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Isotope analysis of nitrate pollution sources in groundwater of Dong'e geohydrological unit

Yang LI1,2, Feng-Xin KANG3,4( ), An-de ZOU1
Shandong Geophysical and Geochemical Exploration Institute, 56 Lishan Road, Jinan 250013, China
Shandong Soil Geochemical Engineering Laboratory, 56 Lishan Road, Jinan 250013, China
Shandong Provincial Bureau of Geology and Mineral Resources, 74 Lishan Road, Jinan 250013, China
Shandong Provincial Research Center of Geological Survey Technology, 74 Lishan Road, Jinan 250013, China
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Abstract

As nitrate pollution in groundwater has become increasingly serious in recent years, nitrogen isotope was adopted in this paper to define its sources in a typical agricultural area of Dong'e hydrogeological unit. The results show that: Higher content of NO3- detected in shallow groundwater is 27.77 mg/L on average and δ15N content ranges from 7.8‰ to 12 ‰, indicating that shallow groundwater is mainly contaminated by sewage or feces. In contrast, less NO3- in deep groundwater (karst water) has an average value of 12.81 mg/L and δ15N content is between 7.2‰ and 14.3‰, which is closely related to human disturbance as mentioned above. In addition, considering relatively low groundwater quality at some monitoring sites, reasonable fertilization is a better choice in the study area to reduce nitrate source in groundwater.

Keywords

GroundwaterNitrogen isotopeNitrogen pollution sourceAgricultural area

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Journal of Groundwater Science and Engineering
Volume 7 Issue 2,
June 2019
Pages 145-154
DOI: 10.19637/j.cnki.2305-7068.2019.02.005
Cite this article:
LI Y, KANG F-X, ZOU A-d. Isotope analysis of nitrate pollution sources in groundwater of Dong'e geohydrological unit. Journal of Groundwater Science and Engineering, 2019, 7(2): 145-154. https://doi.org/10.19637/j.cnki.2305-7068.2019.02.005

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Received: 15 October 2018
Accepted: 25 December 2018
Published: 28 June 2019
© 2019 Journal of Groundwater Science and Engineering Editorial Office
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