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Nitrogen Isotope Study on Nitrate-Contaminated Groundwater in the Sichuan Basin, China

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Abstract

We investigated the expansion of NO3 −-contaminated groundwater in the Sichuan Basin, China. Nitrogen concentrations and isotopic ratios of NH4 + and NO3 − were analyzed in groundwater and rain collected from four areas in this basin in order to evaluate the sources of nitrogen pollution. NH4 + in rain, for which δ15N values are strongly negative to slightly positive −13.4 to + 2.3‰, appears to originate from fertilizers and excretory waste. NO3 − in rain (δ15N: −10.2 to −4.4‰) was attributed to NO x from automobile exhaust gas. In the studied area, well water sampled from farmyards was found to have the highest δ15NNO3 (average: +9.7 ± 4.7‰), indicating contamination by domestic sewage as animal excrement. The lowest δ15NNO3 (−0.2 ± 3.7‰), found in spring water, indicates that the studied groundwater samples are widely affected by air contaminants (mainly as nitrogen oxides) resulted from fuel combustions. The δ15NNO3 (+3.7 ± 2.1‰) values of well water from farmland are between these levels, suggesting that NO3 − contamination results primarily from cultivation using nitrogen fertilizers, although the contribution from animal excrement cannot be excluded. These results demonstrate that the studied groundwater is widely polluted by locally derived nitrogen sources.

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Authors and Affiliations

  1. Department of Geosciences, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan

    Xiaodong Li & Harue Masuda

  2. Department of Environment and Civil Engineering, Chengdu University of Technology, 610059, Chengdu, People’s Republic of China

    Xiaodong Li & Haiao Zeng

  3. Department of Environmental Science and Technology, Tokyo Institute of Technology, 226-8502, Yokohama, Japan

    Keisuke Koba

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  1. Xiaodong Li
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  2. Harue Masuda
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  3. Keisuke Koba
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  4. Haiao Zeng
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Correspondence to Xiaodong Li.

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Li, X., Masuda, H., Koba, K. et al. Nitrogen Isotope Study on Nitrate-Contaminated Groundwater in the Sichuan Basin, China. Water Air Soil Pollut 178, 145–156 (2007). https://doi.org/10.1007/s11270-006-9186-y

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  • DOI: https://doi.org/10.1007/s11270-006-9186-y

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