Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants and Agricultural Wastes 1980-01-01

Effects of paddy water and some photosensitizers on the photolysis of the fungicide isoprothiolane.

S S Chou, M Eto

Index: J. Environ. Sci. Health B 15(2) , 135-46, (1980)

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Abstract

The fungicide isoprothiolane (diisopropyl 1,3-dithiolan-2-ylidenemalonate) decomposed slowly in deionized water under ultraviolet light or sunlight irradiation. Rice-paddy water greatly accelerated the photodegradation. This photosensitizing effect was comparable to that of 2% acetone. Soil extracts, rice-plant extracts, and chlorophylls showed little effect for the isoprothiolane photolysis. Tryptophan showed a relatively weak accelerating effect after a considerable lag time. Riboflavin exerted a remarkable acceleration of the photolysis. This effect was suppressed by a nitrogen gas stream.