Determination of priority pesticides in water samples combining SPE and SPME coupled to GC-MS. A case study: Suquia River basin (Argentina)
Determination of priority pesticides in water samples combining SPE and SPME coupled to GC-MS. A case study: Suquia River basin (Argentina)
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DOI：
10.1016/j.chemosphere.2012.10.007
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发表时间：
2013-02-01
期刊：
影响因子：
8.8
通讯作者：
Alberto Wunderlin, Daniel
中科院分区：
文献类型：
--
作者：
Ines Bonansea, Rocio;Valeria Ame, Maria;Alberto Wunderlin, Daniel
本研究报告的组合方法，使用固相萃取（SPE），然后固相微萃取（SPME）集中不同的农药，包括氯化，有机磷，三嗪类，拟除虫菊酯和氯乙酰胺，目前在痕量水平的水样。通过气相色谱-质谱联用（GC-MS）进行鉴别和定量。优化后的方法显示定量限在ng L-1水平（范围为0.2-3.5 ng L-1），此外精密度和耐用性也可接受（回收率为63- 104%，RSD为4%-23%），提出了一种新的方法，以达到痕量水平，类似于使用EC检测器，该方法应用于苏基亚河流域农药的时空分布研究（科尔多瓦-阿根廷）。正如预期的那样，在密集农业做法的地区观察到最高水平的农用化学品，阿特拉津（最高）。= 433.9 ng L-1）、α-环丙孕酮（max. = 121.7纳克/升）和硫丹硫酸盐（最大值）。= 106.7 ng L-1）占主导地位。在城市地区，普遍使用的农药是甲-氯氰菊酯。这些结果提请注意农药监测计划的需要，在河流中，考虑到城市和农村部分。(C)2012爱思唯尔有限公司版权所有。
This study reports a combined method using solid phase extraction (SPE), followed by solid phase microextraction (SPME) to concentrate different pesticides, including chlorinated, organophosphorus, triazines, pyretroids and chloroacetamides, present at trace levels in water samples. Identification and quantification was carried out by gas chromatography coupled to Mass Spectrometry (GC-MS). The optimized methodology showed LOQs at ng L-1 levels (ranging 0.2-3.5 ng L-1) in addition to acceptable precision and robustness (recoveries ranged 63-104%, RSD from 4% to 23%), presenting a novel method to reach trace levels, similar to that obtainable using EC detector, with structural confirmation by MS during the analysis of a wide range of environmental pollutants.This method was applied to the study of temporal and spatial distribution of pesticides in the Suquia River basin (Cordoba-Argentina). As expected, highest levels of agrochemicals were observed in areas with intensive agricultural practices, being atrazine (max. = 433.9 ng L-1), alpha-cypermetrine (max. = 121.7 ng L-1) and endosulfan sulfate (max. = 106.7 ng L-1) predominant. In urban areas, the prevalent pesticide was alpha-cypermethrine. These results draw attention to the need of pesticide monitoring programs in rivers, considering both urban and rural sections. (C) 2012 Elsevier Ltd. All rights reserved.