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  • 1 Department of Inorganic and Analytical Chemistry and Radiochemical Laboratory of the L. Eötvös University Budapest (Hungary)
  • 2 G. Richter Pharmaceutical Works Budapest (Hungary)
  • 3 Department of Inorganic and Analytical Chemistry of the A. József University P.O.Box 440 H-6701 Szeged (Hungary)
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Iron injections containing high spin iron(III) complexes may undergo a reductive decomposition during preparation or storage. This process was investigated by the Mössbauer spectroscopy of ice samples prepared by quick-freezing of the injection. The comparison of three model compounds and the correlation between the osmotic pressure of the solutions and their iron(II) concentration formed in the decomposition process and determined by Mössbauer measurements revealed the reason and mechanism of the decomposition.