Chinese Academy of Sciences
Anthropogenic production of reactive nitrogen (N) is increasing rapidly due to the growing demand for food production. Rivers are the receptors of N, especially nitrate (NO3-), produced in their drainage catchments, therefore, quantifying catchment-scale NO3- sources and transformations is vital for understanding the global biogeochemical cycles of N and for remediating river NO3- pollution.
Historically, natural abundance isotopic compositions of NO3- (δ15N/δ18O-NO3-) in a river have been used to reveal catchment-scale NO3- sources and removal, and molecular techniques and 15N pairing experiments can quantify NO3-
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