Occurrence and Risk Assessment of Heavy Metals in Sanmenxia Reservoir
Based on the analysis of water and sediment samples collected from Sanmenxia Reservoir, the occurrence of heavy metals(Cr, Mn,Ni,Cu,As,Cd,Pb,and Hg)was investigated,and the health risk and ecological risk induced by heavy metals were evaluated by u-sing the health risk assessment method,the cumulative index method and the potential risk assessment index method,respectively.The results show that the contents of heavy metals in the water meet the second level of national water environment quality standard. The annual average health risk of chemical carcinogen As is 1.43×10-5-1.41×10-4,with the maximum value exceeding the ICRP recommended value,posing a potential threat to human health.The risks induced by other heavy metals are below the recommended values and would not constitute a health risk. The contents of Cr,Cu,Pb,and Hg in the sediments meet the secondary level of national soil environmental quality secondary standard (the limit value for maintaining human health),while Ni,As,and Cd concentrations meet the three third level standards of national soil en-vironmental quality standard(soil critical values for the protection of agricultural and forestry production and plant growth).The results of cu-mulative index assessment show that Hg and Cd in the sediments are moderately polluted,while other elements are slightly polluted or non-polluted. The total potential risk index of heavy metals is 250.00-355.11,indicating a strong pollution level,with Hg and Cd being the main contributing factors.
国家科技期刊平台
NSTL
万方数据
维普
