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- W2024891279 abstract "The photoinduced degradation of carbaryl (1-naphthyl-N-methyl carbamate) was studied in a wetland's surface water to examine the photochemical processes influencing its transformation. For this particular wetland water, at high pH, it was difficult to delineate the photolytic contribution to the overall degradation of carbaryl. At lower pH values, the extent of the degradation attributable to indirect pathways, that is, in the presence of naturally occurring photosensitizers, increased significantly. Moreover, the photoenhanced degradation at the lower pH values was found to be seasonally and spatially dependent. Analysis of water samples revealed two primary constituents responsible for the observed indirect photolytic processes: nitrate and dissolved natural organic matter (NOM). Nitrate in the wetland appears at high concentrations (≥1 mM) seasonally after the application of fertilizers in the watershed and promotes contaminant destruction through the photochemical production of the hydroxyl radical (HO•). The extent of the observed indirect photolysis pathway appears to be dependent upon the concentration of nitrates and the presence of HO• scavengers such as dissolved NOM and carbonate alkalinity. Paradoxically, during low-nitrate events (<50 μM), NOM becomes the principal photosensitizer through either the production of HO•, direct energy transfer from the excited triplet state, and/or production of an unidentified transient species. Keywords: Photolysis; carbaryl; natural organic matter; nitrate" @default.
- W2024891279 created "2016-06-24" @default.
- W2024891279 creator A5006565721 @default.
- W2024891279 creator A5022632017 @default.
- W2024891279 date "2002-10-11" @default.
- W2024891279 modified "2023-10-12" @default.
- W2024891279 title "Photoinduced Degradation of Carbaryl in a Wetland Surface Water" @default.
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- W2024891279 doi "https://doi.org/10.1021/jf025545m" @default.
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