长江口沉积物中重金属的含量分布及其与环境因素的关系

长江是我国最大的河流,全长6,300公里,径流量每年达1万亿立方米,同时,携带着5亿吨的泥沙和溶解矿物进入东海水域.长江入海处有中国最大的城市上海,每年有大量的工业和生活污水流入长江口.因此,研究长江口沉积物中重金属的含量分布,对于环境污染和河口沉积过程的研究是有意义的.

STUDIES OF HEAVY METALS IN THE ESTUARINE SEDIMENTS OF THE CHANGJIANG RIVER

The distribution of mercury, copper, lead,zinc and chromium contents in the estuarine sediments of the Changjiang River and the influence of environmental factoys on them are described in this paper. Except chromium, distribution of heavy metals, Fe₂O₃ and organic matter in the estuarine sediments of the Changjiang River appear to be low-high-low from the estuary to the seaward end of the estuary with increasing salinity of sea water, while the grain size of sediments appear to be coarse-fine-coarse. Their peak values occur in the range of salinity 17-21‰.And these are mainly due to the complex influence of wave, tide, current, eddy, flocculation and adsorption-desorption on sediments.The conditions for the distribution are: (i) almost no pollution in the estuary, and (ii) a stronger current passing the outer flank of the estuary.