环渤海典型海域潮间带沉积物中重金属分布特征及污染评价

对环渤海11个采样点潮间带沉积物中重金属含量进行了测定，结果表明：Cu、Cr、Zn、As、Cd、Pb的平均含量分别为14.92，31.73，73.68，11.34，0.448，21.94 mg/kg。与国内典型的河口和海湾比较，Cu、Cr、Zn、As处于相对较低水平，Cd、Pb处于中等水平。各元素的空间分布特征总体为：高值区在辽东湾，次高值区在渤海湾，低值区位于莱州湾。相关性分析表明：Cr、Cu、Zn、Cd、Pb可能具有相似的输入源，As的主要来源可能与其他几种金属不同。地累积指数法评价结果显示：Cr、Cu、Zn、As属于清洁级别，Pb处于轻度污染水平，Cd以轻度污染为主，局部海域出现偏中度、中度污染。重金属元素污染程度排序为Cd > Pb > Zn > Cu > As > Cr。潜在生态危害指数法评价结果表明：重金属对渤海生态风险构成的危害程度排序为Cd > Pb > As > Cu > Zn > Cr。Cr、Cu、Zn、As、Pb均为低生态危害等级，Cd以中等生态危害等级为主，局部海域出现强、很强、极强生态危害等级。

Distribution and pollution assessment of heavy metals in sediments from typical areas in the Bohai Sea

The content of heavy metals in sediments from 11 sampling sites in the intertidal zones around the Bohai Sea was examined. Results show that the average content of Cu, Cr, Zn, As, Cd, Pb is 14.92, 31.73, 73.68, 11.34, 0.448, 21.94 mg/kg, respectively. The content of Cu, Cr, Zn, As is relatively low and the content of Cd, Pb is at moderate level, compared to typical estuaries and gulves in China. The general content distribution of individual elements in the three bays is as following: Liaodong bay > Bohai bay > Laizhou bay. Correlation analysis indicates that Cr, Cu, Zn, Cd, and Pb may have the similar source but As may have different source . The evaluation by Geoaccumulation Index indicates that Cr, Cu, Zn, and As reach the clean grade; Pb is slightly polluted; Cd is slightly pollluted in dominant areas but in some parts it is moderately or seriously polluted.. The pollution level of the heavy metals is as following: Cd > Pb > Zn > Cu > As > Cr. The evaluation by Potential Ecological Risk Index shows that the potential ecological risk level in the Bohai bay caused by heavy metals is: Cd > Pb > As > Cu > Zn > Cr. The potential ecological risk of Cr, Cu, Zn, As, Pb is at low level, while Cd is mostly at medium risk level but at serious level in some areas.