乐安江沉积物重金属污染及生态风险性评价

Pollution and Ecological Risk Assessment for Heavy Metals in Sediments of Lean River

对１９８７—１９９５年期间所采集的乐安江表层沉积物中的重金属含量进行了统计分析和生态风险性评价．结果表明，德兴铜矿的矿山酸性废水和洎水河河水，使乐安江沉积物受到重金属的严重污染．沽口—香屯河段沉积物主要受到Ｃｕ严重污染，戴村受到Ｚｎ、Ｃｕ、Ｐｂ等重金属的共同污染，虎山—蔡家湾河段沉积物受到中等或轻度重金属污染．沉积物中Ｃｕ与Ｓ、Ｆｅ和水合氢氧化物有极显著的相关性，偏相关分析表明沉积物中Ｓ是控制Ｃｕ含量的主要因素．Ｐｂ主要与Ｍｎ（ｒ＝０．９４２２）和Ｆｅ（ｒ＝０．７２７１）元素呈显著相关性．Ｚｎ与Ｍｎ显示极显著相关性（ｒ＝０．８０８１）．并且，乐安江沉积物具有潜在的生态危害性．

By integrating and comparison of the experiment dada collected during 1987 to 1995 on Lean River,the pollution and ecological risk for heavy metals in sediments were assessed.The results showed that the sediments of Lean River were heavily polluted due to discharge from Dexing copper mine and mines along the Jishui River.There were high contents of copper in sediment in the upstream (A04_A06) due to the pollution from Dexing copper mine and high concentrations of zinc,copper and lead in sediments at site A07,and rather high concentrations of copper and zinc in the downstream (after site A07) due to the pollution from the upstream and Jishui River.The correlation coefficients between Cu against S,Fe or hydroxides were very significant.The analysis of partial correlation coefficients indicated that S was a main receptor for Cu in sediments.The correlation coefficients of Pb Mn( r =0 9422),Pb Fe( r =0 7271) and Zn Mn( r =0 8081)was also very significant.We concluded that the heavy metals in sediments possess potential ecological risk.