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  

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

作　　者：李仁声[1,2] 花修艺[1] 董德明[1] 王文涛[1] 高文武[1,3] 张广鑫[1] 

机构地区：[1]吉林大学环境与资源学院,长春130012 [2]长春市环境监测中心站,长春130022 [3]长春市环境保护局,长春130022

出　　处：《吉林大学学报（理学版）》2009年第4期852-858,共7页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20877033;20477014);高校博士学科点专项科研基金(批准号:20060183020)

摘　　要：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.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 redistribute in system. The redistributing processes were all composed of an initial rapid adsorption-desorption stage and a stage slowly closing to balance, which could be described via the Langmuir adsorption-desorption kinetic equation. The research also indicated that the changing characteristics of Cd differed from those of Pb and Cu on pH value decreasing, and the changing characteristics of Pb displayed difference from those of Cd and Cu on pH value increasing.

关 键 词：PH值 生物膜 沉积物 颗粒物 重金属 再分布 

分 类 号：X13[环境科学与工程—环境科学]