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Micro-porous Membrane Liquid–liquid Extraction as an Enrichment Step Prior to Nonaqueous Capillary Electrophoresis Determination of Sulfonylurea Herbicides by Qingxiang Zhou; Jingfu Liu; Yaqi Cai; Guoguang Liu; Guibin Jiang is a Chemistry article available to read on EtoBox.

What is Micro-porous Membrane Liquid–liquid Extraction as an Enrichment Step Prior to Nonaqueous Capillary Electrophoresis Determination of Sulfonylurea Herbicides about?

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 ml of 4 mM Tris methanol solution for CE analysis. Five sulfonylurea herbicides were separated by nonaqueous CE with Trisyacetate 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 and y1 an enrichment time of 20 min, the proposed method has good linear relationship over the scope of 1-15 ng ml y1 with related coefficient of R s0.9911, and a detection limit of 0.4 ng ml . This method was applied to determine 2 y1 TBM in realworld water samples with recoveries over the range of 89-97%.

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Author

Qingxiang Zhou; Jingfu Liu; Yaqi Cai; Guoguang Liu; Guibin Jiang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0026-265X)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)