Department of Chemistry, University of Girona, C/ Maria Aurèlia Capmany 69., 17003 Girona, Spain.
Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, H2O Building. C/ Emili Grahit 101, 17003 Girona, Spain.
Talanta. 2018 Aug 1;185:291-298. doi: 10.1016/j.talanta.2018.03.056. Epub 2018 Mar 26.
A simple and effective method for the detection of three pesticides (chlorpyrifos, diazinon and cyprodinil) is developed using a polymer inclusion membrane (PIM) prior to gas chromatography and mass spectrometry detection (GC-MS). Analytes are extracted from natural water samples using a 3 cm PIM made of the polymer, cellulose triacetate (CTA), and the plasticizer, nitrophenyl octyl ether (NPOE). Addition of the plasticizer to the CTA matrix is found to be necessary for the extraction of pesticides. After extraction, analytes are recovered from the membrane with 1 mL of acetonitrile and injected into the GC-MS system. The main factors affecting the extraction efficiency are evaluated, including membrane composition, stirring mode, extraction and elution time. Ultrasonic assisted elution of the extracted pesticides is accomplished after 15 min of contact. The PIM-assisted extraction method makes it possible for pesticides to be determined in the range of 50-1000 ng L with good linearity (coefficient of determination ≥0.995) and suitable recoveries (85-119%) and precision (<21%, n = 3) using 100 mL of a water sample. This methodology is shown to be suitable for the detection of chlorpyrifos in local river waters.
采用聚合物整体膜（PIM）在前处理，结合气相色谱-质谱联用（GC-MS）检测方法，建立了一种检测三种农药（毒死蜱、二嗪磷和 Cyprodinil）的简单有效的方法。用 3cm 长的聚合物-三醋酸纤维素（CTA）和增塑剂-邻硝基辛基醚（NPOE）组成的 PIM 从天然水样中萃取分析物。实验发现，在 CTA 基质中添加增塑剂对于萃取农药是必要的。萃取后，用 1mL 乙腈从膜中回收分析物，并注入 GC-MS 系统。评估了影响萃取效率的主要因素，包括膜组成、搅拌模式、萃取和洗脱时间。经过 15min 的接触，实现了超声辅助洗脱萃取的农药。使用 100mL 水样，该 PIM 辅助萃取方法可在 50-1000ng/L 范围内实现良好的线性（相关系数≥0.995）和合适的回收率（85-119%）和精密度（<21%，n=3），用于检测当地河水中的毒死蜱。该方法适用于检测当地河水中的毒死蜱。
