獐子岛贝类养殖区表层沉积物重金属分布特征及潜在生态危害评价

The distribution and potential ecological risk of heavy metals in surface sediments from the shellfish culture areas of Zhangzi Island

研究了獐子岛虾夷扇贝养殖区表层沉积物中Pb、Cd、Cu、Zn等有害重金属的含量及时空分布,并采用瑞典学者Hakanson的潜在生态危害指数法对该区域重金属的分布特征和生态风险进行了分析。结果表明,獐子岛海域表层沉积物Pb、Cd、Cu、Zn含量均是在夏季较低、冬季较高,最高含量分别为9.17±2.05、0.06±0.014、6.71±2.01、24.94 mg/kg±5.21 mg/kg,远低于国家一类海域标准及Hakanson提出的全球工业化前沉积物中相应污染物的背景值。综合评价,该海域表层沉积物中重金属的污染程度不具有生态风险性,整个养殖区养殖环境良好,为优良的贝类增养殖海域。

The content and distribution of heavy metals （Pb, Cd, Cu, Zn） in the surface sediment samples collected from the shellfish culture area of Zhangzi Island, were analysed. Their potential ecological risks were assessed with the method presented by Lars Hakanson. The results showed that the contents of Pb, Cd, Cu and Zn were higher in winter and lower in summer, and the highest content is 9.17±2.05, 0.06±0.014, 6.71±2.01 and 24.94±5.21 mg/kg respectively, which is far lower than that in other areas and also the national criterion. Therefore, there was no po- tential economical risk of the heavy metals in this area and the environmental quality of culture was very well.