The ecological risk evaluation of heavy metals in surface sediments in artificial reefs sea area in Haizhou Bay
LU Lu1,ZHANG Shuo1,2,ZHAO Yu-qing3,ZHANG Hu4,XIANG Zai-chen1
1.College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;2.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai Ocean University,Shanghai 201306,China;3.Shanghai Science and Technology Management School,Shanghai 200200;4.Maine Fisheries Research Institute of Jiangsu,Nantong 226007,China
Abstract: The spatio-temporal profiles of heavy metals in surface sediments of artificial reefs deployed sea area in Haizhou Bay were investigated in spring(May),summer(August)and autumn(November)of 2008,and the potential ecological risk of the heavy metals were analyzed and assessed by the method of potential ecological risk index and coefficient of contamination.The results showed that the contents of Pb,Cd,Cu,Zn,Hg and As were found to be varied significantly with the seasons.There were significantly higher contents of the heavy metals in autumn than those in spring and summer,and higher near shore and lower offshore,and the maximum in control 2 in the four sampling stations,followed by in the reef 2,the next in the reef 1 and the minimum in the control 1.The coefficients of contamination of Hg and Pb were found bigger than those of other heavy metals.The level of contamination and potential ecological risk of Hg were in middle level(Ⅱ)in autumn(Nov.),while the other five heavy metals were in weak level.It was found that the artificial reef sea area in Haizhou Bay was weak pollution level according to the index of contamination and potential ecological risk.
2011, Vol. 26 
