连云港近海沉积物重金属历史分布特征及其来源

发布时间：2018-05-06 03:09

本文选题：沉积物 + 重金属　；参考：《水生态学杂志》2016年06期

【摘要】：分析连云港近海沉积物中的重金属含量,探讨不同功能区沉积物重金属污染演变规律、来源及其对环境造成的影响,为合理规划用海提供科学依据。选择连云港海域临洪河口河心浅滩、西连岛潮下带和灌河口北岸潮滩这3种不同的功能区为研究对象,于2014年在每个功能区各采集了1个沉积物柱状样,进行了测年和重金属Cd、Cr、Cu、Mn、Ni、Pb、Zn含量测定来分析重金属污染历史分布特征,并运用地累积指数和主成分分析说明了连云港近海不同功能区重金属污染水平和污染物来源。结果表明:1)20世纪90年代开始,各柱状样重金属污染水平出现明显的波动。2005年之后,临洪河口沉积物重金属污染水平呈现逐年下降趋势,灌河口沉积物重金属污染水平则呈波动上升趋势。2)根据地累积指数,连云港近海沉积物多数重金属污染水平处于轻度-中等污染水平,少数处于无污染状态或中等污染水平。3)重金属富集系数表明,沉积物中重金属污染受到人类活动的显著影响。相关性和主成分分析表明,临洪河口重金属来源较为多样,其次为连岛,灌河口重金属来源则较为单一。
[Abstract]:The contents of heavy metals in the offshore sediments of Lianyungang are analyzed. The evolution law of heavy metal pollution in sediments of different functional areas, its source and its impact on the environment are discussed, which provides a scientific basis for the rational planning of the use of sea. Three different functional areas of Lianyungang sea area, namely, river-core shoal, Xilian island subtidal zone and northern tidal beach of Guankou, were selected as the research objects. One sediment column sample was collected in each functional area in 2014. The history distribution characteristics of heavy metal pollution were analyzed by means of dating and determination of the heavy metal content of CdCrCrCrCuMnMnNiPbN Zn, and the pollution level and source of heavy metals in different functional areas of Lianyungang coastal waters were explained by ground accumulation index and principal component analysis. The results show that the pollution level of heavy metals in the columnar sediments has fluctuated obviously since 1990's, and the pollution level of heavy metals in sediments of Linghong estuary has been decreasing year by year since 2005. The pollution level of heavy metals in the sediments of Guanhekou showed a fluctuating upward trend. 2) based on the accumulation index, most heavy metal pollution levels in Lianyungang offshore sediments were mildly to moderately polluted. The enrichment coefficient of a few heavy metals in non-polluted or moderate pollution level indicates that heavy metal pollution in sediments is significantly affected by human activities. Correlation and principal component analysis showed that heavy metals in Linhong estuary came from various sources, followed by Liandao, and heavy metal sources in Guanhekou were relatively single.
【作者单位】：江苏省海洋生物技术重点实验室;淮海工学院测绘与海洋信息学院;
【基金】：国家自然科学基金项目(41306114) 2016江苏省青蓝工程江苏省海洋生物技术重点实验室开放课题(2013HS008) 江苏省海洋科学与技术优势学科建设工程资助项目(5511201401X)
【分类号】：X55

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