Publication Date:
2011-07-01
Description:
In soil near tailings from an antimony (Sb) mine, we found micro-grains coated with an antimony-rich layer. These grains were characterized in detail using multiple advanced analytical techniques such as micro-X-ray absorption near edge structure ({micro}-XANES), micro-extended X-ray absorption fine structure ({micro}-EXAFS), micro-X-ray diffraction ({micro}-XRD), transmission electron microscope (TEM), and electron probe microanalysis (EPMA). The EPMA showed that one soil grain (grain A) locally accumulated a large amount of Sb in the secondary phases (40-61 wt% Sb2O5) with significant Fe (20-28 wt% Fe2O3). The spatial distribution of Sb in the grain was similar to that of iron. Both Fe {micro}-XANES and {micro}-XRD of the Sb hot spots in grain A consistently showed that the secondary products were dominantly composed of ferric antimonate, tripuhyite (FeSbO4). Fits to the Sb K-edge {micro}-EXAFS of this phase showed second-neighbor coordination numbers ~30% smaller than in bulk tripuhyite, indicating that the tripuhyite included in grain A is nanoparticulate and/or has a high structural disorder. The TEM analysis suggests that the particle size of tripuhyite in grain A was around 10 nm, which is consistent with the size range indicated by {micro}-XRD and {micro}-EXAFS. This is the first report showing tripuhyite with nanocrystallinity in natural soil to date.
Print ISSN:
0003-004X
Electronic ISSN:
1945-3027
Topics:
Geosciences
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