Add time:07/12/2019         Source:sciencedirect.com

SummaryHalflife times of chemical and metabolic degradation are given in buffer solutions and plants of butonate, trichlorphone, dichlorvos and their metabolites, and on plant and glass surfaces including evaporation of volatile compunds. In aqueous nonbiological media butonate is degraded at pH < 5.5 to trichlorphone, demethyl trichlorphone and demethyl butonate, at pH > 5.5 preferably to the new metabolite vinylbutonate, demethylbutonate and demethyl vinylbutonate with traces of trichlorphone. Formation of dichlorvos is possible in traces only, according to the range of pH.In plants butonate is metabolized by deacylation via trichlorphone and demethyl trichlorphone with dichlorvos as a minor metabolite and by demethylation via demethyl butonate. No vinylbutonate as degradation product was found in plants.Evaporation from plant surface is increasing in the order trichlorphone < butonate < dichlorvos, which is a minor part of evaporating insecticidal compounds following spraying of butonate, and the only evaporating compound from plants sprayed with trichlorphone. Photodegradation following 5 h uv-irradiation on glass plates is more expressed than 20 h sunlight irradiation and is preferred for dichlorvos (100 and 75% in relation to butonate (30 and 2%) and trichlorphone (7 and 6%).TLC separation and detection methods are given of the compounds investigated and their metabolites; analytical methods were two phase partition, TLC scanning and autoradiography of 32P-labelled compounds. Metabolites not containing 32P were not analysed.

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