Summary
A phase diagram of an aqueous iron-sulfur system constructed from thermodynamic data for initial concentrations of 100 ppm H2S and 100 ppm Fe permitted us to predict that the principal precipitate found in the Eh - pH range of flooded Louisiana rice paddys would be FeS2. Analysis of precipitates formed in the laboratory at Eh and pH levels simulating paddy conditions showed that both FeS2 and FeS were present; however more FeS than predicted was actually precipitated in the FeS2 field of dominance.
A multiparameter diagram for an aqueous system was constructed relating equilibrium iron concentration, Eh, pH and the equilibrium H2S concentration (that H2S which is in equilibrium with precipitated sulfides). It was demonstrated from the diagram and associated thermodynamic equations that the H2S⇌FeS2 equilibrium predicts theoritical values of H2S in agreement with experimental values of H2S from rice paddy soil samples8.
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Pitts, G., Allam, A.I. & Hollis, J.P. Aqueous iron-sulfur systems in rice field soils of Louisiana. Plant Soil 36, 251–260 (1972). https://doi.org/10.1007/BF01373480
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DOI: https://doi.org/10.1007/BF01373480