Source Analysis and Health Risk Assessment of Metal Elements in Karst Groundwater of Qingjiang River Basin
Karst groundwater is an important water resource for the production and lives of native residents in the Qingjiang River Basin,and even the only water source for some karst areas.It is necessary to determine the pollution sources and poten-tial health risks of metal elements in karst groundwater.In this study,10 metal elements(i.e.,Al,Cu,Pb,Zn,Cr,Ni,Co,Cd,Mn and As)in 46 groups of karst groundwater samples were analyzed.Multivariate statistical analysis and positive matrix factorization model(PMF)were used to analyze the distribution characteristics,potential sources and contribution share of metal elements in karst groundwater in the Basin.The health risk assessment model was used to evaluate the potential health risks of metal elements exposed to adults and children through different intake pathways.The results showed that the qualitative analysis was consistent with the quantitative analysis of PMF.The qualitative results showed that Co,Cu,Pb,Mn and Al were mainly affected by primary geological processes,Ni and Cd were mainly affected by industrial activities,and As was mainly affected by agricultural activities.The quantitative results of the PMF model show that there are five main influ-encing factors in the study area.Factor 1 is mining activity,with an average contribution rate of 14.4％.Factor 2 is light indus-trial production activity,with an average contribution rate of 26.3％.Factor 3 is agricultural activity,with an average contri-bution rate of 19.3％.Factor 4 is road traffic action,with an average contribution rate of 17.8％.Factor 5 is primary geologi-cal action,with an average contribution rate of 22.2％.The total health risks exposed for residents through drinking pathway were higher than these through skin infiltration.The health risks of adults exposed through drinking pathway were lower than that of children,but the health risks of adults exposed through skin infiltration were higher than that of children.The main met-al element causing carcinogenic health risk was identified as Cr,which should be paid more attention in the development and utilization of karst groundwater resources in the Basin.
karst watermetal elementsmultivariate statisticsPMF modelhealth riskQingjiang River Basin
万方数据
维普
