Abstract
The kinetics of formation of green rust 2, 4Fe(OH)2.2FeOOH.FeSO4.nH2O, called “GR2, was followed by Mössbauer spectroscopy in the controlled aeration of a mixture of 0.4 M FeSO4 and 0.4 M NaOH. Mössbauer spectra run at 78 K of the reaction products taken at different time intervals display an average of seven doublets. The initial products of reaction consists of a badly crystallized ferrous hydroxide, FE(OH)2., called “FH”, which disappears first at about 1/3 of the total time of formation of GR2, and sulphated ferrous hydroxide, 4Fe(OH)2.FeSO4.nH2O, called “SFH”. The kinetics of oxidation of SFH into GR2 can be described by a linear growth reaction and the transformation is considered to be in situ.
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Olowe, A.A., Genin, J.M.R. Kinetics of formation of green rust 2 in the steady acidic sulphated medium. Hyperfine Interact 57, 2029–2035 (1990). https://doi.org/10.1007/BF02405760
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DOI: https://doi.org/10.1007/BF02405760