Publications des scientifiques de l'IRD

Chiron Serge, Duwig Céline. (2016). Biotic nitrosation of diclofenac in a soil aquifer system (Katari watershed, Bolivia). Science of the Total Environment, 565, p. 473-480. ISSN 0048-9697.

Titre du document
Biotic nitrosation of diclofenac in a soil aquifer system (Katari watershed, Bolivia)
Année de publication
2016
Type de document
Article référencé dans le Web of Science WOS:000378206300046
Auteurs
Chiron Serge, Duwig Céline
Source
Science of the Total Environment, 2016, 565, p. 473-480 ISSN 0048-9697
Up till now, the diclofenac (DCF) transformation into its nitrogen-derivatives, N-nitroso-DCF (NO-DCF) and 5-nitro-DCF (NO2-DCF), has been mainly investigated in waste water treatment plant under nitrification or denitrification processes. This work reports, for the first time, an additional DCF microbial mediated nitrosation pathway of DCF in soil under strictly anoxic conditions probably involving codenitrification processes and fungal activities. This transformation pathway was investigated by using field observations data at a soil aquifer system (Katari watershed, Bolivia) and by carrying out soil slurry batch experiments. It was also observed for diphenylamine (DPA). Field measurements revealed the occurrence of NO-DCF, NO2-DCF and NO-DPA in groundwater samples at concentration levels in the 6-68 s/L range. These concentration levels are more significant than those previously reported in waste water treatment plant effluents taking into account dilution processes in soil. Interestingly, the p-benzoquinone imine of 5-OH-DCF was also found to be rather stable in surface water. In laboratory batch experiments under strictly anoxic conditions, the transformation of DCF and DPA into their corresponding N-nitroso derivatives was well correlated to denitrification processes. It was also observed that NO-DCF evolved into NO2-DCF while NO-DPA was stable. In vitro experiments showed that the Fisher-Hepp rearrangement could not account for NO2-DCF formation. One possible mechanism might be that NO-DCF underwent spontaneous NO loss to give the resulting intermediates diphenylaminyl radical or nitrenium cation which might evolve into NO2-DCF in presence of NO2 radical or nitrite ion, respectively.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Pollution [038] ; Hydrologie [062] ; Pédologie [068]
Description Géographique
BOLIVIE
Localisation
Fonds IRD [F B010067615]
Identifiant IRD
fdi:010067615
Contact