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Analysis and degradation study of glyphosate and of aminomethylphosphonic acid in natural waters by means of polymeric and ion-exchange solid-phase extraction columns followed by ion chromatography-post-column derivatization with fluorescence detection.

Journal of chromatography. A (1998-11-18)
E Mallat, D Barceló
ABSTRACT

The quantitative trace determination of glyphosate and its major metabolite, aminophosphonic acid (AMPA) in natural waters was achieved by means of ion-exchange chromatography. Fifty ml of natural water sample was preconcentrated by a two-step procedure: first the sample was percolated through a polymeric cartridge, LiChrolut EN, then through an anion-exchange column mechanism, and finally analyzed by ion-exchange chromatography followed by post-column reaction coupled to a fluorimetric detector. Linear calibration graphs were obtained between 5 and 200 micrograms l-1. Limits of detection ranged from 2 micrograms l-1 of glyphosate and 4 micrograms l-1 of AMPA. A study of the degradation of glyphosate in environmental waters under characteristic conditions was carried out to figure out the main degradation pathways of this compound. Half-lives of glyphosate varied from 60 h for ground water samples exposed to sunlight to 770 h for those stored under dark conditions.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
(Aminomethyl)phosphonic acid, 99%
Supelco
(Aminomethyl)phosphonic acid, analytical standard

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