摘要
【研究目的】淮河流域是中国典型的高F^(-)地下水分布地区,为全面了解淮河流域平原区含F^(-)地下水的暴露风险,本研究利用近期高密度的地下水测试数据,对地下水调查井F^(-)暴露风险进行分级评价,并对未监测点的F^(-)超标概率进行预测。【研究方法】本研究运用F^(-)风险等级划分与指示克里格方法,评估淮河流域平原区地下水F^(-)污染的风险程度和风险概率,并探讨了高F^(-)地下水的成因。【研究结果】统计分析研究区5575口水井水化学测试数据,F^(-)浓度范围为0.01~5.45 mg/L,中值1.02 mg/L,均值1.97 mg/L。平原地区的F^(-)浓度明显高于丘陵地区;呈现极高风险、高风险水井分别为548口(9.83%)、576口(10.33%),主要分布在内陆平原地带。与深层地下水样品相比,浅层地下水样显示出较高的污染水平和空间变异性。根据F^(-)浓度概率图预测统计,浅层地下水具有高风险面积超过5137 km^(2),而相应深层地下水的高风险面积为864 km^(2),预计有314万人可能遭受饮用含F^(-)地下水的高暴露风险。浅、深层地下水F^(-)超标概率图分布呈现相似的空间分布格局,在内陆平原地带都有明显的浓集中心。【结论】饮用高F^(-)地下水是当地居民遭受其暴露风险的主要途径。地下水高风险地区与氟中毒高发病率在空间上高度重合,揭示地下水F^(-)污染程度与氟中毒病集群相关。高F^(-)地下水系原生成因,萤石矿物的溶解是地下水中F^(-)的主要物质来源,碱性解析、蒸发浓缩作用也影响高F^(-)地下水的形成。本文对淮河流域平原区地下水F^(-)污染暴露风险区进行了划分,研究结果可为区域地下水合理利用与治理提供科学依据。
[Objective]Presently,Huaihe River Basin is identified as a region with F^(-)rich groundwater in China.In order to comprehensively evaluate groundwater F^(-)exposure risk in this basin,this study is to assess its risk magnitude of investigating wells and to predict its risk probability at unsampled points based on the recently obtained high−density hydrochemical data.[Methods]With methods of risk magnitude and indicator kriging,this study is to assess the risk magnitude and likelihood for F^(-)rich groundwater in Huaihe River Plain,and discusses how it formed additionally.[Results]F^(-)concentrations from 5575 investigating wells are in range of 0.01−5.45 mg/L,with a median of 1.02 mg/L and a mean of 1.97 mg/L,respectively.F concentrations in plain areas are significantly higher than those in hilly areas.There are 548(9.83%)wells with high risk magnitude,and 576(10.33%)wells with very high risk magnitude,which are predominant positioned in inland plain.Compared with deep groundwater,shallow groundwater exhibits higher F^(-)levels and spatial variability.Based on the prediction of shallow and deep risk probability maps,the potential high F^(-)hazard areas over shallow groundwater encompass more than 5137 km^(2),while the counterpart over deep groundwater is 864 km^(2);where 3.14 million people are estimated to be potentially exposed to F^(-)contamination.The risk probability map of shallow groundwater shows a similar spatial pattern with that of deep groundwater,and both risk probability peaks are located in inland plain areas.[Conclusions]It is the main route for inhabitants exposed to F^(-)through drinking groundwater.The spatial coincidence of high F^(-)risk probability and high incidence rate of fluorosis observed in inland plain,which might suggest that groundwater F−level is related to the fluorosis cluster.F^(-)rich groundwater is of in−situ origin,and F^(-)is manly derived and released on fluorite dissolution.Besides,alkaline desorption and evaporation concentration affect the formation of high F^(-)groundwater.This paper carried out research on exposure risk of F^(-)rich groundwater in Huaihe River Plain,China,which results may provide scientific basis for the rational utilization and management of regional groundwater.
作者
许乃政
刘林
王赫生
李亮
龚建师
陶小虎
檀梦皎
XU Naizheng;LIU Lin;WANG Hesheng;LI Liang;GONG Jianshi;TAO Xiaohu;TAN Mengjiao(Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Key Laboratory of Watershed Eco-Geological Processes,Ministry of Natural Resources,Nanjing 210016,Jiangsu,China;Chinese Academy of Geological Sciences,Beijing 10037,China;China Science and Technology University,Hefei 230026,Anhui,China)
出处
《中国地质》
北大核心
2025年第6期2148-2157,共10页
Geology in China
基金
中国地质调查局项目(DD20230428、DD20221756)资助。
关键词
高氟地下水
健康风险
指示克里格
风险等级
水文地质调查工程
fluoride−rich groundwater
exposure risk
indicator kriging
risk magnitude
hydrogeological survey engineering
