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Workshop Lectures The Clay Minerals Society Volume 6 Table of Contents Volume 6, 1994, Layer Charge Characteristics of 2:1 Silicate Clay Minerals A. R. Mermut, Editor Layer Charge Determination by Alkylammonium Ions…………………G. Lagaly Introduction Materials and Methods Results Interlamellar Arrangement of Alkylammonium Ions Layer Charge Determination Smectites Corrections Vermiculites Micas Mixed-Layer Minerals Applications Identification of Smectites and Vermiculites High Performance Characterization of Smectites and Vermiculites Montmorillonite Content of Bentonites Cations at the Edges HRTEM Techniques Summary References Cited Role of Layer Charge in Organic Contaminant Sorption by Organo-Clays………………………………………S.A. Boyd and W.F. Jaynes Introduction Organophillic Clays Adsorptive Clays Role of Layer Charge Organiphilic Clays Adsorptive Clays Acknowledgements References Cited Evaluation of Structural Formula and Alkylammonium Methods of Determining Layer Charge…………………………………D.A. Laird Introduction The Structural Formula Method Structural Formula Calculations Layer Charge Estimates From Structural Formulae Sample Contamination Effects Alkylammonium Method Layer Charge Calculations Layer Charge Heterogeneity - Traditional Interpretation Layer Charge Heterogeneity - Alternative Interpretation The Particle Size Effect Identification of Vermiculite Comparison Of Layer Charge Values Determined By The Structural Formula And Alkylammonium Methods Summary References Cited Problems Associated with Layer Charge Characterization of 2:1 Phyllosilicates…………………………………………………A.R. Mermut Introduction Determination of Layer Charge in High Charge Phyllosilicates Charge Distribution Between Tetrahedral and Octahedral Sheet by Li-Saturation Calculation of the Average Charge by Nitrogen Determination Correction of the Peak Positions of Alkylammonium Saturated Clays References Cited The Movement of Neutral Particles in Charged Media ............................ J. Farmer Introduction Particulate Generation and Removal Processes Particle Generation Particle Removal Multicomponent Aqueous Phase Chemistry of Carrier Mechanism Competitive Interactions of Solutes and Montmorillonite Retention of Ethylene Dibromide by Clay Minerals References Cited