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Preparation and Eh--pH diagrams of Fe(II)--Fe(III) green rust compounds; hyperfine interaction characteristics and stoichiometry of hydroxy-chloride, -sulphate and -carbonate

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Abstract

Fe(II)--Fe(III) hydroxy-chloride, -sulphate and -carbonate were prepared by oxidation of a ferrous hydroxide precipitate in anion-containing aqueous solutions. The compounds are characterized by monitoring the redox potential Eh and the pH of stochiometric suspension vs time with the appropriate concentration ratios. X-ray diffraction allows us to characterize the crystal structure by distinguishing “green rust one” (GR1) from “green rust two” (GR2). Since green rusts (GRs) are of a pyroaurite-sjögrenite-like structure, i.e., consisting of intercalated foreign anions and water molecules in the interlayers between the brucite-like layers of Fe(OH)2, their chemical formulae can be determined from the Mössbauer spectra. Three quadrupole doublets are observed: D1 and D2 correspond to a ferrous state with isomershift IS of about 1.27 mm s-1 and quadrupole splittings QS of about 2.85 and 2.60 mm s-1, respectively, whereas D3 corresponds to a ferric state with IS and QS of about 0.4 mm s-1. The hyperfine parameters of these doublets are similar from one green rust to another but their intensity ratios vary considerably. Finally, Eh and pH equilibrium diagrams of the Fe species in the presence of chloride, sulphate and carbonate anions contained within the water solution are drawn and the thermodynamic conditions of existence and degrees of oxidation of green rusts are discussed.

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References

  1. J.D. Bernal, D.R. Dasgupta and A.L. Mackay, Clay Min. Bull. 4 (1959) 15–30.

    Google Scholar 

  2. L. Ingram and H.F.W. Taylor, Min. Mag. 36 (1967) 465–479.

    Google Scholar 

  3. R. Allmann, Acta Cryst. B 24 (1968) 972–977.

    Google Scholar 

  4. P.P. Stampfl, Corr. Sci. 9 (1969) 185–187.

    Article  Google Scholar 

  5. J.-M.R. Génin, N. Benbouzid-Rollet, D. Prieur, M. Confente and B. Résiak, Hyp. Interact. 69 (1991) 875–878.

    Article  Google Scholar 

  6. C.B. Koch and S. Mørup, Clay Min. 26 (1991) 577–582.

    Google Scholar 

  7. M. Abdelmoula, F. Trolard, G. Bourrié and J.-M.R. Génin: Evidence of the Fe(II)-Fe(III) green rust “fougerite” mineral occurrence in a hydromorphic soil and its transformation with depth. These Proceedings.

  8. A.A. Olowe and J.-M.R. Génin, Corr. Sci. 32 (1991) 965–984.

    Article  Google Scholar 

  9. Ph. Refait and J.-M.R. Génin, Corr. Sci. 34 (1993) 797–819.

    Article  Google Scholar 

  10. H. Drissi, Ph. Refait and J.-M.R. Génin, Hyp. Interact. 90 (1994) 395–400.

    Article  Google Scholar 

  11. J.-M.R. Génin, A.A. Olowe, Ph. Refait and L. Simon, Corr. Sci. 38 (1996) 1–12.

    Article  Google Scholar 

  12. S. Miyata, Clays Clay Miner. 31 (1983) 305–311.

    Google Scholar 

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Génin, JM., Refait, P., Simon, L. et al. Preparation and Eh--pH diagrams of Fe(II)--Fe(III) green rust compounds; hyperfine interaction characteristics and stoichiometry of hydroxy-chloride, -sulphate and -carbonate. Hyperfine Interactions 111, 313–318 (1998). https://doi.org/10.1023/A:1012638724990

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