Research on the Distribution Characteristic and Potential Ecological Risks of Heavy Metal Pollution in the Surface Sediments of Jintang Islands

The research including Cu/Pb/Zn/Cd /Hg/Cr/As of heavy metals in the surface sediments from the sea region of Jintang Is. of Zhoushan Islands. Moreover, the degree in spatial fluctuation and accumulation of heavy metals was analyzed by using the method of variation coefficients and accumulation coefficients. The method of potential ecological risk indices presented by Lar Hakanson was used to assess the potential ecological risk of heavy metals. The Cu and Hg spatial fluctuation is highest in spring, on the contrary As and Zn was appears to be the lowest; all of the heavy metals is general uniformity in autumn. The degrees accumulation of heavy metals show the Pb is the main source of pollution, reach to moderate degree in spring and the abundant is the highest in autumn, but decline to light pollution. The assessment of potential ecological risk revealed that the potential ecological risk of these heavy metals to the ocean ecology system is very light, which belongs to light potential ecological risk level, with the order of light potential. Obviously, the risky in autumn is lower than the one in spring, that hint the combined action of the water temperature and flow field(warm current).