长江口及其邻近海域表层沉积物中部分金属元素赋存形态研究

发布时间：2018-07-28 10:48

【摘要】：2014年6月在长江口及其邻近海域采集了表层沉积物样品,用连续提取法对Cr、Co、Ni、Cu、Zn、Al、Mn和Fe金属元素的赋存形态进行分离,即分作可交换态(EXC)、碳酸盐结合态(CARB)、铁锰氧化物结合态(ERO)、有机结合态(OSM)和残渣态(RES)并测定了含量。结果表明,长江口及其邻近海域表层沉积物中的Cr主要赋存在OSM态中,Mn主要赋存在CARB态中,Ni在OSM态和ERO态含量相当,Co、Cu、Zn、Al和Fe元素主要赋存在ERO态中。长江口及其邻近海域D断面表层沉积物中Cr、Co、Ni、Cu、Zn、Al、Mn和Fe元素的非残渣态含量随着离岸距离的增加而逐渐降低。ERO态金属元素随着沉积物中铁锰水合氧化物的含量的升高而增加,且ERO-Cr、Co、Ni、Cu、Zn、Al与铁锰水合氧化物含量之间有较好的相关性,说明这些金属元素受到铁锰水合氧化物的影响。各金属元素非残渣态总量与ERO-Fe含量之间相关性也较好,说明各元素非残渣态受控于其各自主要的赋存形态。
[Abstract]:The surface sediment samples were collected in the Changjiang Estuary and its adjacent sea area in June 2014. The occurrence forms of mn and Fe metal elements were separated by continuous extraction method. It was divided into exchangeable (EXC), carbonate bound (CARB), iron-manganese oxide bound (ERO), organic bound (OSM) and residue (RES) and the content was determined. The results show that the Cr in the surface sediments of the Yangtze Estuary and its adjacent sea areas are mainly located in the OSM state and the CARB state, and the content of Ni in the OSM state is similar to that in the ERO state. The main elements of Cr in the surface sediments of the Yangtze River Estuary and its adjacent waters are in the ERO state. In the surface sediments of the D section of Yangtze River Estuary and its adjacent waters, the contents of non-residuals in the surface sediments of Cr-CoCo-NiCuCuOZnAlOMN and Fe gradually decrease with the increase of the distance from shore. The content of iron-manganese hydrates increases with the increase of the contents of iron-manganese hydrates in the sediments of the Yangtze Estuary and its adjacent waters. There is a good correlation between the content of iron and manganese hydrates and the content of iron and manganese hydrates, which indicates that these metal elements are affected by the hydrated oxides of iron and manganese. There is also a good correlation between the total amount of non-residue state and the content of ERO-Fe of each metal element, which indicates that the non-residue state of each element is controlled by their main occurrence forms.
【作者单位】：中国海洋大学化学化工学院;海洋化学理论与工程技术教育部重点实验室;中国海洋大学海洋地球科学学院;
【基金】：国家自然科学基金(41576078) 山东省自然科学基金(ZR2015DM006)资助
【分类号】：P736.4;X55

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