期刊
CHEMOSPHERE
卷 90, 期 6, 页码 1860-1869出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.10.007
关键词
Pesticides; Freshwater; SPE; SPME; GC-MS; Priority pollutants
资金
- Agencia Nacional de Promocion Cientifica y Tecnica [FONCyT-PICT/2007 1209, 1225]
- Secretaria de Ciencia y Tecnica (SECyT)
- CONICET (National Research Council, Argentina)
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.
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