In:
Applied Spectroscopy, SAGE Publications, Vol. 69, No. 10 ( 2015-10), p. 1210-1214
Abstract:
The chemical state of thermochemically treated chromium(III) oxide (Cr 2 O 3 ) with various carbonates was analyzed by far-infrared (far-IR) spectroscopy (spectral region 700–25 cm −1 ). Non-toxic Cr 2 O 3 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 Cr 2 O 3 with magnesium carbonate lead to the formation of the Cr(III) compound MgCr 2 O 4 . 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 inorganic powders.
Type of Medium:
Online Resource
ISSN:
0003-7028
,
1943-3530
Language:
English
Publisher:
SAGE Publications
Publication Date:
2015
detail.hit.zdb_id:
1474251-2
SSG:
11
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