乐安江沉积物对重金属的吸附模式研究──表面络合模式在天然沉积物研究中的应用  

THE ADSORPTION MODEL FOR THE LEAN RIVER SEDIMENTS ──AN APPLICATION OF THE SURFACE COMPLEXATION MODEL TO NATURAL SEDIMENT

作　　者：文湘华[1] 杜青[1] 汤鸿霄[1] 

机构地区：[1]中国科学院生态环境研究中心国家重点环境水化学实验室

出　　处：《环境科学学报》1996年第1期12-22,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金

摘　　要：应用表面络合理论及其研究方法对乐安江沉积物的表面特征及对重金属的吸附特性进行了研究．进行了乐安江沉积物样品的表面电位滴定实验及样品对重金属Ｃｕ、Ｃｄ的吸附实验．应用图解法及ＦＩＴＥＱＬ优化程序确定了表面络合模式中的相应参数，并对模式的预测能力进行了检验．研究了３种表面络合模式即恒定容量模式，扩散层模式和三层模式的拟合应用情况．结果表明，３种表面络合模式均能较好地描述天然沉积物的吸附过程，但哪种模式从化学原理上看更正确尚不能证明．从模式计算的难易程度分析，扩散层模式有一定优势．模式应用中应特别强调的是模式参数间的相关性和一致性．The surface and adsorption properties of the LeAn River sediment were modelled via surface complexation approach.The model parameters were determined based on the data from potentiometric titration experiments and the metal adsorption experiments using LeAn River sediments.Consequently, the surface complexation models for the natural sediment were estabilished. Three typical surface complexation models,the constant capacitance model, the diffuse layer model and the triple layer model,were considered. The results indicated that the consistency and the interdependency among model parametrs together with the selection of the surface adsorbed species should be emphasized.From the point of view of the simplicity in calculation,the diffuse layer model is preferred.

关 键 词：表面络合模式 沉积物 电位滴定 吸附 重有色金属 

分 类 号：X132[环境科学与工程—环境科学]