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《Environmental Science》 2010-10
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Using Nitrate Isotope to Trace the Nitrogen Pollution in Chanhe and Laohe River

XING Meng1,2,LIU Wei-guo1,3,HU Jing1,2(1.State Key Laboratory of Loess and Quaternary,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3.School of Human Settlement and Civil Engineering,Xi'an 710049,China)  
Nitrogen isotope tracing method was used to identify the dominate contamination source of Chanhe River and Laohe River.The results showed that the δ15 N-NO 3-values of Chanhe and Laohe River from upper to lower stream were 1.3‰ to 9.0‰ and 3.3‰ to 7.4‰,respectively.And the δ15 N values of the sewage samples were 11.5‰ and 11.1‰.Through comparing the upper and lower stream δ15 N value with the sewage sample,this research found that nitrate isotope indicated the contamination sources,and the nitrate isotope value could provide more valuable messages relative to the nitrate concentration.Meanwhile,this research approximately divided the main nitrogen source in different river drainage areas.These results can offer important information for investigating the nitrate pollution and nutrient runoff in this area.
【Fund】: 中国科学院知识创新工程项目(KZCX2-YW-149);; 国家自然科学基金项目(40673012 40599422);; 黄土与第四纪国家重点实验室开放基金项目(SKLLQG0921);; 国家水体污染控制与治理科技重大专项(2009ZX07101-013)
【CateGory Index】: X52
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