title: Effects of paddy water and some photosensitizers on the photolysis of the fungicide isoprothiolane.
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.
mesh_terms: D000096:Acetone; D002734:Chlorophyll; D005659:Fungicides, Industrial / Q000528:radiation effects*; D008314:Malonates / Q000528:radiation effects*; D012275:Oryza; D010782:Photolysis; D012256:Riboflavin; D012987:Soil; D013472:Sunlight; D013876:Thiophenes / Q000528:radiation effects*; D014364:Tryptophan; D014466:Ultraviolet Rays; D014867:Water
chemical_list: D005659:Fungicides, Industrial; D008314:Malonates; D012987:Soil; D013876:Thiophenes; D014867:Water; D000096:Acetone; D002734:Chlorophyll; C023889:isoprothiolane; D014364:Tryptophan; D012256:Riboflavin