Free energy of formation for green rust sodium sulphate (NaFe6Fe3(OH)18(SO4)2(s)) |
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| Authors: | E Davesne K Dideriksen BC Christiansen KB Ayala-Luis HCB Hansen |
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| Institution: | a Nano-Science Centre, Department of Chemistry, Faculty of Sciences, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
b Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871Frederiksberg C, Denmark |
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| Abstract: | In a recent study, sulphate-bearing green rust (GRSO4) was shown to incorporate Na+ in its structure (NaFeII6FeIII3(OH)18(SO4)2(s); GRNa,SO4). The compound was synthesised by aerial oxidation of Fe(OH)2(s) in the presence of NaOH. This paper reports on its free energy of formation  .Freshly synthesised GRNa,SO4 was titrated with 0.5 M H2SO4 in an inert atmosphere at 25 °C, producing dissolved Fe2+ and magnetite or goethite. Solution concentrations, PHREEQC and the MINTEQ database were used to calculate reaction constants for the reactions: |
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