小海高位池沉积物中重金属分布与污染评价

通过分析8个小海高位池养殖区的采样点沉积物中7个典型重金属污染物的含量,采用单因子指数法和Hakanson生态风险指数法,定量确定养殖池沉积物中重金属的污染程度和潜在生态风险程度。结果表明,沉积物中主要的重金属污染因子是Cu、Pb,污染指数分别为1.14和1.08;其重金属影响因子的顺序为CuPbCdHgZnCrAs,属于轻度污染;主要潜在生态风险因子为Cd,各种重金属的潜在生态危害系数大小顺序为CdHgCuPbAsCrZn,潜在生态风险指数RI平均值为41.12,属于低潜在生态风险。

Distribution and Pollution Assessments of Heavy Metals in Sediments from High-level Breeding Pond Zone, Xiaohai Bay, Hainan

According to analysis of the contents of the typical heavy metals pollutants in the sediments of 8 samples that collected from high-level breeding pond zone,the single factor index method and Hakanson ecological risk were used to quantitatively determine the extent of pollution and the potential ecological risks of heavy metal in the sediments of high-level breeding pond zone.Result showed that the main factor of the heavy metal pollution were Cu and Pb whose pollution indexes are 1.14 and 1.08 respectively.The sequence of factor index is Cu>Pb>Cd>Hg>Zn>Cr>As.The environment of the zone is assessed as slight pollution according to the single factor index method.The major factor of potential ecological risk is Cd.The order of the potential ecological risk is Cd>Hg>Cu>Pb>As>Cr>Zn,and average potential ecological risk is 41.12.Therefore,high-level breeding pond zone is evaluated as slight potential ecological risk.