Eh-pH diagrams are essential tools in geochemistry, metallurgy, and chemical engineering. They have been used since the late 1950s and have become popular in addressing issues related to radioactive and hazardous waste disposal. However, many existing diagrams are outdated or incomplete, and some do not account for dissolved sulfur and carbon dioxide species. This book provides updated Eh-pH diagrams for 75 chemical elements, including those with multiple valences and those sensitive to sulfide-sulfate redox conditions. The diagrams are constructed under standard conditions of 25°C and 1 bar pressure. The book also includes a brief explanation for each element, highlighting their importance in hazardous waste disposal. The thermodynamic data used in the book is a mix of older, less precise data and more recent, high-quality data, which may lead to revisions as more accurate data becomes available. The goal of the book is to provide a comprehensive reference for Eh-pH diagrams, allowing readers to understand the role of redox reactions in nature and compare mineral assemblages and aqueous species in Eh-pH space. The book also includes acknowledgments of the contributions of previous researchers and the support received from various institutions. The contents cover a wide range of elements, including iodine, sulfur, nitrogen, phosphorus, arsenic, carbon, silicon, boron, aluminum, gallium, indium, thallium, zinc, cadmium, mercury, copper, silver, gold, nickel, cobalt, iron, palladium, rhodium, ruthenium, platinum, iridium, osmium, manganese, technetium, rhenium, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, scandium, yttrium, and rare earth elements. The book also includes references and a subject index.Eh-pH diagrams are essential tools in geochemistry, metallurgy, and chemical engineering. They have been used since the late 1950s and have become popular in addressing issues related to radioactive and hazardous waste disposal. However, many existing diagrams are outdated or incomplete, and some do not account for dissolved sulfur and carbon dioxide species. This book provides updated Eh-pH diagrams for 75 chemical elements, including those with multiple valences and those sensitive to sulfide-sulfate redox conditions. The diagrams are constructed under standard conditions of 25°C and 1 bar pressure. The book also includes a brief explanation for each element, highlighting their importance in hazardous waste disposal. The thermodynamic data used in the book is a mix of older, less precise data and more recent, high-quality data, which may lead to revisions as more accurate data becomes available. The goal of the book is to provide a comprehensive reference for Eh-pH diagrams, allowing readers to understand the role of redox reactions in nature and compare mineral assemblages and aqueous species in Eh-pH space. The book also includes acknowledgments of the contributions of previous researchers and the support received from various institutions. The contents cover a wide range of elements, including iodine, sulfur, nitrogen, phosphorus, arsenic, carbon, silicon, boron, aluminum, gallium, indium, thallium, zinc, cadmium, mercury, copper, silver, gold, nickel, cobalt, iron, palladium, rhodium, ruthenium, platinum, iridium, osmium, manganese, technetium, rhenium, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, scandium, yttrium, and rare earth elements. The book also includes references and a subject index.