The behavior of the herbicide glyphosate and its main metabolite aminomethylphosphonic acid (AMPA) was investigated in soils and water in a well-defined catchment of the reservoir Radeburg II near Dresden (Saxony/Germany). The half-life of glyphosate in soil ranged from 11 to 17 days. Glyphosate and AMPA completely disappeared from soil after about 5 months following application of the products ”︁Roundup Ultra” and ”︁Touchdown”. The aquatic system in the test areas (surface water, soil solution, and groundwater) was not significantly affected by direct application of the compound. In general, there was a clear indication of strong sorption of the two substances by soil particles. Settlement areas were recognized as possible sources of glyphosate and AMPA intake in aquatic systems.
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Grunewald et al. (2001) studied this question.
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