酸雨条件下成都平原黄壤镉的等温吸附模型研究

采用人工模拟酸雨方法,配制含主要阴、阳离子及一定范围pH值的母液,选取成都市近郊典型农业土壤黄壤,研究黄壤在自然条件下镉的静态吸附;探究黄壤对镉的吸附特征,确定酸雨中影响黄壤镉吸附行为的关键因素及影响程度,建立黄壤对镉的等温吸附曲线,讨论酸雨条件下影响黄壤镉分配系数的关键因素;采用Henry模型拟合等温吸附曲线。结果表明,在实验设定的浓度范围内,该模型相关系数均达显著,能较好地描述镉在黄壤中的吸附过程。

The study on Cadmium isothermal adsorption in yellow soil under acid rain condition

The typical yellow soils in Chengdu area were sampled for this research. For carrying out the study of static adsorp tion of Cadmium in the yellow soil urlder the natural conditions, the simulated acid rain solutions containing mainly anions and cations with various pH values were prepared. The results revealed the adsorption characteristics of Cadmium in yellow soil, and determined the key factors that affected adsorption behaviors of Cadmium in the yellow soil under the acid rain. The sorp tion isotherm of Cadmium in yellow soil was established and fitted to the balance model in the concentration range of the experi mental setting. The results showed that Henry model had a better underlying index and it can be used to describe the adsorp tion process of cadmium in the yellow soil.