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

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	Tracing the sources of nitrate in karstic groundwater in Zunyi, Southwest China: a combined nitrogen isotope and water chemistry approach
	Cong-Qiang Liu; Zhi-Qi Zhao; Zhi-Hua Zhou; Si-Liang Li; Yun-Chao Lang
刊名	Environmental Earth Sciences
	2010
卷号	60 期号:7 页码:1415-1423
英文摘要	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.
学科主题	环境地球化学
语种	英语
公开日期	2017-12-19
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6808]
专题	地球化学研究所_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	Cong-Qiang Liu,Zhi-Qi Zhao,Zhi-Hua Zhou,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	Cong-Qiang Liu,Zhi-Qi Zhao,Zhi-Hua Zhou,Si-Liang Li,&Yun-Chao Lang.(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	Cong-Qiang Liu,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.