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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。
In June 2014, samples of surface sediments were collected from the Yangtze Estuary and its adjacent sea areas. The continuous extraction method was used to separate the occurrence patterns of Cr, Co, Ni, Cu, Zn, Al, Mn and Fe metal elements EXC, CARB, ERO, OSM and RES were measured and the contents were determined. The results showed that Cr in the surface sediments of the Changjiang Estuary and its adjacent sea areas mainly existed in the OSM state, while Mn mainly existed in the CARB state. The content of Ni in the OSM and ERO was similar, while that of the Co, Cu, Zn, Al and Fe The main presence in the ERO state. The non-residual content of Cr, Co, Ni, Cu, Zn, Al, Mn and Fe in D sediments in the Changjiang Estuary and its adjacent waters decreased with the increase of the offshore distance. ERO metal elements increased with the content of FeMn hydrate oxides in sediments, and there was a good correlation between ERO-Cr, Co, Ni, Cu, Zn, Al and FeMn hydrous oxides , Indicating that these metal elements are affected by Fe-Mn hydrated oxides. The correlation between the total non-residue state of the metal elements and the ERO-Fe content is also good, indicating that the non-residue states of the elements are controlled by their respective dominant forms.