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- W590404553 abstract "This chapter focuses on phototransformations of dissolved organic nitrogen (DON). Photochemical reactions play an important role in the transformations of organic matter. Most studies in this respect have focused on organic carbon. However, photochemical reactions are not restricted to carbon, but also affect other elements including nitrogen, sulfur, phosphorus, and metals. A number of organic compounds have been identified as products of DON photodegradation. They are characterized in bulk as amines measured as fluorescent ortho-phtaldialdehyde derivatives. Since most of the organic nitrogen is of limited bioavailability to autotrophs, photochemical transformation of recalcitrant DON into bioavailable forms implies an important (and unaccounted for) potential source of assimilable nitrogen. Bioassays have been employed to estimate how photochemical reactions change the availability of organic substances for bacterial growth. In this way, information is gained on the environmental role of photoproducts even though their identity and concentration remain unknown. This approach has yielded a large body of results on photochemical effects on dissolved organic carbon bioavailability. The interest in environmental photochemistry is additionally stimulated by the awareness of an increasing flux of harmful UVB radiation due to stratospheric ozone depletion. As a consequence, there has been a sizable increase in the number of publications concerning interactions between sunlight and both biotic and abiotic components of aquatic environments." @default.
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- W590404553 date "2008-01-01" @default.
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- W590404553 title "Phototransformations of Dissolved Organic Nitrogen" @default.
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- W590404553 doi "https://doi.org/10.1016/b978-0-12-372522-6.00010-4" @default.
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