由pH值改变引起的水环境多种固相物质共存体系中重金属的再分布行为

构建了重金属在水环境多种固相物质（包括生物膜、 沉积物、 颗粒物）共存体系中分布行为的模拟体系, 进而研究pH值改变引起的Pb,Cd,Cu在
此共存体系中的再分布行为. 结果表明, 平衡体系pH值的改变会显著影响3种重金属在各固相物质中的分布特征, 使重金属在体系中发生再分布. 再分布过程由一个快速吸附 解吸阶段和一个缓慢接近平衡阶段组成, 并可以用Langmuir吸附 解吸动力学方程描述. 研究结果还表明, 在pH值降低时Cd的变化特征与Pb,Cu有一定差异, 而Pb的变化特征则在pH值升高时, 与Cd,Cu表现出一定的差异.

Redistribution of Heavy Metals Caused by pH Value Change in the Coexistence System of Solid Phases of the Aquatic Environment

The authors constructed the simulation system of heavy metals' distribution in the coexistence system of solid phases(including the biofilm,the sediment,the suspended solid) in the aquatic environment,and studied the redistribution behavior of Pb,Cd,Cu caused by pH value change in the coexistence system.The result shows that the pH value change of the balanced system could markedly affect the distributing characteristics of these three heavy metals in the solid phases,which enabled the heavy metals to redis...