对海南岛周边海域表层沉积物中7种分散元素镓(Ga)、锗(Ge)、铷(Rb)、铊(Tl)、镉(Cd)、碲(Te)和硒(Se)的分布与富集特征,及其与沉积物粒度、总有机碳和有机氮的相关性进行了较系统的分析,并分别利用内梅罗综合指数法和污染负荷指数法对这些元素的污染情况进行了初步评价。结果表明,分散元素的富集与沉积物粒度、有机碳和有机氮的含量有密切关系,除Te外,其它6种分散元素均表现出在粉砂或黏土质,以及有机碳和有机氮含量高的沉积物中趋于富集;沉积物的分散元素污染总体上呈轻微程度,但在局部海域(如海南岛西北部、西部、东南部近海海域以及陵水和三亚段海域)接近中等污染程度,说明这些区域受人类活动的影响较大,应引起海洋环境保护主管部门的重视。
Abstract
The distribution and enrichment characteristics of seven dispersed elements ( Ga, Ge, Rb, Tl, Cd, Te and Se ) in the surface sediments around Hainan Island waters were analyzed and their correlations with sediment grain size, total organic carbon and organic nitrogen were also studied. Nemerow Comprehensive Evaluation Index and Pollution Load Index methods were used respectively to preliminarily evaluate the contamination of these elements. The results show that the dispersed elements enrichment has close relation with sediment grain size, organic carbon and organic nitrogen content. Except Te, the other six kinds of dispersed elements have shown high enrichment in silt or clay sediments, and they tend to concentrate in the sediment where organic carbon and organic nitrogen contents are high. In general, the dispersed element pollution degree is a slight, but in some sediments (such as the sediments from northwest, west, southeast coastal waters and from Lingshui and Sanya waters of Hainan Island), the pollution reaches to the moderate degree, indicating that these areas have been impacted by human activities seriously, which should attract the attention of the competent authorities for the marine environment protection.
关键词
海南岛 /
近海沉积物 /
分散元素 /
污染评价
Key words
Hainan Island /
coastal sediments /
dispersed elements /
pollution assessment
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基金
国家自然科学基金项目资助(40776037);国家海洋公益性科研专项经费项目资助(201205008,200805063-3);我国近海海洋综合调查与评价专项项目资助(908-ZC-Ⅱ-05)
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