Analysis of chlorothalonil and degradation products in soil and water by GC/MS and LC/MS

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• 作者：Alicia Chaves ; Damian Shea ; David Danehower
• 关键词：Metabolites ; LC/MS ; Pesticides ; Fungicides ; SPE
• 刊名：Chemosphere
• 出版年：2008
• 期刊代码：15_00456535
• 类别：env
• 出版时间：March 2008
• 卷：71
• 期：4
• 页码：629-638
• 文件大小：161 K

摘要

We present a method using gas chromatography (GC) and liquid chromatography (LC) coupled to a mass selective detector to measure concentrations of the fungicide chlorothalonil and several of its metabolites in soil and water. The methods employed solid-phase extraction using a hydrophobic polymeric phase for the isolation of analytes. In lake water, average analyte recoveries ranged from 70%to 110%, with exception of pentachloronitrobenzene that gave low recoveries (23%). The method detection limits were determined to be in the range of 1 and 0.1 μg l⁻¹ for the LC and GC methods, respectively. In soil samples, recoveries ranged from 80%to 95%for 4-hydroxy-2,5,6-trichloroisophthalonitrile (metabolite II) and 1,3-dicarbamoyl-2,4,5,6-tetrachlorobenzene (metabolite III). Limits of detection (LOD) were 0.05 and 0.02 μg g⁻¹, respectively. Chlorothalonil and other metabolites were analyzed by GC giving recoveries ranging from 54%to 130%with LOD of 0.001−0.005 μg g⁻¹.