Wan Ibrahim, Wan Aini and Sanagi, Mohd. Marsin and H. H. , See and P. C., Hauser (2010) Rapid and direct determination of glyphosate, glufosinate, and aminophosphonic acid by online preconcentration CE with contactless conductivity detection. Electrophoresis, 31 (3). 575 - 582. ISSN 1522-2683
Official URL: http://dx.doi.org/10.1002/elps.200900380
Rapid and direct online preconcentration followed by CE with capacitively coupled contactless conductivity detection (CE-C4D) 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-C4D were successfully developed and optimized. Under optimized conditions, LODs in the range of 0.01–0.1?µM (1.7–11.1?µg/L) and sensitivity enhancements of 48- to 53-fold were achieved with the large volume sample stacking-CE-C4D method. By performing the field-enhanced sample injection-CE-C4D procedure, excellent LODs down to 0.0005–0.02?µM (0.1–2.2?µg/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.
|Uncontrolled Keywords:||CE, contactless conductivity detection, glyphosate, glufosinate, online preconcentration|
|Deposited By:||Liza Porijo|
|Deposited On:||18 Jul 2012 03:42|
|Last Modified:||06 Aug 2012 07:00|
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