污灌区地下水硝酸盐污染来源的氮同位素示踪

张翠云; 张胜; 马琳娜; 殷密英

doi:10.3799/dqkx.2012.041

Volume 37 Issue 2

Mar. 2012

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Article Navigation > Earth Science > 2012 > 37(2): 350-356

ZHANG Cui-yun, ZHANG Sheng, MA Lin-na, YIN Mi-ying, 2012. Nitrogen Isotope Tracing of Sources of Nitrate Contamination in Groundwater from Wastewater Irrigated Area. Earth Science, 37(2): 350-356. doi: 10.3799/dqkx.2012.041

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ZHANG Cui-yun, ZHANG Sheng, MA Lin-na, YIN Mi-ying, 2012. Nitrogen Isotope Tracing of Sources of Nitrate Contamination in Groundwater from Wastewater Irrigated Area. Earth Science, 37(2): 350-356. doi: 10.3799/dqkx.2012.041

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Nitrogen Isotope Tracing of Sources of Nitrate Contamination in Groundwater from Wastewater Irrigated Area

doi: 10.3799/dqkx.2012.041

Institute of Hydrogeology & Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China

Received Date: 2011-09-12
Publish Date: 2012-03-15

Abstract

Abstract

In order to identify sources of nitrate in groundwater from the wastewater irrigated area, the southern part of Shijiazhuang City, 5 soil/wastewater samples from potential contamination sources and 19 groundwater samples were collected for chemical and nitrogen isotopic analyses. Irrigation wastewater has relatively low δ¹⁵N value of 4.0‰, and soil applied with commercial fertilizer and beneath animal waste piles has δ¹⁵N values of 1.4‰ and 12.4‰, respectively. The distribution of δ¹⁵N values of sediment from about 30 m-thick vadose zone beneath the vegetable growth plot only applied with animal wastes shows that NO₃^- derived from animal wastes has transported to the lower vadose zone with the mean δ¹⁵N value of 10.9‰. Sediment samples collected from the thick vadose zone beneath the farmland only irrigated with wastewater indicates that the deep vadose zone below the soil layer has narrow range of δ¹⁵N values with the mean δ¹⁵N value of 5.7‰. Groundwater from the wastewater irrigated area has NO₃^- concentration ranging from 52.6 mg/L to 124.5 mg/L with a mean value of 79.72 mg/L, and δ¹⁵N values of NO₃^- ranging from 5.3 to 8.3‰ with a mean value of 7.0‰ except a sample from a deep well. δ¹⁵N values of groundwater from the wastewater irrigated area are higher than those from the deep vadose zone beneath the wastewater irrigated area, which indicates that other sources with higher δ¹⁵N values contribute to groundwater NO₃^-. The other sources are mainly human and animal wastes. NO₃^- in groundwater from the wastewater irrigated area are derived from irrigation wastewater accounting for about 76% and from human and animal wastes accounting for about 24%, respectively. Wastewater irrigation and human/animal wastes management should be strengthened to prevent groundwater NO₃^- contamination in the wastewater irrigated area.
- nitrogen isotopes,
- nitrate contamination,
- groundwater,
- wastewater irrigation area,
- the thick vadose zone,
- hydrogeology,
- environmental geochemistry

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References(27)

References

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Nitrogen Isotope Tracing of Sources of Nitrate Contamination in Groundwater from Wastewater Irrigated Area

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