Hydrothermal precipitation from aqueous solutions containing iron(III), arsenate and sulphate

The relative order of stability of the compounds synthesised at elevated temperatures is: Type-2 003D; Scorodite > Arsenical Ferrihydrite > Type-1

P. M. Swash

2011

Scholarcy highlights

  • The relative order of stability of the compounds synthesised at elevated temperatures is: Type-2 003D; Scorodite > Arsenical Ferrihydrite > Type-1
  • A systematic programme of synthesis, characterisation and solubility testing of solids precipitated from solutions containing various ratios of Fe3+, ASO43- and SO42- has enabled the relative stabilities of the various arsenical phases to be assessed empirically
  • Over 90% of the arsenic can be precipitated from solutions of pH2(HAsO4)3-zH2O) and Type-23(OH)x(SO4)y)
  • When a comparison is made of the stability of these high temperature crystalline solids with amorphous iron arsenates precipitated at ambient temperature and at pH 5, the crystalline solids are marginally less stable
  • Proceedings of the Randol Forum, Cairns 1, 77–98Google Scholar

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