Atmospheric Oxidation of a Thiocarbamate Herbicide Used in Winter Cereals

The gas-phase atmospheric degradation of prosulfocarb (a widely used thiocarbamate herbicide in winter cereals) at different NOx concentrations was investigated at the large outdoor European PHOtoREactor (EUPHORE) in Valencia, Spain. Photolysis under sunlight conditions and reaction with ozone were...

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Bibliographic Details
Published in:Environmental science & technology 2018-08, Vol.52 (16), p.9136-9144
Main Authors: Muñoz, Amalia, Borrás, Esther, Ródenas, Milagros, Vera, Teresa, Pedersen, Hans Albert
Format: Article
Language:English
Subjects:
Aerosols
Benzaldehyde
Cereals
Free radicals
Herbicides
Oxidation
Ozone
Photolysis
Radicals
Winter
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Summary:The gas-phase atmospheric degradation of prosulfocarb (a widely used thiocarbamate herbicide in winter cereals) at different NOx concentrations was investigated at the large outdoor European PHOtoREactor (EUPHORE) in Valencia, Spain. Photolysis under sunlight conditions and reaction with ozone were shown as unimportant. The rate constant for the reaction of prosulfocarb with OH radicals was determined as k = (2.9 ± 0.5) × 10–11 cm3 molecule–1 s–1 at 288 ± 10 K and atmospheric pressure by a conventional relative rate method. Significant ozone and aerosol formation was observed following the reaction of prosulfocarb with OH radicals, and the main detected carbon-containing gas-phase products were benzaldehyde, S-benzyl formyl­(propyl)­carbamothioate, and S-benzyl propanoyl­(propyl)­carbamothioate.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.8b02157