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|Title:||Determination of acidic herbicides in surface water by solid-phase extraction followed by capillary zone electrophoresis|
|Source:||Qin, W.,Wei, H.,Li, S.F.Y. (2002-08). Determination of acidic herbicides in surface water by solid-phase extraction followed by capillary zone electrophoresis. Journal of Chromatographic Science 40 (7) : 387-391. ScholarBank@NUS Repository.|
|Abstract:||A rapid solid-phase extraction-capillary zone electrophoresis (CZE) method for determining 2,4-dichlorophenoxyacetic acid, 4-(2,4- dichlorophenoxy) butyric acid, and 2,4,5-trichlorophenoxyacetic acid in real water samples is described. Factors affecting the recoveries and detection of the targets are investigated. With samples being acidified to pH 2 and salted by sodium sulfate to 2% (w/w), an average recovery of greater than 85% is obtained using ethyl acetate as the eluent on an octadecylsilane-bonded silica cartridge. A running buffer of 5mM sodium tetraborate in a water-acetonitrile mixture (70:30, v/v) adjusted to pH 9 is employed in the CZE analysis, and the targets can be analyzed within 7 min with good reproducibility and acceptable sensitivity. The method is suitable for detecting herbicide residues of subparts-per-billion levels in surface water. A local pond water is analyzed, and the concentrations of 2,4-dichlorophenoxyacetic acid and 4-(2,4-dichlorophenoxy) butyric acid are detected to be 0.27 ± 0.03 ppb and 0.61 ± 0.08 ppb, respectively.|
|Source Title:||Journal of Chromatographic Science|
|Appears in Collections:||Staff Publications|
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