【摘要】 通过对南四湖表层底泥中的重金属元素浓度分析,揭示出南四湖不同湖区重金属污染物空间分布特征.利用潜在生态风险指数(RI)和地质积累指数(Igeo)两种指标相结合的方法对表层底泥中重金属污染程度进行评价.结果表明,南四湖上级湖的重金属污染主要以汞为主,并依据潜在生态风险指数将南四湖上级湖分为三个生态风险功能区: 昭阳湖轻污染区;独山湖中等污染区和南阳湖重污染区.更多还原

【Abstract】 Heavy metal concentrations (As, Co, Cr, Cu, Hg, Mn, Ni, Pb, Zn) of superficial sediments in the Nansihu Lake were investigated in April, 2002. The determination of the heavy metal distribution of the lakes superficial sediments was carried out by ICP-AES. The potential ecological risk index (RI) and geological acumination index(Igeo), as the quantitative diagnostic tools, were used to evaluate the pollution degree of various heavy metals in the sediments. The results show the distribution of pollutants in the sediments could be divided into three sections with different ecological risk characteristics: ⑴ light pollution area in Zhaoyang Lake, ⑵ medium pollution area in Dushan Lake, and ⑶ heavy pollution area in Nanyang Lake.更多还原