摘要
应用放射性核素1 4 1 Ce ,采用一次平衡法 (batch)研究铈 (Ⅲ )在四种典型土壤 (红壤 ,潮土 ,黄土和黑土 )上的吸附和解吸的动力学 ,发现低量的Ce(Ⅲ )在四种土壤被吸附的很快 ,在 0 5min内接近完全吸附 ;在四种土壤上的解吸过程大约在 1—30min内接近完成 ;不同土壤达到解吸平衡所需的时间及同一时间的解吸量亦不相同 ,Ce(Ⅲ )在四种土壤上解吸的最优模型是 :潮土和黑土是Elovich方程 (S =A +Blnt) ;红壤和黄土的最优模型是抛物线扩散方程 (S/Smax=A +Bt.Ce(Ⅲ )在四种土壤上解吸是扩散控制的过程 .
The kinetics of Ce(Ⅲ) adsorption\|desorption for four typical soils in China was studied by the batch method with the radioactive nuclide 141 Ce.Results indicated that low content Ce(Ⅲ) is adsorbed very fast by four type soils,which almost completed within 0.5 minute.The desorption procedure is nearly finished in 1—30 minute in the studied soils.Ce(Ⅲ) desorbing equilibrium time in different soils is not same.The Ce(Ⅲ) desorbing amount of different soils in the same time is not same yet.The Elovich equation was the best models for fitting to the data of Ce(Ⅲ) desorbing reactions in Chao soil and black soil;and the parabolic\|diffusion equation is the best model in red soil and yellow soil.
出处
《环境科学学报》
CAS
CSCD
北大核心
2000年第5期548-553,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金!重大项目 ( 2 9890 2 80 1 ( 1 ) )资助
关键词
吠附
解吸
动力学
铈
土壤评价
Ce(Ⅲ)
soils
adsorption\|desorption
kinetics
