Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 52, Issue 4, Pages 785-792Publisher
CHINESE CHEM SOC
DOI: 10.1002/jccs.200500110
Keywords
capillary electrophoresis; acetonitrile-salt mixture; herbicides; glyphosate; glufosinate; aminomethylphosphonic acid
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A capillary electrophoresis (CE) with UV absorption detection method is described for the simultaneous determination of glufosinate, glyphosate, and aminomethylphosphoric acid. The 9-fluorenylmethyl chloroformate (FMOC-Cl) was used for precolumn derivatization of the non-absorbing herbicides. The three analytes were separated by CE in 9 min with 25 mM borate buffer at pH 9, followed by detection with a UV detector at 260 nm. We demonstrate how the detection limit can be enhanced by using acetonitrile-salt mixtures. With acetonitrile-salt mixtures, the limit of detection (LOD) was in the 10(-7) M range. Linearity of more than two orders of magnitude was generally obtained. Precisions of migration times and peak areas were less than 0.9% and 7.5%, respectively. The applicabilities of the method for the analysis of ground water and lake water were examined.
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