The extensive database utilizes the well-known revised Helgeson-Kirkham-Flowers (HKF) equations for aqueous species. ![]() It uses the graphical capabilities of R to produce high-quality chemical activity diagrams for aqueous species and predominance diagrams including Eh-pH (Pourbaix) and log f O 2 - T diagrams. The package provides an integrated set of functions to calculate the standard molal thermodynamic properties and chemical affinities of reactions. CHNOSZ is a free package for R that has been frequently updated since its first release in 2008. Accessible and up-to-date software and databases are important for the development and reproducible application of thermodynamic models. Thermodynamics provides a framework for the quantitative description and prediction of the solubilities and relative stabilities of different minerals, metal transport in hydrothermal fluids, and geobiochemical reactions that drive microbial metabolism and contribute to the compositional variation of proteins. ![]() Thermodynamic calculations are an essential tool for many areas of geochemistry. 2School of Geosciences and Info-Physics, Central South University, Changsha, China.1Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha, China.
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