摘要
为了识别平阴县岩溶地下水中硝酸盐来源,以平阴县岩溶地下水为研究对象,综合利用水化学分析法和氮氧同位素示踪法判别了区内岩溶地下水中NO_(3)^(-)分布规律及来源。结果表明:研究区岩溶地下水为中性至弱碱性,Ca^(2+)为主要阳离子、HCO_(3)^(-)为主要阴离子,岩溶地下水水化学类型以HCO_(3)^(-)Ca型为主,其次为HCO_(3)·SO_(4)^(-)Ca型。岩溶地下水中硝酸盐平均浓度为64.22 mg/L,14个样品中硝酸盐含量超过III类地下水硝酸盐限量值,超标率56%;不同土地利用类型岩溶地下水中硝酸盐含量变化规律为城镇建设用地>旱地>林地。粪便和生活污水是研究区岩溶地下水中硝酸盐的主要来源,其次为农业活动中施用的化肥。建议以岩溶地下水为水源的高风险地区建立除硝酸盐系统,以确保饮用水安全。
In order to identify the sources of nitrate in karst groundwater in Pingyin and evaluate the health risks it poses,the karst groundwater in Pingyin was taken as the research object.The distribution and sources of NO_(3)^(-)in karst groundwater in the area were identified using hydrochemical analysis and nitrogen oxygen isotope tracing methods,and the non-carcinogenic health risk of nitrate in groundwater to humans were evaluated.The results indicate that the karst groundwater in the study area is neutral to weakly alkaline,with Ca^(2+)as the main cation and HCO_(3)^(-)as the main anion.The hydrochemical type of karst groundwater is mainly HCO_(3)-Ca,followed by HCO_(3)·SO_(4)^(-)Ca.The average concentration of nitrate in karst groundwater is 64.22 mg/L,and of 14 samples exceeds the limit of nitrate in Class III groundwater,with a exceedance rate of 56%.The variation pattern of nitrate concentration in karst groundwater of different land use types is urban construction land>dry land>forest land.Feces and domestic sewage are the main sources of nitrate in karst groundwater in the study area,followed by fertilizers used in agricultural activities.According to the human health risk assessment,the main way for daily intake of nitrate in the human body is through drinking water.Areas with excessive nitrate in karst groundwater can have an impact on the health of both adults and children,and the harm to children is much greater than that to adults.It is recommended to establish a nitrate removal system in high-risk areas using karst groundwater as the water source to ensure the safety of drinking water.
作者
段乃金
侯海巅
李波
王焕志
杨晨
宋卫卫
DUAN Naijin;HOU Haidian;LI Bo;WANG Huanzhi;YANG Chen;SONG Weiwei(Shandong Geological Prospecting Institute of China Chemical Geology and Mine Bureau,Ji’nan,Shandong 250013;Pingyin County Natural Resources Bureau,Ji’nan,Shandong 250400;Zhangqiu District Natural Resources Bureau,Ji’nan,Shandong 250200)
出处
《中国煤炭地质》
2025年第3期76-82,63,共8页
Coal Geology of China
基金
山东大学典型岩溶区碳封存潜力调查财政项目(SDGP370100000202302000602)。
关键词
岩溶地下水
硝酸盐
氮氧同位素
来源识别
karst groundwater
nitrate
nitrogen and oxygen isotope
source identification
