaneous determination of 18 pesticide residues in environmental water by solid phase extraction-ultra performance liquid chromatography-tandem mass spectrometry (SPE-UPLC-MS/MS). The samples were purified and enriched by a large-volume SPE apparatus through a Cleanrt^®-PEP SPE column at a rate of 2 mL/min. After being concentrated 50-fold, the samples were detected by UPLC-MS/MS and quantified by the external standard method. The target compounds showed good linearity in the range of 0.5-50 μg/L, with linear correlation coefficients (R²) ≥0.995. At spiked levels of 10, 100 and 1000 ng/L, the average recoveries of the 18 pesticides in the three different environmental water samples were 71.3%-105.9%, and the relative standard deviations (RSDs, n=5) were 1.3%-9.9%. LOQs of the 18 pesticides were 10 ng/L. The method was applied to the detection of the water environment around Tai'an City, and no pesticide residues were detected at any of the collection sites. The method has the advantages of good purification effect, high versatility, sensitivity, and accuracy, and operational simplicity. The method is suitable for the determination of the 18 pesticides in environmental water.