This course will cover selected aspects of the chemistry of aquatic systems. Lectures cover basic principles of physical-organic chemistry relevant to the aquatic environment under realistic conditions. Specific topics covered in this course include the basic principles of equilibrium chemical and physical processes important for natural waters. Topics include: chemical potential, fugacity, phase transfer, acid-base chemistry, metal-ligand substitution chemistry, surface chemistry, octanol-water partitioning, air-water partitioning, partitioning to solid organic matter and biomedia, sorption processes, air-water exchange dynamics, and the kinetics and mechanisms of coupled organic and inorganic redox reactions. Thermodynamics, transport, phase transfer and kinetics are emphasized.