微山湖水域重金属分布特征及水质评价

2010年4月对山东微山湖6种重金属分布特征进行研究,结果表明,Cu、Zn、Pb、Cr、Ni、Cd平均含量分别为0.035 9、0.148 0、0.112 0、0.038 0、0.040 0、0.003 7 mg/L;总体表现为运河区>河口区>养殖区。相关分析表明,6种重金属含量具有较强的相关性。逐步回归分析发现,不同重金属受总悬浮物、有机悬浮物、无机悬浮物的影响程度存在较大差异。对微山湖重金属污染现状进行分析表明,Cu、Pb、Zn、Ni、Cd、Cr平均超标倍数分别为2.59、1.35、0.61、0.07、0.02、0倍;超标率分别为100%、60%、70%、20%、20%、0;微山湖重金属污染达到重度污染水平,Cu、Pb为主要的污染元素。

Distribution characters of heavy metals and water quality evaluation in the Weishan Lake

Distribution characters of heavy metals were studied in the Weishan Lake in Shandong in April 2010.The results showed that the average contents of Cu,Zn,Pb,Cr,Ni,Cd were 0.035 9,0.148 0,0.112 0,0.038 0,0.040 0,0.003 7 mg/L,respectively;Pearson correlation analysis indicated that most heavy metals had significant correlation with each other.Stepwise regression analysis between heavy metals and suspended solids were used,and we found that Cr,Pb were significantly impacted by total suspended solids,Ni and Zn were significantly impacted by organic suspended solids,Cu was significantly impacted by inorganic suspended solids.Multiples beyond standards of Cu,Pb,Zn,Ni,Cd,Cr were 2.59,1.35,0.61,0.07,0.02,0;and their unattainment rates were 100%,60%,70%,20%,20%,0 respectively.By general pollution indices we found that Weishan Lake was seriously polluted;Cu and Pb were the main pollution factors.