Chemical study of passivating chromium oxide films by soft X-ray absorption spectroscopy

The Analyst ◽  
1994 ◽  
Vol 119 (4) ◽  
pp. 609 ◽  
Author(s):  
M. O. Figueiredo ◽  
A. Correia dos Santos ◽  
M. J. Carmezim ◽  
M. Abbate ◽  
F. M. F. de Groot ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Chromium Oxide ◽  
Oxide Films ◽  
Chemical Study ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Use of micro X-ray absorption spectroscopy and diffraction to delineate Cr(VI) speciation in COPR

2013 ◽  
Vol 11 (3) ◽  
pp. 318-324
Keyword(s):  
Light Source ◽  
Absorption Spectroscopy ◽  
Chromium Oxide ◽  
X Ray ◽  
Ore Processing ◽  
Advanced Light Source ◽  
The Matrix ◽  
Elemental Maps ◽  
X Ray Absorption

The speciation of Cr(VI) in Cromite Ore Processing Residue was investigated by means of bulk XRD, and a combination of micro-XRF, - XAS and –XRD at the Advanced Light Source (ALS), Berkeley, CA, U.S.A.. Bulk XRD yielded one group of phases that contained explicitly Cr(VI) in their structure, Calcium Aluminum Chromium Oxide Hydrates, accounting for 60% of the total Cr(VI). Micro-analyses at ALS yielded complimentary information, confirming that hydrogarnets and hydrotalcites, two mineral groups that can host Cr(VI) in their structure by substitution, were indeed Cr(VI) sinks. Chromatite (CaCrO4) was also identified by micro- XRD, which was not possible with bulk methods due to its low content. The acquisition of micro-XRF elemental maps enabled not only the identification of Cr(VI)-binding phases, but also the understanding of their location within the matrix. This information is invaluable when designing Cr(VI) treatment, to optimize release and availability for reduction.

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