长江口海域悬浮颗粒物中钴、镍、铁、锰的化学形态及分布特征研究

FRACTIONATION OF CO,Ni,Fe,AND Mn IN SUSPENDED PARTICULATE FROM CHANGJIANG RIVER ESTUARY

研究了重金属Co、Ni、Fe、Mn在长江口及邻近海域悬浮颗粒中的含量、存在形态以及它们在河水与海水混合过程中迁移转化特征,其变化动态特征表明,Co、Ni、Fe以残渣态为主要存在形式;由于Fe-Mn氧化物的形成和吸附作用,使上述金属从水体经过悬浮颗粒转到沉积物中;以Fe-Mn氧化物和碳酸盐形态存在的重金属含量受水体环境的pH和盐度制约。用多元回归分析求得不同形态重金属含量与盐度、pH值和悬浮物含量的变化方程,以及与环境要素间的相互关系。

The Co,Ni,Fe,and Mn in suspended particulate from Changjiang River Estuary were fractionated using Tessier's procedure. The majority of metals except Mn were found to be in residual fraction. The Fe-Mn oxides is the most important carrier for the metals transporting from water column to sediment. The amount of metals bound to Fe-Mn oxides and carbonates are controlled by salinity and pH. The multivariate regression equations were established for the metal fractions and pH, salinity and suspended par-ticulate.