Research on Soil Effective Heavy Metal Pollution and Health Risks in Guangzhou

ZOU Zihang; CHEN Lian; ZHANG Peizhen; WANG Yuhan; WANG Zhenjiang; LIN Sen; TANG Cuiming; LUO Guoqing; ZHONG Jianwu; LI Zhiyi; WANG Yuan

doi:10.19672/j.cnki.1003-6504.2397.23.338

Abstract：To accurately describe the characteristics,environmental effects,and potential risk levels of soil heavy metal pollution in Guangzhou,210 sampling points were selected to collect soil samples.Single factor index method,Nemero comprehensive index method,potential ecological risk assessment method,health risk receptor model,and Monte Carlo method were used to study the concentration characteristics,ecological risk,and health risk of soil heavy metal available states,and combine the results of ecological risk assessment and health risk assessment to conduct collaborative risk assess-ment for each point.The results showed that the average effective concentrations of Pb,Ni,Cu,Cr,Zn,Cd,and As in the soil of Guangdong Province were 13.66,3.64,17.92,1.74,51.77,0.22,and 0.38 mg/kg,respectively.Cd had exceeded the background value of the soil in Guangdong Province,and the pollution situation was relatively severe.All heavy metals showed strong variability;Except for Cd,which is slightly polluted,all other heavy metals are relatively clean,and the overall pollution level is mild pollution;The potential ecological hazards caused by Cr and As on soil can be ignored,while Cu,Ni,Pb,and Zn present varying degrees of ecological hazards in some sample sites.Cd is the main ecological risk factor for heavy metals in soil in Guangzhou;Oral intake is the main way in which heavy metals pose health risks to children and adults.Children are at greater risk than adults,and each heavy metal does not pose significant health risks to children and adults.The main non carcinogenic factors are Cu and Pb,while the main carcinogenic factors are Cd and As;79％of the sample points in Guangzhou have low potential risks,20％have potential risks,and only one sample point has serious risks.