长江口海域悬浮颗粒物中铜、铅、镉的化学形态及分布特征研究

研究了重金属Cu,Pb,Cd在长江口及其邻近海域悬浮颗粒中各化学形态间的含量,及其在长江内河段—河海混合界面—海区间的各形态间的迁移转化特征。结果表明,长江口海域中重金属以非残渣相为主要存在形式,其中铁锰氧化物为重要的清除载体;以铁锰氧化物和碳酸盐形式存在的重金属含量受水环境盐度和pH控制;通过多元回归计算求得重金属与pH值、盐度(X_s)、悬浮体(X_(s.s))的多元一次方程。

A STUDY ON THE DISTRIBUTIVE CHARACTERISTICS OF CHEMICAL FORM OF Cu, Pb AND Cd IN SUSPENDED PARTICULATE IN CHANG JIANG RIVER ESTUARY

The distribution and translocation of chemical forms of Cu, Pb and Cd in the suspended particulate of the ChangJiang River Estuary were investigated.The results show that the major form of the heavy metal were non-residual fractions, Fe-Mn oxides were the most important one from the suspension. Fe-Mn oxides and carbonates were mainly controlled by salinity and pH conditions of the aquatic environment. The mul-tivariate linear equation of the heavy metals with pH(XpH), S.S.(Xs.s), salinity(Xs)was obtained through multivariated regression computation.