广西合浦儒艮国家级自然保护区表层沉积物重金属污染及其潜在生态危害评价

Pollution of heavy metals and their assessment of potential ecological risk in surface sediments of National natural reserve of Dugong in Hepu of Guangxi

分析了合浦儒艮自然保护区表层沉积物中重金属(Cu、Pb、Zn、Cd、Hg、As)含量的分布特征,并采用海洋沉积物质量国家标准和Hakanson沉积物重金属潜在生态危害系数与危害指数方法评价了该保护区沉积物重金属污染程度和潜在生态危害。结果表明:该保护区表层沉积物重金属含量均达到第一类海洋沉积物质量标准;重金属污染和潜在生态危害轻微;生态危害程度顺序为:Cd>Hg>As>Pb>Cu>Zn;重金属污染主要来自陆源污染源。

The distribution characteristics of heavy metals（ Cu,Pb,Zn,Cd,Hg）in surface sediments of natural reserve zone of Dugong in Hepu had been analyzed.National marine sediment quality standard were used to assess heavy metals pollution degree in surface sediments of the natural reserve zone.The potential ecological risk （PER）factors and risk indices of heavy metals were used to assess the PER of heavy metals to marine ecosystem in the natural reserve zone.The results showed that the contents of the heavy metals in surface sediments of the natural reserve zone were the first-class standard of the marine sediment quality,the pollution and PER of heavy metals were low.The heavy metals PER order was as following：CdHgAsPbCuZn. The pollution of heavy metals came from the pollution sourse of land.