Pollution Characteristics and Ecological Risk Assessment of Heavy Metal in Changsha City Based on Total and Available Content of Soil Heavy Metals
In this paper,100 soil samples collected in Changsha city were taken as the research object,and the pol-lution characteristics of Cd,Pb,Cr and Cu were deeply analyzed from the perspective of the total and available content of soil heavy metals,and the ecological risk assessment of four heavy metals was carried out by Hakanson potential ecological risk assessment.Results showed that there were different degrees of accumulation in Cd,Pb,Cr and Cu,especially Cd.The biological availability coefficient of four heavy metals was Cd(67.6%)>Pb(24.2%)>Cu(23.0%)>Cr(0.9%),and Cd had the greatest risk of environmental pollution.The total content of Pb,Cd and Cu is the main factor to control the available heavy metal.The bioavailability coefficients of Cd,Pb,Cr and Cu were mainly affected by the available content of soil heavy metals.From the perspective of total or a-vailable content of soil heavy metals,Cd is the most important potential ecological risk factor in the study area,while the other three heavy metals have low ecological pollution risks.The comprehensive ecological risks of four heavy metals based on the total and available content of soil heavy metals was at a strong level.
total content of soil heavy metalsavailable heavy metalspollution characteristicsecological risk as-sessment
万方数据
维普
