生态环境学报2016，Vol.25Issue(3)：464-470,7.DOI:10.16258/j.cnki.1674-5906.2016.03.014
南海北部近海沉积物重金属分布及来源
Distribution and Sources of Heavy Metals in Surface Sediments, Northern South China Sea
摘要
Abstract
About 4000 sediment samples have been grabbed from the bottom of the northern South China Sea to further understanding distribution and sources of heavy metals. Grain sizes of all samples have been measured by the composition of Mastersizer 2000 and sieving method, the content of heavy metals for more than1000 samples have been tested by ICP-AES (samples from Pearl River Estuary) and ICP-MS (samples from other parts), and the distribution and relationship between the content of four heavy metals (Cu, Pb, Zn and Cr ) as well as the mean of the grain size have been analyzed. The results indicate similar distribution of four heavy metals (Cu, Pb, Zn and Cr), with relative high values are mainly came from the Pearl River Estuary declining to the west. Compared to the Chinese first-class sediment standard, regions of above-standard Pb and Zn are mainly distributed in the Pearl River Estuary and offshore to the west of Hailing Island. Above-standard of Cu and Cr values are distributed from Pearl river estuary to Yangjiang sea area alongshore, and above-standard Cr is also distributed widely in Beibu Gulf. There is a strong correlation between the four heavy metals, indicating that the elements have the same origin, with the gradient indicating the source up the Pearl River. We also found four heavy metal enrichment areas in the northern South China Sea alongshore area, and analyzed the source and formation mechanism combine with the ocean currents in this region. We conclude that the heavy metals around Qiongzhou Strait mainly derive from Pearl River, with the most distal deposits to the east of Beibu Gulf. Pollution characteristics and ecological risk have been evaluated by the Hakanson potential ecological risk model. The results show that there are three middle level risk areas in the studied region, which spread mainly from the Pearl River Estuary to the west of Hailing Island.关键词
重金属/沉积物/粒度/物源/南海北部Key words
heavy metal/sediment/grain size/provenance/north of South China Sea分类
资源环境引用本文复制引用
陈亮,李团结,杨文丰,陈静..南海北部近海沉积物重金属分布及来源[J].生态环境学报,2016,25(3):464-470,7.基金项目
我国近海海洋综合调查与评价专项（908-01-CJ14至 CJ17）；国家海洋局南海分局海洋科学技术局长基金项目（1315）；中国科学院边缘海地质重点实验室开放研究基金项目 （）
