Photochemical transformation of acifluorofen under laboratory and natural conditions
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.
Bibliographic Reference: An article published in: Pest Management Science 57(2001) pp.372-379
Record Number: 200013554 / Last updated on: 2001-07-25
Original language: en
Available languages: en