锦州湾表层沉积物中铅、锌、镉在各地球化学相间的分配规律

研究了受重金属严重污染的锦州湾内表层沉积物中铅、锌、镉在各地球化学相间的含量,及其在湾内河水-海水混合界面附近各相间的迁移转化特征。结果表明,锦州湾表层沉积物中上述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由水环境的E_H和pH控制;在污染源附近的海区,表层沉积物中重金属在非残渣相和残渣相间的比值与近岸锌厂排出的这些重金属在废水和废渣中的含量比呈正相关关系。

PARTITIONING OF LEAD, ZINC AND CADMIUM IN SURFACE SEDIMENTS FROM JINZHOU BAY

The fractionation f lead,zinc and cadmium in sediments from Jinzhou Bay and the translocation of the metals among different fractions in the polluted surface water and sea water mixing area were investigated. A majority of the metals were found to be bound to the non-residual fractions among which Fe-Mn oxides was the most important one. The ratio of metal contents in the nonresidual phase to that in the residual phase in sediments from near shore area closed to pollution sources was correlated to the ratio of the metal concentration in wastewater to that in the sludge. It was also noticed that the metal partitioning between Fe-Mn oxides and carbonates was mainly controlled by EH and pH conditions of the aquatic environment.