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Relationship of nitrate isotopic character to population density in the Loess Plateau of Northwest China
Xing, M (Xing, Meng)[ 1 ]; Liu, WG (Liu, Weiguo)[ 1,2 ]; Wang, ZF (Wang, Zhoufeng)[ 3 ]; Hu, J (Hu, Jing)[ 1 ]
2013-08-30
Source PublicationAPPLIED GEOCHEMISTRY
Volume35Pages:110-119
Subtype期刊论文
Abstract

Nitrate pollution of groundwater is an increasingly serious anthropogenic problem. In this study, the hydrogeochemistry of major ions and stable isotope ratios of NO3- in groundwater were determined to identify the contamination sources and chemical transformation processes occurring in the shallow groundwater of Xi'an, the capital of Shaanxi province, NW China. Of a total of 32 groundwater samples, 31% had NO3--N concentrations exceeding the accepted drinking water limit of 10 mg-N L (1). Most of these samples were from the urban center of the study area, while samples with <10 mg-N L (1) were mainly from suburban areas. Combined with information on NO3- and Cl-, the variation in isotopes of NO3- in the groundwater suggest a mixing of multiple NO3- sources in areas on the urban/suburban border. By determining rainwater and river water NO3- isotopic values, the groundwater recharge mode can be deduced for Xi'an city. Chemical fertilizers and nitrification of N-containing organic materials contribute NO3- to suburban groundwater, while sewage effluent and nitrification dominate NO3- distribution in urban groundwater. Nitrification from organic soil N, manure and sewage was significant in some sampling areas, and NO3- isotopic values from groundwater in Xi'an indicated that the effects of denitrification were not an obvious contributor. Thus, the delta N-15-NO3- enrichment process is mainly caused by the intense anthropogenic activity in the city center. From the urban center to suburban areas, the mean delta N-15-NO3- values varied from +16.4 parts per thousand to +5.4 parts per thousand, and the mean NO3--N concentrations varied from 28.0 mg L (1) to 4.0 mg L (1). In particular, the delta N-15-NO3- value (r = -0.75, p < 0.01) correlated more significantly with distance from the urban center than did the NO3--N concentration data (r = -0.49, p < 0.01), which suggests that NO3- isotopic values are an effective indicator of contamination sources. In addition, the delta N-15-NO3- values and population density show a significant logarithmic correlation in Xi'an city.

DOI10.1016/j.apgeochem.2013.04.002
Indexed BySCI ; EI
Language英语
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10025
Collection加速器质谱中心
Corresponding AuthorXing, M (Xing, Meng)[ 1 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
2.Xi’an Jiaotong University, School of Human Settlement and Civil Engineering, Xi’an 710049, China;
3.Chang’an University, School of Environmental Science and Engineering, Xi’an 710064, China
Recommended Citation
GB/T 7714
Xing, M ,Liu, WG ,Wang, ZF ,et al. Relationship of nitrate isotopic character to population density in the Loess Plateau of Northwest China[J]. APPLIED GEOCHEMISTRY,2013,35:110-119.
APA Xing, M ,Liu, WG ,Wang, ZF ,&Hu, J .(2013).Relationship of nitrate isotopic character to population density in the Loess Plateau of Northwest China.APPLIED GEOCHEMISTRY,35,110-119.
MLA Xing, M ,et al."Relationship of nitrate isotopic character to population density in the Loess Plateau of Northwest China".APPLIED GEOCHEMISTRY 35(2013):110-119.
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