天然水体沉积物的表面特征  

SURFACE CHARACTERISTICS OF THE NATURAL SEDIMENT

作　　者：文湘华[1] 杜青[1] 李莉莉[1] 汤鸿霄[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《环境化学》1996年第2期92-106,共15页Environmental Chemistry

基　　金：国家自然科学基金资助项目

摘　　要：本文运用表面络合的模式和原理,研究了江西乐安江下游黄龙庙沉积物的表面特征.通过酸碱滴定实验求定了样品的零电点pHpzc、表面质子电荷密度σH和表面总吸附位Ns;应用图解法和FITEQL程序计算法求定了江西乐安江下游黄龙庙沉积物样品的表面固有常数;对恒定容量模式、扩散层模式和三层模式在天然水体沉积物中的应用进行了比较.研究表明,应用表面络合模式研究天然水体沉积物的表面特征是可行的,三种模式都能在一定程度上较好地吻合实验数据.The surface characteristics of the Huanglong miao sediment in the down stream of Lean river in Jiangxi province is studied according to the surface complexation approach. The point of zero charge pHpzc籺he surface charge crH and the total adsorptive sites of the sample was reached through potentiometric titration experiments. The surface intrinsic constants were obtained by both the graphical and FITEQL optimization methods. The applicability of the constant capacitance model,the diffuse layer model and the triple lay er model to the natural sediments were compared. It shows that all the three models can successfully fit the experimental data to some extent,but each model has its strengths and shortcomings.

关 键 词：表面络合模式 天然水体 沉积物 表面特征 

分 类 号：X522.02[环境科学与工程—环境工程] X132