摘要
本文对乐安江沉积物样品的金属总量、酸碱特性进行了测定和不同pH条件下金属的释放实验.结果表明,乐安江沉积物中Cu,Pb,Zn,Cd和As的浓度均高于一般水体沉积物的本底值.从重金属的移动性分析,存在沉积物重金属对水体产生二次污染的可能.沉积物所含重金属随pH变化产生的金属释放顺序是Zn>Cu>Cd.Pb.
The release of sediment-bound heavy metals has significant influence on the metal toxicity to aquatic life. Generally speaking, the variations of pH is one of the most important factors that affect the mobility of sediment-bound metals. In this research, we determined the metal release potential from Lean river sediment through the metal rer lease batch experiments. It have been found that the in-place Cu,Pb,Zn,Cd and As concentrations of the Lean river sediments are much higher than the normal background values along the whole river but Ni is not elevated. As should arouse further investigation. There would be the risk of second pollution in the way of mobilization of bound metals to the overlying water. The order of the metal release ratio in terms of pH dependencies is Zn>Cu>Cd,Pb.
出处
《环境化学》
CAS
CSCD
北大核心
1996年第6期510-515,共6页
Environmental Chemistry
基金
国家自然科学基金
