Mechanistic modeling indicates rapid glyphosate dissipation and sorption-driven persistence of its metabolite AMPA in soil.
Autor: | Wimmer B; Institute of Physical and Theoretical Chemistry, Eberhard Karls Univ., Tübingen, Germany., Langarica-Fuentes A; Center for Applied Geosciences/Geo- and Environmental Research Center, Eberhard Karls Univ., Tübingen, Germany., Schwarz E; Dep. of Biogeophysics, Institute of Soil Science and Land Evaluation, Univ. of Hohenheim, Stuttgart, Germany.; Dep. of Physical Geography and Bolin Centre for Climate Research, Stockholm Univ., Stockholm, Sweden., Kleindienst S; Center for Applied Geosciences/Geo- and Environmental Research Center, Eberhard Karls Univ., Tübingen, Germany.; Dep. of Environmental Microbiology, Institute for Sanitary Engineering, Water Quality and Solid Waste Management (ISWA), Univ. of Stuttgart, Stuttgart, Germany., Huhn C; Institute of Physical and Theoretical Chemistry, Eberhard Karls Univ., Tübingen, Germany., Pagel H; Dep. of Biogeophysics, Institute of Soil Science and Land Evaluation, Univ. of Hohenheim, Stuttgart, Germany. |
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Jazyk: | angličtina |
Zdroj: | Journal of environmental quality [J Environ Qual] 2023 Mar; Vol. 52 (2), pp. 393-405. Date of Electronic Publication: 2023 Jan 17. |
DOI: | 10.1002/jeq2.20437 |
Abstrakt: | Residual concentrations of glyphosate and its main transformation product aminomethylphosphonic acid (AMPA) are often observed in soils. The factors controlling their biodegradation are currently not well understood. We analyzed sorption-limited biodegradation of glyphosate and AMPA in soil with a set of microcosm experiments. A mechanistic model that accounts for equilibrium and kinetic sorption facilitated interpretation of the experimental results. Both compounds showed a biphasic dissipation with an initial fast (up to Days 7-10) and subsequent slower transformation rate, pointing to sorption-limited degradation. Glyphosate transformation was well described by considering only equilibrium sorption. Model simulations suggested that only 0.02-0.13% of total glyphosate was present in the soil solution and thus bioavailable. Glyphosate transformation was rapid in solution (time required for 50 % dissipation of the total initially added chemical [DT (© 2022 The Authors. Journal of Environmental Quality © 2022 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.) |
Databáze: | MEDLINE |
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