Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach

	Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach
	Si-Liang Li; Cong-Qiang Liu; Yun-Chao Lang; Zhi-Qi Zhao; Zhi-Hua Zhou
	2010
发表期刊	Environmental Earth Sciences
卷号	60 期号:7 页码:1415-1423
摘要	Nitrate (NO 3 61 ) is major pollutant in groundwater worldwide. Karst aquifers are particularly vulnerable to nitrate contamination from anthropogenic sources due to the rapid movement of water in their conduit networks. In this study, the isotopic compositions (δ 15 N–NO 3 61 , δ 15 N–NH 4 + ) and chemical compositions(e.g., NO 3 61 , NH 4 + , NO 2 61 , K + ) were measured in groundwater in the Zunyi area of Southwest China during summer and winter to identify the primary sources of contamination and characterize the processes affecting nitrate in the groundwater. It was found that nitrate was the dominant species of nitrogen in most of the water samples. In addition, the δ 15 N–NO 3 61 values of water samples collected in summer were lower than those collected in winter, suggesting that the groundwater received a significant contribution of NO 3 61 from agricultural fertilizer during the summer. Furthermore, the spatial variation in the concentration of nitrate and the δ 15 N–NO 3 61 value indicated that some of the urban groundwater was contaminated with pollution from point sources. In addition, the distribution of δ 15 N–NO 3 61 values and the relationship between ions in the groundwater indicated that synthetic and organic fertilizers (cattle manure) were the two primary sources of nitrate in the study area, except in a few cases where the water had been contaminated by urban anthropogenic inputs. Finally, the temporal and spatial variation of the water chemistry and isotopic data indicated that denitrification has no significant effect on the nitrogen isotopic values in Zunyi groundwater.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6808
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Si-Liang Li,Cong-Qiang Liu,Yun-Chao Lang,et al. Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach[J]. Environmental Earth Sciences,2010,60(7):1415-1423.
APA	Si-Liang Li,Cong-Qiang Liu,Yun-Chao Lang,Zhi-Qi Zhao,&Zhi-Hua Zhou.(2010).Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach.Environmental Earth Sciences,60(7),1415-1423.
MLA	Si-Liang Li,et al."Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach".Environmental Earth Sciences 60.7(2010):1415-1423.

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