Interaction Between Charge Characteristics and Cu~2+ Adsorption-Desorption of Soils with Variable Or Permanent Charge

摘要

Charge characteristics and Cu~2+ adsorption-desorption of soils with variable charge (latosol) and per- manent charge (brown soil) and the relationship between them were studied by means of back-titration and adsorptione quilbrium 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 Cu~2+ ions sorbed by permanent-charge soil was more than that by variable-charge soil and increased with the increase of Cu~2+ concentration within a certain range in the equilibrium solution.