长江入海口北支沿海滩涂养殖区底泥重金属污染特征及趋势评价

对长江入海口北支沿海滩涂养殖区底泥重金属污染的总体水平进行调查,结果表明,滩涂养殖区底泥重金属含量满足海洋沉积物质量一类标准要求,污染程度属于安全Ⅰ级水平,重金属潜在生态危害属轻微级别,6种重金属潜在生态危害由大到小排序依次为Cd﹥Hg﹥Cu﹥Cr﹥Pb﹥As,2005年～2011年,底泥重金属污染程度均处于安全的Ⅰ级水平。

Assessment on Heavy Metal Pollution and its Change in the Sediment of the Aquatic Culture Zone on Coastal Mudflat along the North Branch of Yangtze River Estuary

The pollution level of heavy metals in the sediment of the mudflat was investigated in aquatic culture zone along the north branch of Yangtze River estuary. The resuhs showed that the heavy metal contents met the standard I of Ocean Sediment Quality Standard and the pollution belonged to the level in safe Class I, of which the potential ecological harm reached a level of light pollution. The ecological risk of heavy metals was ranked as Cd 〉 Hg 〉 Cu 〉 Cr 〉 Pb 〉 As. During 2005- 2011 the heavy metal pollution was under a safe level of Class I.