Photodegradation of dichloran, 2,6-dichloro-4-nitroaniline, a fungicide used to control fungi diseases on fruits and vegetables due to Botrytis, Monilia, Rhizopus, Sclerotinia, has been investigated. In distilled water as well as in the water sampled from the lake Pamvotis (Greece) the fungicide follows a first order reaction kinetics although with different half-lives: 117 and 74 h, respectively. To better understand the ecological behaviour of this chemical, the acute toxicity of photodegradation intermediates has been evaluated on Daphnia magna (freshwater crustacean, water flea), Vibrio fischeri bacteria (Microtox) and Lactuca sativa. The toxicity tests evidenced that the mixture of dichloran by-products was more toxic than the pure active compound.
Photochemical transformation and toxicity of dichloran in pure water and water sampled from lake Pamvotis
SCRANO, Laura;LELARIO, FILOMENA;BUFO, Sabino Aurelio
2008-01-01
Abstract
Photodegradation of dichloran, 2,6-dichloro-4-nitroaniline, a fungicide used to control fungi diseases on fruits and vegetables due to Botrytis, Monilia, Rhizopus, Sclerotinia, has been investigated. In distilled water as well as in the water sampled from the lake Pamvotis (Greece) the fungicide follows a first order reaction kinetics although with different half-lives: 117 and 74 h, respectively. To better understand the ecological behaviour of this chemical, the acute toxicity of photodegradation intermediates has been evaluated on Daphnia magna (freshwater crustacean, water flea), Vibrio fischeri bacteria (Microtox) and Lactuca sativa. The toxicity tests evidenced that the mixture of dichloran by-products was more toxic than the pure active compound.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
