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Abstract

Aciofluorfen was irradiated in pure water at various excitation wavelenghts and pH values. Numerous photoproducs were obtained which were identified by (lH)NMR and/or HPCL-MS/MS. The main reaction pathways were photo-decarboxylation, photo-cleavage of the ether bonding with formation of phenolic compunds, photo-dechlorination and photo-Claisen type rearrangement. Decarboxylation was observed in acidic and neutral media whereas cleavage of the ether bonding dominated in basic media. The photo-Claisen type rearrangement only occurred on excitation at short wavelengths. The quantum yield of photolysis was significantly lower at 3l3nm (6.1x10-5) than at 254nm (2.0xlO-3) .The photoreactivity of acifluorfen was then studied in conditions approaching environmental conditions. Acifluorfen was dissolved in pure water, in water containing humic substances or in a natural water, and exposed to solar light.

Additional information

Authors: VIALATON D, Laboratoire de Photochimie Moleculaire et Macromoleculaire, UMS CNRS, Cedex (FR);RICHARD C, Laboratoire de Photochimie Moleculaire et Macromoleculaire, UMS CNRS, Cedex (FR);BAGLIO D, EC Environment Institute, Ispra (IT);PAYA-PEREZ A, EC Institute for Health and Consumer Protection (IHCP), JRC, Ispra (IT)
Bibliographic Reference: An article published in: Pest Management Science 57(2001) pp.372-379
Record Number: 200013554 / Last updated on: 2001-07-25
Category: PUBLICATION
Original language: en
Available languages: en