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Updated: Aug 23, 2026

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
Published on: February 15, 2019
Predominance and mineral stability diagrams revisited
David G Kinniburgh1, David M Cooper
1British Geological Survey and Centre for Ecology and Hydrology, Wallingford, Oxon, U.K. dgk@bgs.ac.uk
Abstract:
Predominance and mineral stability diagrams are most useful if they are based on a full chemical speciation. The diagrams can then include a wide range of reactions of importance in environmental chemistry including adsorption and ion exchange reactions. They can also take into account the possible interactions between a large number of components and are able to model changes at a fixed total concentration of each component rather than under the commonly used but less realistic assumption of a fixed activity. A "hunt-and-track" algorithm is described that enables predominance and mineral stability diagrams to be constructed using any general-purpose speciation program. Examples are given using PHREEQC and Orchestra.
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