酸雨胁迫下水稻土对镉的静态吸附行为研究  

STUDY ON STATIC ADSORPTION OF CADMIUM IN PADDY SOIL UNDER ACID RAIN CONDITION

作　　者：张伟[1] 黄艺[1] 陈莹[1] 李国臣[1] 袁为[1] 任静[1] 

机构地区：[1]成都理工大学地球化学系,四川成都610059

出　　处：《矿物岩石》2013年第3期116-120,共5页Mineralogy and Petrology

基　　金：国家自然科学基金(No.41273124);四川省教育厅重点科研项目(No.KZT011)

摘　　要：采用人工模拟酸雨,配制含主要阴、阳离子及一定范围pH值的母液,以成都市近郊典型农业土壤水稻土为研究对象,开展自然条件下土壤对镉的静态吸附研究;揭示了水稻土对镉的吸附特征,确定了酸雨中影响土壤对镉吸附的关键因素及影响程度,建立了土壤对镉的等温吸附曲线;通过平衡模型对等温吸附曲线进行拟合,在实验设定的浓度范围内,Freundlich模型和Henry模型均具有较好的拟合性,相关指数显著,适合描述镉在供试土壤中的吸附过程。In order to study the static adsorption of cadmium in the soil under the natural condi- tions,typical paddy soils in Chengdu area were sampled and simulated acid rain solutions contai- ning mainly anions and cations with various pH values were prepared. Study and analysis revealed the adsorption characteristics of cadmium in the paddy soil, determined the key factors affecting adsorption behaviors of cadmium in the soil under acid rain. The sorption isotherm of cadmium in soil was established and fitted to the balance model in the concentration range of the experimental setting. It was showed that the Freundlich and Henry models had a better underlying index, and the two models can be used to describe the adsorption process of cadmium in the test soil.

关 键 词：酸雨 镉 水稻土 吸附 平衡模型 

分 类 号：S153[农业科学—土壤学]