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https://hdl.handle.net/2440/85961
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Type: | Journal article |
Title: | Sb⁵⁺ and Sb³⁺ substitution in segnitite: a new sink for As and Sb in the environment and implications for acid mine drainage |
Other Titles: | Sb(5+) and Sb(3+) substitution in segnitite: a new sink for As and Sb in the environment and implications for acid mine drainage |
Author: | Mills, S. Etschmann, B. Kampf, A. Poirier, G. Newville, M. |
Citation: | American Mineralogist: an international journal of earth and planetary materials, 2014; 99(7):1355-1359 |
Publisher: | Mineralogical Society of America |
Issue Date: | 2014 |
ISSN: | 0003-004X 1945-3027 |
Statement of Responsibility: | Stuart J. Mills, Barbara Etschmann, Anthony R. Kampf, Glenn Poirier and Matthew Newville |
Abstract: | A sample of Sb-rich segnitite from the Black Pine mine, Montana, U.S.A., has been studied by microprobe analyses, single-crystal X-ray diffraction, and μ-EXAFS and XANES spectroscopy. Linear combination fitting of the spectroscopic data provided Sb5+:Sb3+ = 85(2):15(2), where Sb5+ is in octahedral coordination substituting for Fe3+ and Sb3+ is in tetrahedral coordination substituting for As5+. Based upon this Sb5+:Sb3+ ratio, the microprobe analyses yielded the empirical formula Pb1.02 H1.02(Fe3+2.36Sb5+0.41Cu2+0.27)∑3.04(As5+1.78Sb3+0.07S6+0.02)∑1.88O8(OH)6.00. The crystal structure refinement and bond valence analysis are consistent with these cation site assignments. The formation of Sb-rich segnitite opens new possibilities for Sb sinks within the supergene zone. Segnitite may, in fact, be an ideal host for the sequestering of several toxic elements for pH < 2. At higher pH values, As is more likely to be incorporated into schwertmannite and ferrihydrite. |
Keywords: | μ-EXAFS; XANES; crystal structure; segnitite; antimony; valency; alunite supergroup; oxidized zone |
Rights: | © 2014 Mineralogical Society of America |
DOI: | 10.2138/am.2014.4834 |
Published version: | http://dx.doi.org/10.2138/am.2014.4834 |
Appears in Collections: | Aurora harvest 7 Chemical Engineering publications |
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