作　　者： ; ; ;

机构地区： 北京大学城市与环境学院地表过程分析与模拟教育部重点实验室

出　　处： 《农业环境科学学报》 2003年第6期697-699,共3页

摘　　要： 采用室内试验方法,对贵州遵义地区红土吸附和解吸砷的动力学特征进行了研究。从动力学的角度上,氧化铁对砷的吸附、解吸是一个快速反应过程。试验结果表明,60%的砷的吸附和解吸是在15min内完成的,80%是在2h内完成的,24h被认为是反应的平衡时间。扩散系数Di反映了土壤表面吸附趋势。吸附反应开始时扩散系数Di较大,随着时间延长,Di逐渐减小,吸附量趋于平稳。用Elovice方程拟合吸附数据与实验数据吻合较好。 The kinetics of adsorption and desorption of arsenic in red soil in Zunyi Area, Guizhou Province was studied. From kinetic point of view, both adsorption and desorption of arsenic were a fast process. We found in the present study that more than 60% of the adsorption and desorption of arsenic took place within 15 min. and equilibrium was reached in 24 h. The changes of diffuse coefficient could be used to explain adsorption trend in red soil surface. At beginning of the reaction, diffuse coefficient Di was large, thus it decreased with the going of reaction, and reached equilibrium gradually. The adsorption processes could be simulated by the Elovice equation.

关 键 词： 砷 贵州 红土 表面吸附力 解吸动力学 扩散系数

领　　域： [环境科学与工程]