Separation and characterization of dimethoate metabolites developing in soil and alkaline solution

Autor:	J. V. Wheelock, D. E. Cotton, I. O. D. El Beit
Rok vydání:	1978
Předmět:	chemistry.chemical_classification Chromatography Ecology Carboxylic acid Geography Planning and Development Desmethyl Pollution Esterase Hydrolysis chemistry.chemical_compound Enzyme chemistry Computers in Earth Sciences Thiophosphoric acid Waste Management and Disposal Dimethoate Phosphoric acid
Zdroj:	International Journal of Environmental Studies. 12:215-225
ISSN:	1029-0400 0020-7233
DOI:	10.1080/00207237808709784
Popis:	The investigation has shown that the thin‐layer chromatographic technique is efficient in separating mixtures of dimethoate metabolites from soil extracts. Nine metabolites were isolated, six were positively identified as O, desmethyl dimethoate, dimethoate carboxylic acid, dimethyl dithiophosphoric acid, dimethyl thiophosphoric acid, dimethyl phosphoric acid and phosphoric acid. The remaining three were tentatively identified as two isomers of O, desmethyl‐oxycarboxy derivative and O, desmethylthiocarboxy derivative. All these metabolities inhibit the esterase enzyme of beef liver homogenate. Degradation of dimethoate in soil and solution is affected by hydrolysis followed by oxidation or oxidation followed by hydrolysis, resulting in dimethylphosphoric and/or phosphoric acids as the final degradation products. A proposed pathway of dimethoate degradation in the soil is outlined.
Databáze:	OpenAIRE
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