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The sources and dispersal of nitrate in multiple waters, constrained by multiple isotopes, in the Wudalianchi region, northeast China

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Abstract

The Wudalianchi scenic area in NE China has been named an UNESCO “Global Geopark” and “Biosphere Reserve.” During this investigation, the sources of nitrate and the hydrologic system through which it is dispersed were assessed using geochemical data and a multiple isotopic approach. The cold waters from the south and north springs originated from the deep subsurface. Isotopically, these waters exhibited relatively negative δD and δ18O values and nitrate in the water was substantially depleted 15N, suggesting that the mineral water was primarily derived from depth. Lakes within the Wudalianchi region were primarily composed of water from these deep mineral springs and precipitation. Chemical fertilizers were the primary source of nitrate to the Wudalianchi lakes. Groundwater was found in shallow mineral springs and wells plotted above the local meteoric water line, implying that shallow groundwater was primarily derived from precipitation. Elevated concentrations of nitrate in shallow mineral springs and well waters during the summer, autumn, and winter suggest that shallow groundwater within the Yaoquan volcanic area was also polluted by nitrate from human activities. Denitrification of shallow groundwater is slow, reducing the potential for “self-remediation”. The concentration data are supported by nitrogen (N) isotope data; wells and springs exhibited N isotopic ratios between − 5‰ and + 5‰ (typical of fertilizers and precipitation) and exhibited higher oxygen (O) isotope values than water in the Wudalianchi lakes. These relationships suggest that nitrate in shallow mineral springs, wells, and lakes near the Yaoquan volcano was derived from the mixing of chemical fertilizers with local summer rainfall.

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Acknowledgements

We gratefully acknowledge Prof. Philippe Garrigues and two anonymous reviewers for their thoughtful and constructive comments.

Funding

This work was supported financially by National Natural Science Foundation of China (Grant No. 41472237), Jilin University Postdoctoral Research Start-up Funds (801171050425), Liaoning Innovation Team Project (No. LT2015017) and Research Programs of Heilongjiang Land and Resources Department.

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Correspondence to Junyu Zou.

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Responsible editor: Philippe Garrigues

Highlights

1. Agricultural non-point source nitrate pollution is a serious problem in the Wudalianchi scenic area, a “Global Geopark” and “Biosphere Reserve.”

2. Geochemical data were combined with multiple stable isotopes to analyze the source and interconnections between lake, spring, and groundwaters.

3. Anthropogenic pollutants, particularly chemical fertilizers, were the primary sources of nitrate to the lakes as well as shallow mineral springs and wells.

4. The chemistry of cold deep mineral spring waters primarily reflected water-rock interactions at depth and, in combination with precipitation, served as the primary source of water to the lakes.

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Zhang, H., Yang, Y., Zou, J. et al. The sources and dispersal of nitrate in multiple waters, constrained by multiple isotopes, in the Wudalianchi region, northeast China. Environ Sci Pollut Res 25, 24348–24361 (2018). https://doi.org/10.1007/s11356-018-2490-4

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  • DOI: https://doi.org/10.1007/s11356-018-2490-4

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