Degradation of esfenvalerate in illuminated water-sediment system

• Published in: Journal of Pesticide Science Vol. 34; no. 1; pp. 27 - 36
• Main Authors: Kodaka, R.(Sumitomo Chemical Co. Ltd., Takarazuka, Hyogo (Japan)), Sugano, T, Katagi, T
• Format: Journal Article
• Language: English; Japanese
• Published: Tokyo Pesticide Science Society of Japan 01.01.2009; Japan Academic Association for Copyright Clearance; Japan Science and Technology Agency
• Subjects: BIODEGRADACION; BIODEGRADATION; biodegradation of pesticides; Biological and medical sciences; esfenvalerate; FENVALERATE; FENVALERATO; Freshwater; Fundamental and applied biological sciences. Psychology; INSECTICIDAS; INSECTICIDE; INSECTICIDES; INTERFACE SEDIMENT EAU; INTERFASE SEDIMENTO AGUA; LIGHT REGIMES; Phytopathology. Animal pests. Plant and forest protection; PIRETRINAS SINTETICAS; PYRETHRINE DE SYNTESE; REGIME LUMINEUX; REGIMENES DE LUZ; SEDIMENT WATER INTERFACE; SYNTHETIC PYRETHRINS; water-sediment system; Japan; Biodegradation; Water; Insecticide; esfenvalerate; water-sediment system; Pesticides; Pyrethroids; biodegradation of pesticides; Sediments; System
• ISSN: 1348-589X; 1349-0923
• DOI: 10.1584/jpestics.G08-23

The aerobic aquatic soil metabolism of esfenvalerate [(2S, alphaS)-alpha-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)-3-methylbutyrate] was examined in two Japanese pond water-sediment systems in relation to the effects of illumination and formulation on degradation profiles. Esfenvalerate was rapidly partitioned from the water phase to the bottom sediments with dissipation half-lives of less than 1 day and either the application of formulation or illumination slightly accelerated the partition. The main degradate of esfenvalerate was 3-phenoxybenzoic acid via ester cleavage both under dark and light conditions. The epimerization at the alpha-cyanobenzyl carbon significantly proceeded to form the corresponding [2S, alphaR] isomer in both water and sediment. The possible degradate via photo-induced decarboxylation was scarcely detected in the water phase of the illuminated water-sediment systems.