福建近岸浅海沉积物元素丰度及含量变化特征

Characteristics of the Elemental Abundance and Content of Near-shore Neritic Sediment in Fujian Province

通过福建省沿海经济带生态地球化学调查,在福建近岸浅海区域共采集479件沉积物样品,分析测试了52种化学元素以及pH值和有机碳等指标。总结了该区域浅海沉积物化学元素的丰度、含量变化及其区域分布,并分不同沉积物类型统计有害元素的污染起始值。福建近岸浅海沉积物与中国浅海沉积物对比,大部分元素的含量高于中国浅海沉积物,含量变化基本遵循"元素的粒度控制律",除Si元素相反外,Al、Fe、Cu、Co、Ni等绝大多数元素的含量随沉积物粒度变细(砂→粉砂→泥)而升高,有些元素在泥质沉积物中的含量常高出砂质的数倍;其高值、高背景区的区域分布也总是与细粒沉积物有关,而低值、低背景区则明显地与砂质沉积物的分布相关。

During the eco-geochemical survey of the inshore economic zone in Fujian Province, the 479 sediment samples are collected from the neritic region near the shore of Fujian Province, and the 52 chemical elements, the pH values and the organic carbon from the samples are under analyses and testing. In the paper it makes an assay of the abundance, content and regional distribution of chemical elements from neritic sediments in the surveyed area and counts the pollution start values of hazardous elements according to the different sediment types. By contrast with the China neritic sediments, the most of elemental contents of neritic sediments alongshore in Fujian Province are higher. The diversification of elemental contents approximately follows by the elemental particle-size control law. Except for the sillcon element, the most of elemental contents such as Al, Fe, Cu, Co and Ni gradually increase with the thinningdown of grain size of the sediments. The content of some elements from the argillaceous sediment are higher several times than the sandy sediment. The regional distribution of high values and high background is always relative to the fine-grained sediments, and the distribution of low values and low background is obviously associated with the sandy sediments.