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根据2009年8月在舟山附近海域采集的表层沉积物中6种重金属的检测结果,利用变异系数法、单种重金属污染指数法、多种重金属综合污染指数法,对表层沉积物中各重金属的空间波动及污染程度进行了分析,并利用Hakanson潜在生态危害指数法对单种和多种重金属的潜在生态危害程度进行了评价。结果表明:表层沉积物中重金属平均含量顺序依次为Zn>Cu>Pb>As>Cd>Hg;空间波动程度顺序依次为Cd>Hg>Pb>Zn>As>As;污染程度顺序依次为Cd>As>Cu>Zn>Pb>Hg,其中,重金属Cd的污染程度最高,属于中等污染水平,其余重金属均属于低污染水平,6种重金属的综合污染程度属于低污染水平。表层沉积物中各重金属对海洋生态系统的潜在生态危害较轻微,均属于轻微潜在生态危害程度,其潜在生态危害程度顺序依次为Cd>Hg>As>Cu>Pb>Zn;多种重金属综合潜在生态危害均属于低潜在生态风险水平。
According to the detection results of six heavy metals in surface sediments collected from the sea near Zhoushan in August 2009, the method of variation coefficient, single heavy metal pollution index and comprehensive index of heavy metals pollution were used to analyze the contents of heavy metals in surface sediments Spatial fluctuation and pollution degree were analyzed. The potential ecological risk of single and multiple heavy metals was evaluated by Hakanson potential ecological risk index. The results showed that the average contents of heavy metals in the surface sediments were Zn> Cu> Pb> As> Cd> Hg, the order of spatial fluctuation was Cd> Hg> Pb> Zn> As> As> Cu> Zn> Pb> Hg. Among them, the pollution level of heavy metal Cd was the highest, belonging to the medium pollution level, while the rest of the heavy metals belonged to the low pollution level. The comprehensive pollution degree of the six heavy metals belonged to the low pollution level. The potential ecological risk of heavy metals in surface sediments to marine ecosystem is minor, and all of them are minor potential ecological hazards. The order of potential ecological risk is Cd> Hg> As> Cu> Pb> Zn. The potential of multiple heavy metals Ecological hazards are low potential ecological risk level.