深圳湾沉积物重金属污染时空分布特征

发布时间：2018-03-23 00:22

本文选题：深圳湾　切入点：沉积物　出处：《海洋环境科学》2017年02期 　论文类型：期刊论文

【摘要】：根据1992~2013年间深圳湾沉积物的监测数据,重点分析了重金属砷(As)、镉(Cd)、铬(Cr)、铜(Cu)、铅(Pb)、汞(Hg)和锌(Zn)含量、来源、相关性、污染程度和生态风险等污染状况。深圳湾沉积物中重金属含量存在明显的时空分布特征。1992~2013年间,深圳湾尤其是近岸海域,沉积物重金属含量的基本变化趋势为先增加后下降,重金属含量在2000~2009年间相对较高;Cd、Cr、Cu、Pb、Hg和Zn的含量从湾内到湾口逐渐降低。重金属Cu、Pb、Zn和As的富集因子指数较高,说明这4种重金属主要来自人类活动。Cd、Cr、Cu、Pb和Zn之间存在明显的相关性,具有相似污染途径和迁移过程。深圳湾底泥中重金属Pb、Zn和Cu属于轻微污染程度,其他重金属为无污染程度。深圳湾沉积物重金属的生态危害程度为轻微生态风险,重金属中Hg的生态风险指数最高,As和Cd次之。
[Abstract]:Based on the monitoring data of sediments in Shenzhen Bay from 1992 to 2013, the contents, sources and correlations of heavy metals, such as arsenic, cadmium, cadmium, chromium, cr, Cu, Pb, Hg and Zn, were analyzed. Pollution degree and ecological risk. Heavy metal contents in sediments of Shenzhen Bay showed obvious temporal and spatial distribution characteristics. During 1992 and 2013, the basic trend of heavy metal content in sediments of Shenzhen Bay, especially in coastal waters, increased at first and then decreased. The content of heavy metals decreased gradually from the inside of the bay to the mouth of the bay, and the enrichment factor index of Zn and as was higher, which indicated that the four heavy metals mainly came from the human activities. There was a significant correlation between Pb and Zn in the Cu / Zn. The heavy metals Pb, Zn and Cu in the sediment of Shenzhen Bay belong to the degree of slight pollution, while the other heavy metals are non-polluted. The ecological hazard degree of heavy metals in sediments of Shenzhen Bay is slight ecological risk. The ecological risk index of Hg in heavy metals was the highest, followed by as and CD.
【作者单位】：清华大学深圳研究生院深圳市环境微生物利用与安全控制重点实验室;深圳市规划国土发展研究中心;爱尔兰圣三一学院土木结构与环境工程系;
【基金】：2015年深圳市规划国土前期费项目
【分类号】：X55

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