Introduction: Scope of Aquatic Chemistry, The Solvent Water, Solute Species; Chemical Thermodynamics and Kinetics; Acids and Bases; Dissolved Carbon Dioxide; Atmosphere-Water Interaction; Metal Ions in Aqueous Solution: Aspects of Coordination Chemistry; Precipitation and Dissolution; Oxidation and reduction, equilibria and microbial mediation; The Solid–Solution Interface; Trace Metals: Cycling, Regulation, and Biological Role; Kinetics of Redox Processes; Photochemical Processes; Kinetics at the solid-water interface: Adsorption, dissolution of minerals, nucleation, and crystal growth; Particle-particle interaction: coloids coagulation, and filtration; Regulation of the chemical composition of Natural Waters