Sources and geographic heterogeneity of trace metals in the sediments of Prydz Bay, East Antarctica
Sources and geographic heterogeneity of trace metals in the sediments of Prydz Bay, East Antarctica
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DOI：
10.3402/polar.v32i0.20049
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发表时间：
2013-01
期刊：
影响因子：
1.9
通讯作者：
Weiping Sun;Chuanyu Hu;H. Weng;Z. Han;C. Shen;Jianming Pan
中科院分区：
文献类型：
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作者：
Weiping Sun;Chuanyu Hu;H. Weng;Z. Han;C. Shen;Jianming Pan
本研究测定了东南极普里兹湾表层沉积物中锌和镉的含量和分布。根据聚类分析、主成分分析和生物成因和岩石成因输入的考虑，讨论了微量元素的主要来源及其地理分异，以及锌和镉之间的关系。结果表明，锌和镉的痕量金属元素含量分别为34.6~96.6 mg kg−1和0.254~0.441 mg kg−1。对浓缩系数的计算表明，没有明显的人为影响。生物成因和成岩输入是痕量金属的主要来源。在埃默里冰架边缘，锌和镉的含量几乎相等，而大陆架和深海则以生物输入为主。在深海，生物输入对锌的贡献远大于对镉的贡献。对生物来源痕量金属的计算揭示了生物来源锌和生物来源镉之间的不同关系，反映了浮游植物对水体的生物吸收。
In this study, we have determined the contents and distribution of zinc and cadmium in the surface sediments from Prydz Bay, East Antarctica. The main sources of the trace elements and their geographic heterogeneity, and the relation between Zn and Cd, are discussed based on the cluster analysis, principle component analysis and considerations of biogenic and lithogenic inputs. The results show that the contents of trace metals range from 34.6 to 96.6 mg kg−1 for Zn, and from 0.254 to 0.441 mg kg−1 for Cd. Calculations of the enrichment factor indicated no significant anthropogenic impact. Biogenic and lithogenic inputs are the main sources of trace metals. They are almost equal for Zn and Cd at the Amery Ice Shelf edge, while the continental shelf and deep ocean are dominated by biogenic inputs. The contribution of biogenic inputs is much higher for Zn than for Cd at the deep ocean. Calculations of biogenic trace metals revealed different relationships between biogenic Zn and biogenic Cd, which reflect the biological uptake by phytoplankton in the water column.