Pedosphere 4(2): 153--164, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Adsorption Kineties of Pb(2+) and Cu(2+) on Variable Charge Soils andMinerals V .Effects of Temperature and Ionic Strength |
| HU GUO-SONG1 |
| Institute of Soil Science, Academia Sinica, P. O . Box 821 . Nanjing 210008 (China) |
| ABSTRACT |
| The study results of the effects of temperature and ionic strength on the adsorption kinetics of Pb2+ and Cu2+ by latosol, red soil and kaolinite coated with Mn oxide showed that Pbr" and Cur" adsorption by all samples, as a whole, increased with raising temperature. Temperature also increased both values of Xm (the amount of ion adsorbed at equilibrium) and k (kinetics constant) of Pb2+ and Cu2+ The activation energies of Pb2+ adsorption were kaolin-Mn>red soil>goethite and those of Cu2+ were latosol>red soil>kaolin-Mn>goethite. For a given single sample the activation energy of Cu2+ was greater than that of Pb2+. Raising ionic strength decreased the adsorption of Pb2+ and Cu2+ by latosol, red soil and kaolinite coated with Mn oxide but increased Pb2+ and Cu2+ adsorption by goethite. The contrary results could be explained by the different changes in ion forms of Pb2+ or Cu2+ and in surface charge characteristics of latosol, red soil, kaolin-Mn and goethite. Increasiclg supporting electrolyte concentration in-creased Xm and k in goethite systems but decreased and k in kaolin-Mn systems. All the timedependent data fitted the surface secondorder equation very well.] |
| Key Words: |
| Citation: Hu, G. S. 1994. Adsorption Kineties of Pb(2+) and Cu(2+) on Variable Charge Soils andMinerals V .Effects of Temperature and Ionic Strength. Pedosphere. 4(2): 153-164. |
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