山东长岛海域浅层沉积物重金属污染特征及成因分析OA

Heavy metals in shallow marine sediments are easy to diffusion during offshore engineering con-struction.It will lead to environmental changes and even marine pollution.Therefore,the determination of heavy metal contents is an important indicator for evaluating the impact of offshore engineering con-struction on the marine environment.Taking shallow sediments in the northern sea area of Changdao in Shandong province as the research object,7 heavy metals,14C and 7 major components in 60 shallow sedi-ment samples from boreholes have been collected and determined.The pollution degree and potential eco-logical risk of heavy metals have been evaluated by using geoaccumulation index and the potential ecologi-cal risk index respectively.It is showed that heavy metals in Borehole HG2 are at non-pollution to slight pollution levels,with moderate to low single factor potential risk and low comprehensive potential ecologi-cal risk index.Heavy metals in Borehole HG6 are mainly non-pollution to slight pollution,while Cu(13%)and As(3%)are locally at moderate to relatively moderate pollution.The single factor potential risk is mainly moderate to low,whereas Cu(13%)is at high to very high risk locally,and comprehensive potential ecological risk index is low.The sources of heavy metals in sediments of the study area are multi-source and terrigenous,and their contents are mainly affected by sediment sources.In general,the con-tents of heavy metals in the study area are relatively low,comprehensive potential ecological risk is low,and the disturbance caused by offshore engineering construction has a slight impact on heavy metal con-tents in the marine environment.