【摘要】 <正> 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.吴瑜端等调查了长江口汞、铜和铬的转移规律更多还原

【Abstract】 The distribution of mercury, copper, lead, zinc and chromium contents in the estuarine sediments of the Changjiang River and the influence of environmental factors 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.It is found that there is a good correlation between heavy metals contents, environmental factors grain size of sediment,salinity of sea water, Fe2O3 and organic matter content of sediments. Multivariate analysis technique has been employed to identify the predominant factors controlling the distribution of individual element in sediments. For mercury, the dominant factors are grain size of sediment, salinity of sea water and organic matter content in sediments; for copper, grain size of sediment; for lead, grain size of sediment, salinity and Fe2O3 content in sediments; for zinc, grain size of sediment and Fe2O3 content; and for chromium, Fe2O3 content in sediments.The regression equations of the concentrations of heavy metals in the Changjiang River are as follows:Hg(ppb)=5.3MdΦ-0.40 S(‰)+20 org.(%)+5.2 (r=0.83),Cu(ppm) =2.77MdΦ + 4.6 (r = 0.82),Pb(ppm) = 1.42MdΦ + 0.169 S(‰) + 2.35Fe2O3(%) -2.2 (r=0.84), Zn(ppm) = 4.43MdΦ, + 9.28Fe2O3(%)+38.0 (r = 0.86), andCr(ppm) = 12.9Fe2O3(%)-15.0 (r=0.67).更多还原