The chemical state of thermochemically treated chromium(III) oxide
(Cr2O3) with various carbonates was analyzed by
far-infrared (far-IR) spectroscopy (spectral region 700-25 cm−1).
Non-toxic Cr2O3 was oxidized with potassium, sodium, and
calcium carbonate, respectively, to toxic Cr(VI) and Cr(V) compounds during thermal
treatment at 1000 °C. In reverse, thermochemical treatment of
Cr2O3 with magnesium carbonate lead to the formation of
the Cr(III) compound MgCr2O4. Higher temperatures (>1200
°C) or reducing atmospheric conditions prevent the formation of Cr(VI)/Cr(V)
compounds, too. Additionally, it was found that polyethylene powder with a low
particle size (<70 μm) is favorable for the collection of good far-IR spectra of
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