基于沉积柱的渤海湾金属的垂向分布特征及来源分析

Vertical Distribution and Source Analysis of Metals in Bohai Bay Based on Sedimentary Cores

  • 摘要:  本研究通过测定渤海湾西部近岸柱状沉积物样品的粒度、常量金属及重金属(Al、Ca、Cr、Cu、Fe、K、Mg、Mn、Na、Zn、Cd、Pb、Sb、Hg)含量,研究了渤海湾金属的垂向分布特征及1970年建闸前后重金属来源的变化。结果表明,沉积物以粉砂和黏土为主,粒径Φ值范围4.83-6.69。因子分析以及归一化分析表明,随着海河流域入海河流防潮闸陆续完成,从上世纪六十年代末七十年代初开始,入海口附近海域金属由人为活动转为以自然地球化学过程主导。而沿岸工业区附近海域工业排放等人为活动仍是主要污染源,表明了金属在不同沉积环境下的累积特征呈显著时空差异性。

     

    Abstract:  In this study, we investigated the vertical distribution of metals in Bohai Bay and analyzed the changes in heavy metal sources before and after the construction of a dam in 1970. This was accomplished by measuring grain size as well as the concentrations of major metals and heavy metals (Al, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Zn, Cd, Pb, Sb, Hg) within coastal column sediments located in western Bohai Bay. The results indicate that the sediment is predominantly composed of silt and clay with particle sizes ranging from 4.83 to 6.69 micrometers. Factor analysis and normalization techniques reveal that following the completion of moisture-proof gates for rivers discharging into the sea within the Haihe River Basin during this period—specifically from the late 1960s to early 1970s—the metal concentrations in marine areas near estuaries were primarily influenced by natural geochemical processes. Nevertheless, anthropogenic activities such as industrial emissions continue to represent significant pollution sources. The findings indicate that the accumulation characteristics of metals in various sedimentary environments exhibit significant temporal and spatial variations.

     

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