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Brienza Monica, Duwig Céline, Perez S., Chiron Serge. (2017). 4-nitroso-sulfamethoxazole generation in soil under denitrifying conditions : field observations versus laboratory results. Journal of Hazardous Materials, 334, 185-192. ISSN 0304-3894

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Lien direct chez l'éditeur doi:10.1016/j.jhazmat.2017.04.015

Titre
4-nitroso-sulfamethoxazole generation in soil under denitrifying conditions : field observations versus laboratory results
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000401375700021
AuteursBrienza Monica, Duwig Céline, Perez S., Chiron Serge.
SourceJournal of Hazardous Materials, 2017, 334, p. 185-192. ISSN 0304-3894
RésuméThe formation of 4-nitroso-sulfamethoxazole and 4-nitro-SMX, two transformation products (TPs) of sulfamethoxazole (SMX) was investigated under batch soil slurry experiments and in a field study. Due to their low occurrence levels (ng/L) in environmental waters, a suitable analytical method based on liquid chromatography - high resolution - mass spectrometry was developed. Consequently, field observations revealed, for the first time, the occurrence of 4-nitroso-SMX in groundwater at concentrations as high as 18 ng/L.Nitric oxide (NO center dot) steady-state concentrations were determined in soil slurry experiments because this reactive specie accounted for the formation of 4-nitroso-SMX and 4-nitro-SMX. Measurements revealed that environmental SMX concentrations (0.2-2 mu g/L) at neutral pH induced the accumulation of nitric oxide. Under acidic conditions (pH< 6), nitrous acid (HONO) was the major source of nitric oxide while under neutral/basic conditions nitric oxide release was related to the inhibition of denitrification processes. Under laboratory experiments, SMX nitration reaction appeared to be an irreversible transformation pathway, while 4-nitroso-SMX was slowly transformed over time. The occurrence of 4-nitroso-SMX conditions was therefore unexpected in the field study but could be due to its continuous input from soil and/or its relative persistence under anoxic conditions. A mechanism for 4-nitroso-SMX formation was proposed involving a nitrosative desamination pathway through a phenyl radical.
Plan de classementHydrologie [062] ; Pollution [038] ; Pédologie [068] ; Sciences du milieu [021]
Descr. géo.BOLIVIE
LocalisationFonds IRD [F B010070055]
Identifiant IRDfdi:010070055
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070055

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