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Acetochlor mineralization and fate of its two major metabolites in two soils under laboratory conditions

Abstract : The degradation of the herbicide acetochlor, in a neoluvisol and in a calcosol were studied as a function of depth (0-25 cm and 25-50 cm) and temperature (25 °C and 15 °C) under controlled laboratory conditions during 58 and 90 days, respectively. The surface and sub-surface soil samples were respectively spiked with 1 and 0.01 mg kg−1 of 14C-acetochlor, the concentrations observed in previous field monitoring. The half-lives (DT50) varied from 1.4 to 14.9 days depending on the soil, temperature and applied concentration. The maximal mineralization (24%) was observed for the surface calcosol at 25 °C. The comparison of results obtained for sterilized and non-sterilized soils, the decrease of DT50 with the increase of temperature, the shape of CO2 emissions and the increase of number of aerobic endogenous microflora through the experiment suggested that biological process are dominant in degradation. A particular attention was paid to the formation and dissipation of metabolites ESA (ethanesulphonic acid) and OA (oxanilic acid) during the whole experiment. At 25 °C, ESA and OA were observed after three days, but as ESA concentration decreased over time in surface calcosol, it remained constant in surface neoluvisol. A difference in ESA/OA ratio depends on the soil with a predominance of OA in surface neoluvisol and a disappearance of OA in surface calcosol.
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Soumis le : mercredi 16 novembre 2011 - 15:40:32
Dernière modification le : jeudi 30 avril 2020 - 14:46:07

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Marie Christine Dictor, Nicole Baran, Anne Gautier, Christophe Mouvet. Acetochlor mineralization and fate of its two major metabolites in two soils under laboratory conditions. Chemosphere, Elsevier, 2008, 71 (4), pp.663-670. ⟨10.1016/j.chemosphere.2007.10.066⟩. ⟨hal-00641763⟩

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