Abstract
The occurrence of a new carbonate green rust (GR) obtained by electrochemical oxidation of iron in bicarbonate/carbonate solutions has been evidenced by infrared spectroscopy, Raman microprobe and coulometric titration. The Fe 2+/Fe 3+ ratio is 1 that corresponds to an iron oxidation state of 2.5. Under wet and dry aerial oxidation conditions, the 1/1 carbonate GR is significantly more stable than the 2/1 carbonate GR, reported in the literature by now. The ultimate oxidation product is ferrihydrite. From coulometric investigations, the mechanism of formation was found to involve both an oxidation of iron to Fe(II) complexes and a solution oxidation of Fe(II) to Fe(III) prior to the precipitation of 1/1 carbonate GR.
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