Technical ArticleInteraction of Electrical Double Layers Between Oppositely Charge Particles in Variable-Charge Soils as Related to Source to Salt AdsorptionLi, Su-zhen1,2; Xu, Ren-kou1; Li, Jiu-yu1,2Author Information 1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing, China. Dr. Xu is corresponding author. Email: [email protected] 2Graduate University of Chinese Academy of Sciences, Beijing, China. Received Aug. 25, 2008 and in revised form Nov. 3, 2008. Accepted for publication November 6, 2008. The correct title for this article should be: Interaction of electrical double layers between oppositely charged particles in variable charge soils as related to salt adsorption. The journal apologizes for this mistake. Soil Science: January 2009 - Volume 174 - Issue 1 - p 27-34 doi: 10.1097/SS.0b013e3181945463 Buy Metrics Abstract The interaction of electrical double layers between oppositely charged particles of variable-charge soils collected from southern China was investigated by means of column leaching experiments. The results showed that cations and anions of indifferent electrolytes such as NaCl and NaNO3 were simultaneously adsorbed by some of the soils during leaching experiments. The number of the ions released was shown to be less than the number of the ions adsorbed. This probably led to the decrease in the electrical conductivity (EC) of the leachate at the initial stage of the leaching experiments. When the soil with adsorbed salt was washed with distilled water, both cations and anions adsorbed were immediately removed from the soil particle surfaces. This phenomenon is attributed to the overlapping of the diffuse layers of the electrical double layers between positively charged iron (Fe)/aluminum (Al) oxides and negatively charged phyllosilicates of the variable-charge soils. The extent of interaction between oppositely charged particles was shown to be directly related to the EC and the content of free Fe/Al oxides in the soils. The lower soil EC and higher content of soil free Fe/Al oxides appeared to cause a stronger interaction between oppositely charged particles. © 2009 Lippincott Williams & Wilkins, Inc.