Micro-porous membrane liquid-liquid extraction as an enrichment step prior to nonaqueous capillary electrophoresis determination of sulfonylurea herbicides |
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Authors: | Qingxiang Zhou Jingfu LiuYaqi Cai Guoguang LiuGuibin Jiang |
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Institution: | a Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, PR China b Key Laboratory of Environmental Sciences and Engineering of High Education of Henan Province, School of Environmental Sciences and Chemistry, Henan Normal University, Xinxiang 453002, Henan, PR China |
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Abstract: | A method based on micro-porous membrane liquid-liquid extraction (MMLLE) enrichment and nonaqueous capillary electrophoresis (CE) separation, was established for the analysis of sulfonylurea herbicides in water samples. After MMLLE, the analyte trapped in the chloroform was treated mildly with nitrogen flow to dryness and then dissolved in 200 μl of 4 mM Tris methanol solution for CE analysis. Five sulfonylurea herbicides were separated by nonaqueous CE with Tris/acetate of methanol solution as the run buffer. MMLLE related parameters such as organic solvent used as acceptor, sample flow rate, sample pH, enrichment time, and salt effect were investigated with tribenuron methyl (TBM) as a model compound. Results showed that with a sample flow rate of 3.0 ml min−1 and an enrichment time of 20 min, the proposed method has good linear relationship over the scope of 1-15 ng ml−1 with related coefficient of R2=0.9911, and a detection limit of 0.4 ng ml−1. This method was applied to determine TBM in realworld water samples with recoveries over the range of 89-97%. |
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Keywords: | Micro-porous membrane liquid-liquid extraction Nonaqueous capillary electrophoresis Sulfonylurea herbicides |
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