渤海中部海域黏土粒级沉积物中重金属的变化及其对160年来人类活动的指示

Changes in heavy metals in clay-grain sediments in the Bohai Sea and their indication of human activity over the past 160 years

本文对渤海中部海域B62孔51个沉积物样品黏土粒级沉积物中重金属地球化学指标进行了分析,探讨了重金属含量变化的影响因素,并对渤海中部海域近160年以来人类活动与重金属的关系进行了阐述。结果表明,1855年黄河改道事件造成的沉积物物源变化和人类活动是研究区重金属含量变化的主要影响因素;通过相关性分析和主成分分析提取出了Cu、Pb和Cd等指示人类活动的有效指标,进而阐述了近160年以来渤海中部海域人类活动与重金属的相互关系;潜在生态危害指数法评价结果表明,研究区自1855年以来一直处于低微生态风险水平,但由于人类活动的影响其潜在生态风险指数RI显著增加。

Based on the analysis of the geochemical indexes of heavy metals in 51 sediment samples with B62 in the central Bohai Sea,the influencing factors of the change of heavy metals content were discussed,and the relationship between human activities and heavy metals in the central Bohai Sea over the past 160 years was expounded.The results show that the changes of sediment provenance caused by the diversion of the Yellow River in 1855 and human activities are the main factors affecting the changes of heavy metal content in the central Bohai Sea.Through correlation analysis and principal component analysis,We extracted effective indicators(e.g.Cu,Pb and Cd)indicating human activities,then elaborated the relationship between human activities and heavy metal elements in the central bohai Sea over the past 160 years At the same time,the potential ecological hazard index method was used to evaluate the heavy metal pollution in the central Bohai Sea.The results showed that the study area had been at a low microecological risk level since 1855,but RI significantly increased due to the impact of human activities.