Assessing the environmental availability of sulfamethoxazole and its acetylated metabolite in agricultural soils amended with compost and manure: an experimental and modeling study
Résumé
The recycling of sludge compost and farmyard manure in agriculture can lead to the introduction of sulfonamide
antibiotics and their acetylated metabolites into soils. The quality and the biodegradability of the exogenous
organic matter (EOM) containing antibiotic residues is determinant for their environmental availability and fate
in soils (Goulas et al., 2016). This study combined experimental and modeling approaches in order to: 1) assess
the fraction of sulfamethoxazole (SMX) and N-acetyl-sulfamethoxazole (AcSMX) available in EOM-amended
soils by using soft extractions (CaCl2, EDTA or cyclodextrin solutions) during a 28-day incubation; and 2) better
understand the dynamics of sulfonamide residues in amended soils in connection with their availability and the
mineralization of EOM organic matter thanks to the COP-Soil model (Geng et al. 2015). This model proposes
several options to couple the biotransformation of organic pollutants (OP) with the decomposition of EOM in soil.
The microbial degradation can be simulated by co-metabolism and specific-metabolism. The model also accounts
for the formation of non-extractable residues (NER) via both physicochemical and microbial routes
Domaines
Sciences du Vivant [q-bio]
Origine : Fichiers produits par l'(les) auteur(s)
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