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[Wiley数据库][2011]Determination of insecticides in water using in situ halide exchange reaction-assist
发布时间:2016-01-25 16:00:00 阅读次数:
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题名
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[Wiley数据库][2011]Determination of insecticides in water using in situ halide exchange reaction-assisted ionic liquid dispersive liquid–liquid microextraction followed by highperformance liquid chromatography
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参考引用方式
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Songqing Li, Haixiang Gao, Jiaheng Zhang, Yubo Li, Bing Peng, Zhiqiang Zhou. J. Sep. Sci. 2011, 34, 3178–31853178
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研究机构
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中国农业大学
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所涉及离子液体
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研究领域
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分散液-液微萃取；原位卤交换反应；离子液体；农药检测
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论文摘要
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A dispersive liquid–liquid microextraction (DLLME) method using in situ halide exchange reaction to form ionic liquid (IL) extraction phase was developed to determine four insecticides (i.e. methoxyfenozide, tetrachlorvinphos, thiamethoxam, and diafenthiuron) in water samples. The preconcentration procedure, followed by high-performance liquid chromatography and variable wavelength detectors (VWD), enabled the formation of the immiscible IL extraction phase; the insecticides were transferred into the IL phase simultaneously, which enhanced the efficiency and sufficiency, greatly shortening the operation time. The experimental parameters affecting the extraction efficiency including volume of extraction IL, extraction and centrifugation times, volume of the sample solution and exchanging reagent, and addition of organic solvent and salt were investigated and optimized. Under optimized conditions, the extractions yielded recoveries of the target analytes from 82 to 102%. The calibration curves were linear, and the correlation coefficient ranged from 0.9990 to 0.9999 under the concentration levels of 5–200mg/L. The relative standard deviation (n56) was 2.9–4.6%. The limits of detection (LODs) for the four insecticides were between 0.98 and 2.54mg/L.
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关键词
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Dispersive liquid–liquid microextraction / Insecticides / In situ halide exchange reaction / Ionic liquid
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