This book, "Eh-pH Diagrams for Geochemistry" by Dr. Douglas G. Brookins, provides a comprehensive resource on Eh-pH diagrams, which have been used in geochemistry, metallurgy, and chemical engineering since the late 1950s. The author aims to address the limitations of existing diagrams, such as outdated data and incomplete coverage of chemical elements, by creating generic Eh-pH diagrams for 75 elements, excluding only the alkali elements, noble gases, and a few radioactive elements due to insufficient thermodynamic data. The diagrams cover elements with multiple valences and those sensitive to sulfide-sulfate redox conditions, and include stability fields of solids and aqueous species. The book also includes brief texts explaining the diagrams and their significance in hazardous waste disposal. The diagrams are constructed under 25°C and 1 bar conditions, with plans for future projects to extend to higher temperatures and pressures. The book is intended to help readers understand the role of redox reactions in nature and compare various mineral assemblages and aqueous species in Eh-pH space.This book, "Eh-pH Diagrams for Geochemistry" by Dr. Douglas G. Brookins, provides a comprehensive resource on Eh-pH diagrams, which have been used in geochemistry, metallurgy, and chemical engineering since the late 1950s. The author aims to address the limitations of existing diagrams, such as outdated data and incomplete coverage of chemical elements, by creating generic Eh-pH diagrams for 75 elements, excluding only the alkali elements, noble gases, and a few radioactive elements due to insufficient thermodynamic data. The diagrams cover elements with multiple valences and those sensitive to sulfide-sulfate redox conditions, and include stability fields of solids and aqueous species. The book also includes brief texts explaining the diagrams and their significance in hazardous waste disposal. The diagrams are constructed under 25°C and 1 bar conditions, with plans for future projects to extend to higher temperatures and pressures. The book is intended to help readers understand the role of redox reactions in nature and compare various mineral assemblages and aqueous species in Eh-pH space.