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    Yang Kaili, Liu Shuliang, Wan Huiyun, Yan Kun, Tao Yujun, Wang Hongsong. 2024. Analysis of nitrate sources in surface water in northern Yantai based on nitrogen and oxygen isotopes and MixSIAR model[J]. Geology in China, 51(6): 2066−2076. DOI: 10.12029/gc20240328001
    Citation: Yang Kaili, Liu Shuliang, Wan Huiyun, Yan Kun, Tao Yujun, Wang Hongsong. 2024. Analysis of nitrate sources in surface water in northern Yantai based on nitrogen and oxygen isotopes and MixSIAR model[J]. Geology in China, 51(6): 2066−2076. DOI: 10.12029/gc20240328001

    Analysis of nitrate sources in surface water in northern Yantai based on nitrogen and oxygen isotopes and MixSIAR model

    • This paper is the result of environmental geological survey engineering.
      Objective Nitrate pollution in surface water is a global environmental issue, therefore identifying the source and transformation of nitrate is fundamental to improving water quality.
      Methods To accurately identify the sources and transformation processes of nitrate in surface water in north of Yantai city, hydrochemistry and dual isotopes of nitrate nitrogen−oxygen technologies were used to sample and analyze surface water from different river basins, including Dagujia River, Xin'an River, Qinshui River, and Han River. And the Bayesian isotopes mixing model MixSIAR was also used to calculate the contribution rates of various nitrate sources.
      Results (1) The surface water in the study area is weakly alkaline, with NO3−N concentration significantly higher than NH4+−N and NO2−N concentrations, making NO3−N is the primary nitrogen pollutant in the surface water of the study area. Only the NO3−N concentration in Xin'an River (NO3−N<10 mg/L) fell within the national health standard for drinking water. (2) Nitrification dominates the nitrate transformation process in the surface waters in the study area, while denitrification playing a negligible role. (3) The output results of the MixSIAR model show that the contribution rates of nitrate sources in surface water in the study area are as follows: sewage and manure (51.1%)>soil organic nitrogen (23.9%)>chemical fertilizer (22.9%)>atmospheric deposition (2.1%).
      Conclusions Overall, sewage and manure have the highest contribution rate to nitrate sources in surface water in the study area, followed by soil organic nitrogen and chemical fertilizer. Sewage and manure from anthropogenic inputs are the main sources of nitrate pollution in the study area. Therefore, reducing discharge of sewage and manure into rivers is key to controlling pollution.
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