The source identification of nitrate in groundwater in Guanzhong section of Weihe river basin

ZHANG Wen-rui; ZHANG Yan; SHI Wen-min; ZHANG Cheng-qian

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China Environmental Science ›› 2022, Vol. 42 ›› Issue (10) : 4758-4767.

Environmental Ecology

The source identification of nitrate in groundwater in Guanzhong section of Weihe river basin

ZHANG Wen-rui, ZHANG Yan, SHI Wen-min, ZHANG Cheng-qian

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Abstract

In order to identify the source of nitrogen pollution in groundwater and the characteristics of its migration and transformation qualitatively and quantitatively, the nitrogen and oxygen stable isotope technology and the SIAR model on the basis of hydrochemical analysis were combined in this paper to judge the source of groundwater recharge and the characteristics of groundwater nitrogen pollution in Guanzhong section of Weihe River Basin. The results showed that the main hydrochemical type of groundwater in the Guanzhong section of the Weihe River Basin was HCO₃-Ca+Mg, and the groundwater was mainly recharged by rapid infiltration of precipitation and infiltration of surface water. Groundwater nitrogen pollution was mainly in the form of nitrate nitrogen. In all 34 groundwater samples collected, the variation range of nitrate nitrogen content was 0.154~36.717 mg/L, with an average content of 6.17 mg/L. The nitrate nitrogen content in two sampling points exceeded the Grade III groundwater standard, and the exceeding rate was 5.9%. The dominant role of nitrogen cycle was nitrification. The variation range of δ¹⁵N-NO₃^- content in groundwater was +6.08‰~+16.42‰ while δ¹⁵O-NO₃^- was +9.38‰~+12.514‰. Nitrate nitrogen pollution was mainly affected by human activities, soil organic nitrogen, manure and sewage and atmospheric deposition were the main contributors to groundwater nitrate nitrogen, with an average contribution rate of 44.65%, 40.03% and 15.32%, respectively.

Key words

groundwater in Weihe River Basin / hydrochemical analysis / hydrogen and oxygen isotope / nitrate pollution / nitrogen and oxygen isotopes / SIAR

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ZHANG Wen-rui, ZHANG Yan, SHI Wen-min, ZHANG Cheng-qian. The source identification of nitrate in groundwater in Guanzhong section of Weihe river basin[J]. China Environmental Science. 2022, 42(10): 4758-4767

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