Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 15, Pages 3103-3108Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b00134
Keywords
indirect photolysis; dissolved organic matter; reactive oxygen species; herbicide; imazosulfuron
Funding
- California Rice Research Board [RP-5]
- Donald G. Crosby Endowed Chair in Environmental Chemistry
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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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