Suppression of chlorothalonil degradation in soil after repeated application

Autor:	Kei Motonaga, Kazuhiro Takagi, Satoshi Matumoto
Rok vydání:	1998
Předmět:	Chlorothalonil Ecology Health Toxicology and Mutagenesis Metabolite Cometabolism Biodegradation Pesticide complex mixtures Soil contamination Soil respiration chemistry.chemical_compound chemistry Dry weight Environmental chemistry Environmental Chemistry
Zdroj:	Environmental Toxicology and Chemistry. 17:1469-1472
ISSN:	1552-8618 0730-7268
DOI:	10.1002/etc.5620170806
Popis:	Mechanisms of degradation suppression of chlorothalonil after repeated application were investigated. Under laboratory conditions, soil was treated sequentially with 40 mg/kg dry weight of chlorothalonil. This resulted in the degradation suppression of chlorothalonil and accumulation of the metabolite 4-hydroxy-2,5,6-trichloroisophthalonitrile (TPN-OH) in soil. After pretreatment with three kinds of chlorothalonil metabolite, only TPN-OH was found to suppress chlorothalonil degradation in soil. After the pretreatment of TPN-OH, residual chlorothalonil in soil at 1 week after application was 9 to 11% higher than those with pretreatment with other metabolites and control. The TPN-OH pretreatment also suppressed soil respiration and TPN-OH was more persistent in soil than chlorothalonil, indicating that toxicity of residual TPN-OH may suppress the degradation of chlorothalonil in soil.
Databáze:	OpenAIRE
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