生态环境学报Issue(3)：452-456,5.DOI:10.16258/j.cnki.1674-5906.2015.03.012
渤海湾表层沉积物重金属含量及潜在生态风险评价
Contents and Potential Ecological Risk Assessment of Selected Heavy Metals in the Surface Sediments of Bohai Bay
摘要
Abstract
The release of the heavy metals from the sediments might significantly contribute to the water environment and ecological health of the sea. Contents of selected heavy metals (Hg, As, Cu, Zn, Pb, Cd, Cr) in the surface sediments from 24 sites in the Bohai Bay were measured in August of 2013, and their potential ecological risk were evaluated through Hankanson method. Results showed that the average content of the heavy metals in the sediment of Bohai Bay reached the first standard request of the national marine sedimentary evaluation criterion (GB-18668-2002), with the average values of Hg, As, Cu, Zn, Pb, Cd, Cr of 0.03, 16.15, 23.15, 89.45, 38.84, 0.24 and 60.60 mg·kg-1 respectively. A percentage of 83.3% of the sampling sites meet the first standard request of the national marine sedimentary evaluation criterion, and the rest of the sites were qualified for the second standard. According to the result, the main heavy metals exceeded the first standard of the criterion were As and Pb. Further ecological risk assessment result showed that the average ecological risk index value in different sites was 95.01, which represented a low ecological risk. The potential ecological risk caused by heavy metals decreased following the sequence of Cd, Hg, As, Pb, Cu, Cr and Zn, and all the metals except Cd caused a low ecological risk. The potential ecological risk index caused by Cr reached 47.00, representing a moderate ecological risk, which contributed around 49.5% of the total potential ecological risk. The high ecological risk of the Cd could be explained by high respond to its high biotoxicity and rapid accumulation in the sediment. Higher potential risk of heavy metals were detected in the sediments near estuary and Tianjin port industrial region, while lower ecological risk of heavy metals was detected in the southern fishing region and the center of the Bohai Bay, which indicated that the potential risk of heavy metals was probably caused by industrial activity and land source pollution in Bohai Bay. Therefore, it is of great importance to adjust the industrial pattern in the offshore and control the discharge of the heavy metal (especially Cd) through river inflow and economic activity to protect the ecological security of the sediments in Bohai Bay.关键词
重金属/生态风险评估/沉积物Key words
heavy metal/ecological risk assessment/sediment分类
资源环境引用本文复制引用
周笑白,梅鹏蔚,彭露露,韩龙,张震..渤海湾表层沉积物重金属含量及潜在生态风险评价[J].生态环境学报,2015,(3):452-456,5.基金项目
国家环境保护公益性行业科研专项项目 （）
