湖泊科学2024，Vol.36Issue(4)：1144-1151,中插19-中插20,10.DOI:10.18307/2024.0427
四川盆地农业区河流型水库流域地下水硝酸盐来源解析及健康风险研究
Origin and health risks of nitrate in groundwater from a riverine reservoir basin in an agri-cultural region of Sichuan Basin
摘要
Abstract
Excess nitrate(NO3-)pollution in groundwater is a global environmental concern,particularly in agricultural areas.Ex-cess NO3-in groundwater can potentially contaminate surface water bodies,thereby serving as a significant source of NO3-contami-nation.Therefore,quantifying the sources and their contribution of NO3-in groundwater is needed for designing NO3-control strate-gies.This study selected the groundwater surrounding a riverine reservoir located in an agricultural region of the Sichuan Basin as the study area.Hydrogeochemistry,stable isotopes(δD-H2O and δ18O-H2O,δ15N-NO3-and δ18O-NO3-),the Bayesian isotope mixing model(SIAR),and the human health risk assessment(HHRA)were employed to analyze the sources of NO3-and their contribution,and to evaluate their potential risks to human health.Our investigation results showed that 61％and 40％of groundw-ater samples exceeded the drinking water guideline(10 mg/L)of NO3--N concentration,with a range of 1.24 to 42.91 mg/L and 0 to 42.96 mg/L during the high and low water-level periods,respectively.The isotopic compositions of δ15N-NO3-and δ18O-NO3-in-dicated that manure/domestic wastewater were identified as the primary sources of NO3-in the study area.Nitrification was found to be a critical nitrogen cycling process in the groundwater,and may potentially exacerbated NO3-pollution.The SIAR model results revealed that manure/domestic wastewater contributed approximately 50％and 38％of total NO3-concentration in the groundwater during the high and low water-level periods,respectively.Based on HHRA investigation,consumption of groundwater containing high concentrations of NO3-may pose potential health risks to human beings.关键词
四川盆地/河流型水库/地下水/硝酸盐/氮氧同位素/贝叶斯同位素混合模型(SIAR)/健康风险评估Key words
Sichuan Basin/riverine reservoir/groundwater/nitrate/δ15N-NO3-and δ18O-NO3-/Bayesian isotope mixing model(SIAR)/health risk assessment引用本文复制引用
何可馨,徐芬,周亚倩,覃杰,邬丽姗,何小霞,汪宏,杨睿..四川盆地农业区河流型水库流域地下水硝酸盐来源解析及健康风险研究[J].湖泊科学,2024,36(4):1144-1151,中插19-中插20,10.基金项目
国家自然科学基金项目(41977169,41502233)、四川省重点研发项目(2019YFS0055)和四川省自然科学基金项目(2022NSFC1139)联合资助. （41977169,41502233）
