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- W2339160332 abstract "Glyphosate and its metabolite aminomethylphosphonic acid (AMPA) are frequently detected in water and sediments. Up to date, there are no comprehensive studies on the fate of glyphosate in water-sediment microcosms according to OECD 308 guideline. Stable isotope co-labeled 13C315N-glyphosate was used to determine the turnover mass balance, formation of metabolites, and formation of residues over a period of 80 days. In the water-sediment system, 56% of the initial 13C3-glyphosate equivalents was ultimately mineralized, whereas the mineralization in the water system (without sediment) was low, reaching only 2% of 13C-glyphosate equivalents. This finding demonstrates the key role of sediments in its degradation. Glyphosate was detected below detection limit in the water compartment on day 40, but could still be detected in the sediments, ultimately reaching 5% of 13C315N-glyphosate equivalents. A rapid increase in 13C15N-AMPA was noted after 10 days, and these transformation products ultimately constituted 26% of the 13C3-glyphosate equivalents and 79% of the 15N-glyphosate equivalents. In total, 10% of the 13C label and 12% of the 15N label were incorporated into amino acids, indicating no risk bearing biogenic residue formation from 13C315N-glyphosate. Initially, glyphosate was biodegraded via the sarcosine pathway related to microbial growth, as shown by co-labeled 13C15N-glycine and biogenic residue formation. Later, degradation via AMPA dominated under starvation conditions, as shown by the contents of 13C-glycine. The presented data provide the first evidence of the speciation of the non-extractable residues as well as the utilization of glyphosate as a carbon and nitrogen source in the water-sediment system. This study also highlights the contribution of both the sarcosine and the AMPA degradation pathways under these conditions." @default.
- W2339160332 created "2016-06-24" @default.
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- W2339160332 date "2016-08-01" @default.
- W2339160332 modified "2023-10-18" @default.
- W2339160332 title "(Bio)degradation of glyphosate in water-sediment microcosms – A stable isotope co-labeling approach" @default.
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- W2339160332 doi "https://doi.org/10.1016/j.watres.2016.04.041" @default.
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