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- W2316605557 abstract "In the following study, we addressed the effects of photoirradiation on the turnover of dissolved organic nitrogen (DON) from both natural and anthropogenic sources at the molecular level. Analysis of long-term photoirradiated samples via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) identified both the photolabile and the photoproduced DON from both natural and anthropogenic sources. Although photoproduction of DON was prominent with natural dissolved organic matter (DOM) sources, even in a low nitrogen environment, the anthropogenic source shows a shift from photobleaching to photohumification denoted by an increase in the average molecular weight (MW) and the double bound equivalent (DBE) after 25 days of a continuous exposure to UV light, implying condensation of low MW molecules (LMW) to form high MW (HMW) molecules. Furthermore, the sharp increase in N/C molar ratio, in the anthropogenic source, substantiates the photoinduced dissolved inorganic nitrogen (DIN) incorporation hypothesis. Hence, our findings suggest that anthropogenic input will drive substantial variation in riverine DOM and, thus, estuarine optics and photochemistry and bioavailability. Furthermore, we validate that photochemistry is one of the main processes that shapes the DON quality in aquatic systems regardless of its original source." @default.
- W2316605557 created "2016-06-24" @default.
- W2316605557 creator A5037584353 @default.
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- W2316605557 date "2014-12-16" @default.
- W2316605557 modified "2023-10-02" @default.
- W2316605557 title "Photochemical Alterations of Natural and Anthropogenic Dissolved Organic Nitrogen in the York River" @default.
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- W2316605557 doi "https://doi.org/10.1021/es504095c" @default.
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