This open &#64257;le report aims to present an intercomparison of thermodynamic databases by means of Eh-pH diagrams, which are practical and useful for understanding geochemical behavior of elements. An Eh-pH diagram depicts the dominant aqueous species and stable solid phases on a plane de&#64257;ned by the Eh and pH axes. In an Eh-pH diagram, the solid stability area is related to the saturation condition,and dominant aqueous species give us fundamental information on sorption and colloid phenomena as well as surface characteristics of materials. Eh-pH diagrams are thus essential to understanding solute and radionuclide transport in groundwater. The most well-known studies on comprehensive Eh-pH diagrams are those of Pourbaix (1966) and Brookins (1988). The former discussed corrosion, passivation and immunity of materials, while the latter reported geochemical aspects of the geological disposal of radioactive wastes. These studies have been followed by many thermodynamic databases. With the ever increasing CPU power of computers, we have started utilizing geochemical codes for calculation of complex chemical reactions. Thus, thermodynamic databases have gained importance from a practical perspective.

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