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Glyphosate (GLYP), the globally most important herbicide, may have effects in various compartments of the environment such as soil and water. Although laboratory studies showed fast microbial degradation and a low leaching potential, it is often detected in various environmental compartments, but pathways are unknown. Therefore, the objective was to study GLYP leaching and transformations in a lysimeter field experiment over a study period of one hydrological year using non-radioactive  13 C 2 - 15 N-GLYP labelling and maize cultivation.  15 N and  13 C were selectively measured using isotopic ratio mass spectrometry (IR-MS) in leachates, soil, and plant material. Additionally, HPLC coupled to tandem mass spectrometry (HPLC-MS/MS) was used for quantitation of GLYP and its main degradation product aminomethylphosphonic acid (AMPA) in different environmental compartments (leachates and soil). Results show low recoveries for GLYP (< 3%) and AMPA (< level of detection) in soil after the study period, whereas recoveries of  15 N (11–19%) and  13 C (23–54%) were higher. Time independent enrichment of  15 N and  13 C and the absence of GLYP and AMPA in leachates indicated further degradation.  15 N was enriched in all compartments of maize plants (roots, shoots, and cobs).  13 C was only enriched in roots. Results confirmed rapid degradation to further degradation products, e.g.,  15 NH 4  + , which plausibly was taken up as nutrient by plants. Due to the discrepancy of low GLYP and AMPA concentrations in soil, but higher values for  15 N and  13 C after the study period, it cannot be excluded that non-extractable residues of GLYP remained and accumulated in soil.   Electronic supplementary material  The online version of this article (10.1007/s10661-019-8045-4) contains supplementary material, which is available to authorized users.

Leaching and degradation of 13C2-15N-glyphosate in field lysimeters