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.
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.
Mallat
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Department of Environmental Chemistry, CID-CSIC, Barcelona, Spain.
Barceló
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D
D002852:Chromatography, Ion Exchange / Q000379:methods*; D004355:Drug Stability; D004784:Environmental Monitoring; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D009943:Organophosphorus Compounds / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity; D013696:Temperature; D014867:Water / Q000032:analysis*; D000097797:Glyphosate
D005998:Glycine; D006540:Herbicides; D009943:Organophosphorus Compounds; D014867:Water; D000097797:Glyphosate; C036423:1-aminomethylphosphonic acid