沂水县浅层地下水水化学特征及人体健康风险评估  

Hydrochemical characteristics and human health risk assessment of shallow groundwater in Yishui County

作　　者：李立伟 许庆 陈秀增 李宜蓉 LI Liwei;XU Qing;CHEN Xiuzeng;LI Yirong(Yishui County Environmental Monitoring Center,Linyi 276400;Yishui County Transportation Bureau,Linyi 276400)

机构地区：[1]临沂市沂水县环境监控中心,临沂276400 [2]沂水县交通运输局,临沂276400

出　　处：《环境科学学报》2024年第3期177-188,共12页Acta Scientiae Circumstantiae

基　　金：重庆交通大学-重庆港力环保股份有限公司资源与环境研究生联合培养基地(No.JDLHPYJD2022005)。

摘　　要：地下水是山东省沂水县及其周边地区饮用水和灌溉用水的主要来源.厘清地下水化学特征及其水质状况,对防止其恶化和区域性开发利用与保护具有十分重要的意义.本研究基于沂水县全域447个地下水样本的层次聚类分析,采用Piper三线图和Gibbs图等图形方法揭示了研究区域地下水化学特征及其演变机制,并通过熵权水质指数(EWQI)对地下水水质进行了评估.结果表明,各聚类模块中地下水整体水质优良,符合国家饮用水水质标准.Na^(+)、SO_(4)^(2-)、Cl^(-)、NH_(4)^(+)-N、NO_(3)^(-)-N和F-的变异系数较大,且NH_(4)^(+)-N、SO_(4)^(2-)、F-以及Cl^(-)对地下水水质的贡献较大,约占55%.地下水水化学类型以HCO_(3)-Mg·Ca为主,影响地下水化学演变的主导因素为岩石风化和溶解.成人的健康风险结果显示,仅Cluster C和Cluster B中存在非致癌风险超过1.0(HI>1)的可接受限值的地下水样本,且其比例均低于20%(分别为18.84%和6.52%),而儿童的这一比例在Cluster C和Cluster B中也较高,且所有聚类模块中均存在HI>1的样本.地下水的非致癌风险在Cluster C和Cluster B中较高,且口服摄入是影响研究区成人和儿童健康风险的最重要途径.地下水水质评价和健康风险评估为区域地下水的可持续发展和污染防治提供了理论参考.Groundwater is the main source of drinking water and irrigation water in Yishui County and its surrounding areas in Shandong Province.Clarifying the hydrochemical characteristics and water quality status of groundwater is of great significance for preventing its deterioration and regional exploitation,utilization and protection.Based on hierarchical cluster analysis of 447 groundwater samples in Yishui County,this study revealed the hydrochemical characteristics and evolution mechanisms of groundwater in the study area by graphical methods such as Piper tri-linear diagrams and Gibbs diagrams,and assessed the groundwater quality through entropy weighted water quality index(EWQI).The results showed that the overall groundwater quality in each cluster module was excellent,meeting the national drinking water quality standards.The coefficients of variation of Na^(+),SO_(4)^(2-),Cl^(-),NH_(4)^(+)-N,NO_(3)^(-)-N and F-were relatively large,and NH_(4)^(+)-N,SO_(4)^(2-),F-and Cl^(-)contributed the most to groundwater quality,accounting for about 55%.The hydrochemical type of groundwater was dominated by HCO_(3)-Mg·Ca,and the dominant factors affecting hydrochemical evolution were rock weathering and dissolution.The results of human health risk assessment showed that only in Cluster C and Cluster B,there were groundwater samples with non-carcinogenic risks exceeding the acceptable limit value of 1.0(HI>1),and the proportions were less than 20%(18.84%and 6.52%respectively),while the proportions were higher for children in Cluster C and Cluster B,and there were samples with HI>1 in all cluster modules.The non-carcinogenic risks of groundwater were higher in Cluster C and Cluster B,and oral intake was the most important pathway affecting human and children's health risks in the study area.The groundwater quality assessment and health risk assessment provided theoretical references for the sustainable development and pollution control of regional groundwater.

关 键 词：地下水 水化学特征 形成机制 健康风险评估 沂水县 

分 类 号：X524[环境科学与工程—环境工程]