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

1Shandong Geophysical and Geochemical Exploration Institute, 56 Lishan Road, Jinan 250013, China.2Shandong Soil Geochemical Engineering Laboratory, 56 Lishan Road, Jinan 250013, China.3Shandong Provincial Bureau of Geology and Mineral Resources, 74 Lishan Road, Jinan 250013, China.4Shandong Provincial Research Center of Geological Survey Technology, 74 Lishan Road, Jinan 250013, China.

摘要

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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.
- Nitrogen isotope /
- Groundwater /
- Nitrogen pollution source /
- Agricultural area

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参考文献(28)

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