浅层地下水硝酸盐来源解析及健康风险评价:以渭南市华州区为例  

Identification of Nitrate Sources and Main Controlling Factors in Shallow Groundwater Based on MixSIAR and Random Forest Model

作　　者：李培月 李凌茜[2,3,4] 田艳 何松 寇晓梅 LI Peiyue;LI Lingxi;TIAN Yan;HE Song;KOU Xiaomei(PowerChina Sinohydro Bureau 3 Co.,LTD.,Xi’an 710024,Shaanxi,China;School of Water and Environment,Chang’an University,Xi’an 710054,Shaanxi,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education,Chang’an University,Xi’an 710054,Shaanxi,China;Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of the Ministry of Water Resources,Chang’an University,Xi’an 710054,Shaanxi,China;PowerChina Northwest Engineering Corporation Limited,Xi’an 710065,Shaanxi,China)

机构地区：[1]中国水利水电第三工程局有限公司,陕西西安710024 [2]长安大学水利与环境学院,陕西西安710054 [3]旱区地下水文与生态效应教育部重点实验室(长安大学),陕西西安710054 [4]水利部旱区生态水文与水安全重点实验室(长安大学),陕西西安710054 [5]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《西北地质》2025年第2期80-90,共11页Northwestern Geology

基　　金：国家重点研发计划项目课题“土壤-地下水污染时空演化规律及主控因子”(2023YFC3706901);国家自然科学基金面上项目“大型灌区地下水多场协同作用下典型农业污染物迁移转化机制研究”(42472316)联合资助。

摘　　要：作为全球水资源中最普遍的污染物,NO_(3)^(-)主控因素和来源的识别对NO_(3)^(-)污染控制至关重要。本研究基于人体健康风险、随机森林模型、同位素和MixSIAR模型等方法,分析了华州区浅层地下水NO_(3)^(-)分布特征和潜在风险,揭示了浅层地下水NO_(3)^(-)的重要因素和主要来源。结果表明:华州区浅层地下水NO_(3)^(-)浓度呈西高东低趋势分布,西南部尤为显著,NO_(3)^(-)浓度高达271mg/L。主要控制NO_(3)^(-)浓度的指标依次为:EC>ORP>Ca^(2+)>Mg^(2+)>T>TDS>HCO_(3)^(-)。NO_(3)^(-)来源以土壤氮和粪肥及污水为主,且粪便及污水对NO_(3)^(-)含量贡献率最大(63.8%),其次是土壤氮(19%)和化肥(12.7%)。长期饮用研究区NO_(3)^(-)浓度较高的浅层地下水对人类健康具有潜在风险,特别是儿童,其HHRA评估风险值高达7.904。As the most common pollutant in global water resources,the identification of the main controlling factors and sources of NO_(3)^(-)is crucial to the control of NO_(3)^(-)pollution.Based on methods such as human health risk model,random forest model,isotope and MixSIAR model,this study analyzed the distribution characteris-tics and potential risks of shallow groundwater NO_(3)^(-)in Huazhou District,and revealed the main controlling fac-tors and main sources of shallow groundwater NO_(3)^(-).The results show that the shallow groundwater NO_(3)^(-)con-centration in Huazhou District is high in the west and low in the east,especially in the southwest.The NO_(3)^(-)con-centration is as high as 271 mg/L.The main factors controlling NO_(3)^(-)concentration being EC>ORP>Ca^(2+)>Mg^(2+)>T>TDS>NO_(3)^(-).The main sources of NO_(3)^(-)are soil nitrogen and manure&sewage.The manure&sewage contributes the most to the NO_(3)^(-)content(63.8%),followed by soil nitrogen(19%)and chemical fertiliz-er(12.7%).Long-term drinking of shallow groundwater with high NO_(3)^(-)concentration in the study area has po-tential risks to human health,especially for children,whose HHRA assessment risk is as high as 7.904.

关 键 词：浅层地下水硝酸盐 N-O同位素 贝叶斯混合模型 随机森林模型 健康风险评估 

分 类 号：P641[天文地球—地质矿产勘探]