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Direct and indirect photolysis of cyhalofop in aqueous systems

Pinna, Maria Vittoria and Pusino, Alba (2011) Direct and indirect photolysis of cyhalofop in aqueous systems. Chemosphere, Vol. 82 (6), p. 817-821. eISSN 1879-1298. Article.

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DOI: 10.1016/j.chemosphere.2010.11.031

Abstract

The photodegradation of the aryloxyphenoxy propionic herbicide cyhalofop-butyl (2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]butylpropanoate (CyB), and of its primary metabolite (2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]propanoic acid (CyA) was studied in water at different irradiation wavelengths. The sunlight irradiation was investigated also in the presence of humic acid (HA), Fe oxide, titanium dioxide (TiO2) and zinc oxide (ZnO) as photocatalysts.
CyB and CyA were rapidly degraded by UV irradiation. CyB afforded the butyl ester of 2-[3-(4-cyano-2-fluorophenyl)-4-hydroxy-phenoxy]propanoic acid (CyI), a metabolite arising from a photo-Fries rearrangement. Instead, CyA yielded (R)-2-4-(4-carboxyl-2-fluorophenoxy)phenoxypropanoic acid (CyD), a dicarboxylic acid arising from the photo-hydrolysis of cyano group via amide. CyB was stable in simulated sunlight also in the presence of the catalysts tested.
The irradiation of a CyA solution, in the presence of HA or Fe oxide, with simulated sunlight did not produce any significant degradation. In the same experimental conditions, CyA was totally mineralized in the presence of TiO2 and ZnO.

Item Type:Article
ID Code:5459
Status:Published
Refereed:Yes
Uncontrolled Keywords:Cyhalofop, photodegradation, Humic acid, Fe-oxide, TiO2, ZnO
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier
eISSN:1879-1298
Copyright Holders:© 2010 Elsevier
Deposited On:18 Feb 2011 13:34

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