Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 395, Issue 2-3, Pages 117-124Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2008.01.058
Keywords
Han River; source of nitrate; nitrogen and oxygen isotopes; microbial nitrification
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Funding
- Korea Agency for Infrastructure Technology Advancement (KAIA) [09-2007-09-001-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Education, Science & Technology (MoST), Republic of Korea [N28099] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [핵06A2102] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (c) 2008 Elsevier B.V. All rights reserved.
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