Distribution Characteristics And Health Risk Assessment Of Heavy Metals In The Soil Of Ebinur Lake Basin

Soil is an important environmental element and an indispensable important component of human survival.However,due to the rapid progress of urbanization and industrialization in recent years,many pollutants containing heavy metals had settled or been discharged into the soil,and eventually enter the human body through the food chain.It has caused harm to human body,which has gradually attracted widespread attention from scholars at home and abroad.In order to accurately grasp the status of soil heavy metal pollution in the Aibi Lake Basin and provide a basis for prevention and control,this article takes the soil heavy metals in the Aibi Lake Basin as the research object.First,The method of combining geo-statistics and mathematical statistics is used to initially grasp the characteristics of heavy metal content,and then the geoaccumulation index,potential ecological risk index method,and entropy weight attribute identification model are used to evaluate the pollution characteristics of heavy metals,which is ultimately beneficial to the health risk model for the region Several heavy metals were evaluated for health risks and the source factor analysis was performed using the enrichment factor method.Hazen probability curves were used to provide early warning of risks.The specific results are as follows:Soil accumulation of heavy metals in the Aibi Lake Basin showed different degrees of accumulation.Mathematical statistics analysis shows that only As and Ni The maximum content of each element is higher than the screening value of soil environmental quality;the accumulation of soil As and Hg is more serious,and their average values are 2.17 times and 3.21 times the background values,respectively.Ni has the largest coefficient of variation,and the rest are moderate.The results of spatial analysis show that Mn,Ni,Cu,Cr,Co,Zn,and several elements have high-value regions in the northwest of Lake Aibi,and the correlation analysis results show that Cr is positively correlated with Co and Mn,Cu,and Co The coefficient is high,and the distribution of high-value zones is basically the same as that of the industrial parks in the study area.The results of the entropy weight attribute recognition model show that although there are differences between regions,the overall situation of the accumulated pollution of heavy metals in the soil in the study area;the pollution scores in the five sub-regions are as follows:region 5>region 3>region 2>Area 1>Area 4 but the overall rating is 1.Geoaccumulation index analysis results show that:all elements in the study area have different levels of pollution,and the accumulation of Hg is the highest.The number of samples with pollution level 2 and above accounted for 54.7%;potential ecological risks are compared with background values.It is concluded that the average value of a single potential ecological risk index of only Hg among all elements in the study area is greater than the limit of 80,which is at the level of level 3 ecological hazard,and the rest are level 1 ecological hazards,and the comprehensive potential ecological risk value of 61.33%of the sample points is 2～3 degree of harm.The average value of the potential ecological risk index of the eight elements in the reference study area was less than 40,and all the samples in the study area belonged to the level 1（minor）ecological hazard.The comprehensive potential ecological risks of the eight elements in the study area belong to the level 1（minor）hazard.The results of the health risk assessment showed that soil As,Cr,Cd,and Pb were the four major contributors to the non-carcinogenic risk in this study area,and As and Cd were also the main carcinogenic risk factors in the area.The individual carcinogenic health risk index of Cr,As,Cd,and three elements on adults and children is greater than the standard value of soil governance recommended by USEPA(10^-6),and the total carcinogenic risk index of three elements on adults and children exceeds that of governance.Standard;As has a higher carcinogenic risk.Its individual carcinogenic risk index values for adults and children are 93.9 and 88.8 times the upper limit of treatment,respectively.The overall carcinogenic risk of three elements to adults is higher than that of children.The cumulative contribution rate of both is over 99%.The enrichment factor results showed that the enrichment factors of As,Ni,and Se elements varied greatly,and As elements were slightly enriched to moderately enriched;most of the samples of Co,Zn,and Ni elements.All of them are in the state of no enrichment,and it can be determined from the enrichment factors that the five elements As,Cr,Hg,Zn,and Se are mainly natural sources,while the remaining elements are mixed sources of natural and man-made.