摘要
华南地区３种不同母质发育的酸性红壤汞吸附结果分别用Ｌａｎｇｍｕｉｒ、Ｆｒｅｕｎｄｌｉｃｈ、Ｔｅｍｋｉｎ３个等温吸附方程拟合，其中Ｆｒｅｕｎｄｌｉｃｈ方程拟合效果较好．从试验结果计算得到各方程组成的参数项数值都能较好地反映土壤的吸附特性．供试土壤对汞吸附速度差异很大，汞吸附反应结果表明符合化学反应一级动力学方程式Ｃ＝Ｃｏｅ－Ｋｔ．研究体系的温度和酸度的增加，土壤汞吸附量降低．
Mercury adsorption was conducted with Ca saturated soils and in 0 005mol/L CaCl 2 solution.The results of mercury adsorption to three types of soils developed from different parent materials were fitted to three isothermal adsorption equations, i.e., Langmuir,Freundlich,Temkin,respectively,among which Langmuir and Freundlich equation were better fitted.The constants of each equation calculated from the experimental data could indication well the characteristics of soil sadsorption.The adsorption rate varied greatly among the three types of soils. The results indicated that the kinetics of mercury adsorption could be fitted to the first order chemical kinetic equation: C=C oe -Kt . The adsorption of mercury decreased as temperature and acidity of the system increased.
出处
《华南农业大学学报》
CAS
CSCD
1996年第3期25-29,共5页
Journal of South China Agricultural University
关键词
红壤
汞
吸附
red soil
mercury
specific adsorption
