Pedosphere 12(4): 321--328, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Interaction between charge characteristics and Cu2+ adsorption-desorption of soils with variable or permanent charge |
| LI Xue-Yuan, LING Wan-Ting and HE Ji-Zheng |
| Key Laboratory of Subtropical Soil Resources and Environment, Chinese Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070 (China) |
| ABSTRACT |
| Charge characteristics and Cu2+ adsorption-desorption of soils with variable charge (latosol) and permanent charge (brown soil) and the relationship between them were studied by means of back-titration and adsorption equilibrium respectively. The amount of variable negative charge was much less in variable-charge soil than in permanent-charge soil and increased with the pH in the system, but the opposite trend occurred in the points of zero charge (PZCs). The amount of Cu2+ ions sorbed by permanent-charge soil was more than that by variable-charge soil and increased with the increase of Cu2+ concentration within a certain range in the equilibrium solution. The amount of Cu2+ ions desorbed with KCl from permanent-charge soil was more than that from variable-charge soil, but the amount of Cu2+ ions desorbed with de-ionized water from permanent-charge soil was extremely low whereas there was still a certain amount of desorption from variable-charge soil. The increase of PZC of soils with variable or permanent charge varied with the increment of Cu2+ ions added. When the same amount of Cu2+ ions was added, the increments of PZC and variable negative surface charge of permanent-charge soil were different from those of variable-charge soil. |
| Key Words: adsorption-desorption, Cu2+ ion, permanent-charge soil, variable-charge soil, variable negat surface charge |
| Citation: Li, X. Y., Ling, W. T. and He, J. Z. 2002. Interaction between charge characteristics and Cu2+ adsorption-desorption of soils with variable or permanent charge. Pedosphere. 12(4): 321-328. |
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