Oxidation of Mn(II): Initial mineralogy, oxidation state and ageing

Details Oxidation of Mn(II): Initial mineralogy, oxidation state and ageing Oxidation of Mn(II): Initial mineralogy, oxidation state and ageing

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..463m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 2, pp.463-470

Computer Science

10

Scientific paper

The initial solid phase oxidation products formed during the oxidation of aqueous Mn(II) at 25°C were studied as a function of time. The analyses included morphology (TEM), mineralogy (x-ray diffraction), O / Mn ratio (iodometric method), oxidation state of manganese (XPS), and dissolved manganese. The initial solid formed under our conditions was Mn 3 O 4 (hausmannite) which converted completely to MnOOH (manganite) after eight months. MnOOH (feitknechtite) appeared to be an intermediate in this transformation. The O / Mn ratio was initially 1.37 and increased to 1.49 over the same time span. Throughout the course of this study the XPS analyses showed that the surface of the solids (<50 Å) was dominated by Mn(III). The solution pH and dissolved manganese concentrations were consistent with disproportionation and oxidation reactions that favor the transformation of Mn 3 O 4 to MnOOH but not to MnO 2 .

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