Part I: Foundations Introduction Colloidal Particles and Colloidal Suspensions Electrified Interface Sorption onto Colloidal Particles Surface Charge of Colloidal Particles Interparticle Interactions and Colloid Stability Part II: Soil Components Soil Composition and Characterization Silicate-Based Minerals Oxide Minerals Humic Substances Part III: Ion Binding to Soil Colloids Modeling Ion Binding: General Concepts Ion Binding to Minerals: Discrete Site Modeling Ion Binding to Humic Substances: Distributed Site Modeling Ion Binding to Soils Index