Effect of Ionic Strength on Specific Adsorption of Ions by Variable Charge Soils:Ezperimental Testification on the Adsorption Model of Bowden et al.
The intersection of adsorption-pH curves for phosphate and arsenate by variable charge soils were observed at different ionic strengths (a characteristic pH). Above this pH, the adsorption of the two anions increased with increasing ionic strength, whereas below it the reverse trend occurred. Under the acidic conditions, Cu(II) adsorption by goethite and γ-Al2O3 also increased with the increasing ionic strength. The change of the adsorption plane potential on variable-charge soils and Fe/Al oxides with ionic strength was responsible for the variation of specific adsorption of the anions and Cu(II). The zeta potential of soil colloids and Fe/Al oxides changed with ionic strength as an opposite trend to their surface charges. This gave an experimental proof to support the interpretation.
Variable-charge soils Specific adsorption Ionic strength Diffuse double layers Zeta potential
Renkou Xu Jun Jiang Cheng Cheng
State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,P.O.Box 821,Nanjing,China
国际会议
杭州
英文
78-80
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）