alexa Tracing the sources of nitrate in the Han River watershed in Korea, using δ15N-NO3− and δ18O-NO3− values
Environmental Sciences

Environmental Sciences

Journal of Pollution Effects & Control

Author(s): KwangSik Lee, YeonSik Bong, Dongho Lee, Yongje Kim, Kangjoo Kim

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The dissolved nitrate concentrations and their nitrogen and oxygen isotopic ratios were analyzed in seasonal samples from Korea's Han River to ascertain the seasonal and spatial variations of dissolved nitrate and its possible sources. Nitrate concentrations in the South Han River (SHR) were much higher than those in the North Han River (NHR), probably because of the more extensive distribution of agricultural fields, residential areas and animal farms in the SHR drainage basin. The nitrogen isotopic composition of dissolved nitrate indicates that nitrate-nitrogen (NO3−-N) is derived mainly from atmospheric deposition and/or soil organic matter in the NHR but comes principally from manure or sewage, with only a minor contribution from atmospheric deposition or soil organic matter, in the SHR. The oxygen isotopic compositions of dissolved nitrate suggest that most atmospheric nitrate undergoes microbial nitrification before entering the river.

This article was published in Science of The Total Environment and referenced in Journal of Pollution Effects & Control

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