摘要
重金属因其特殊的地球化学性质、毒性效应、高度危害性和难治理性成为环境中具有潜在危害的重要污染物。众多学者依据地质累积指数法、富集因子法及潜在生态危害指数法等对重金属污染程度进行了评价,依据元素相关性、主成分分析法、富集因子和聚类分析对重金属污染来源进行了探讨,初步定性了解了重金属污染来源,但还未做到定量区分重金属污染源。沉积物中的多环芳烃主要反映的是人类活动对海洋环境的影响,而元素Ti是陆壳岩石、土壤及其风化产物的主要成分,在海洋环境中不存在自生富集现象,海洋沉积物中的Ti通常被认为全部来自陆源碎屑物质,因此,利用重金属元素与多环芳烃和元素Ti的相关性可以有效地区分重金属污染源。
Heavy metals have been referred to as a kind of the most harmful pollutants in marine sediments due to their special geochemical properties,toxicity,high vulnerability and difficulty in management.Evaluation of the pollution level of heavy metals have been made by scholars with various proxies,such as geological accumulation index,enrichment factors,ecological risk index and pollution sources of the heavy metals based on elements correlation,principal component analysis,enrichment factor study and cluster analysis.As the result,preliminary qualitative understanding is achieved,but quantitative distinction on pollution sources of the heavy metals remain unsolved.Polycyclic aromatic hydrocarbon in sediments is regarded as a proxy of human activity for marine environment,while the element Ti,which is usually not enriched in marine environment,is mainly from continental rocks,soils,and their weathering products,and generally considered as the indicator of terrigenous clastic materials.Therefore,the correlations among heavy metals,polycyclic aromatic hydrocarbons and elements Ti can be effectively used to distinguish the heavy metal pollution source.
出处
《海洋地质前沿》
2012年第11期47-52,共6页
Marine Geology Frontiers
基金
国土资源部海洋油气资源与环境地质重点实验室开放基金项目(MRE201229)
关键词
沉积物
重金属
污染源
sediments
heavy metals
sources of pollution
