Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1035, Issue 1, Pages 153-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.02.044
Keywords
water analysis; glyphosate; ammomethylphosphonic acid; pesticides
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An existing method for the determination of glyphosate and its main metabolite aminomethylphosphonic acid (AMPA) in water has been improved. It is based on precolumn derivatization with the fluorescent reagent 9-fluorenylmethylcloroformate (FMOC) followed by large-volume injection in a coupled-column LC system using fluorescence detection (LC-LC-FD). The derivatization step was slightly modified by changing parameters such as volume and/or concentration of sample and reagents to decrease the limits of quantification (LOQ) of glyphosate and AMPA to 0.1 mug/l. Additionally, the use of Amberlite((R)) IRA-900 for preconcentration of glyphosate, prior to the derivatization step, was investigated; the LOQ of glyphosate was lowered to 0.02 mug/l. Drinking, surface and ground water spiked with glyphosate and AMPA at 0.1-10 mug/l concentrations were analysed by the improved LC-LC-FD method. Recoveries were 87-106% with relative standard deviations lower than 8%. Drinking and ground water spiked with glyphosate at 0.02 and 0.1 mug/l were analysed after preconcentration on the anion-exchange resin with satisfactory recoveries (94-105%) and precision (better than 8%). (C) 2004 Elsevier B.V. All rights reserved.
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