期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 65, 期 15, 页码 3103-3108出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b00134
关键词
indirect photolysis; dissolved organic matter; reactive oxygen species; herbicide; imazosulfuron
资金
- California Rice Research Board [RP-5]
- Donald G. Crosby Endowed Chair in Environmental Chemistry
Imazosulfuron, a sulfonylurea herbicide used in rice cultivation, has been shown to undergo photodegradation in water, but neither the photochemical mechanism nor the role of indirect photolysis is known. The purpose of this study was to investigate the underlying processes that operate on imazosulfuron during aqueous photodegradation. Our data indicate that in the presence of oxygen, most photochemical degradation proceeds through a direct singlet-excited state pathway whereas triplet excited state imazosulfuron enhanced decay rates under low dissolved oxygen conditions. Oxidation by hydroxyl radical and singlet oxygen were not significant. At dissolved organic matter (DOM) concentrations reprsentative of rice field conditions, fulvic acid solutions exhibited faster degradation than rice field water containing both humic and fulvic acid fractions. Both enhancement, via reaction with triplet-state DOM, and inhibition, via competition for photons, of degradation was observed in. DOM solutions.
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