期刊
ELECTROPHORESIS
卷 31, 期 3, 页码 575-582出版社
WILEY
DOI: 10.1002/elps.200900380
关键词
CE; Contactless conductivity detection; Glyphosate; Glufosinate; Online preconcentration
资金
- Universiti Teknologi Malaysia
- Ministry of Science, Technology and Innovation, Malaysia
Rapid and direct online preconcentration followed by CE with capacitively coupled contactless conductivity detection (CE-(CD)-D-4) is evaluated as a new approach for the determination of glyphosate, glufosinate (GLUF), and aminophosphonic acid (AMPA) in drinking water. Two online preconcentration techniques, namely large volume sample stacking without polarity switching and field-enhanced sample injection, coupled with CE-(CD)-D-4 were successfully developed and optimized. Under optimized conditions, LODs in the range of 0.01-0.1 mu M (1.7-11.1 mu g/L) and sensitivity enhancements of 48- to 53-fold were achieved with the large volume sample stacking-CE-(CD)-D-4 method. By performing the field-enhanced sample injection-CE-(CD)-D-4 procedure, excellent LODs down to 0.0005-0.02 mu M (0.1-2.2 mu g/L) as well as sensitivity enhancements of up to 245- to 1002-fold were obtained. Both techniques showed satisfactory reproducibility with RSDs of peak height of better than 10%. The newly established approaches were successfully applied to the analysis of glyphosate, glufosinate, and aminophosphonic acid in spiked tap drinking water.
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