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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Putirka, Keith / Swainson, Ian

IMPACT FACTOR 2015: 1.918
5-year IMPACT FACTOR: 2.196
Rank 9 out of 29 in category Mineralogy and 37 out of 81 in category Geochemistry & Geophysics in the 2015 Thomson Reuters Journal Citation Report/Science Edition

SCImago Journal Rank (SJR) 2015: 1.185
Source Normalized Impact per Paper (SNIP) 2015: 0.979
Impact per Publication (IPP) 2015: 1.929

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Sequential extraction and DXRD applicability to poorly crystalline Fe- and Al-phase characterization from an acid mine water passive remediation system

1 / Tobias S. Rötting2 / José Miguel Nieto1 / Carlos Ayora3

1Geology Department, University of Huelva, Campus “El Carmen,” E-21071 Huelva, Spain

2Newcastle University, Sir Joseph Swan Institute for Energy Research, Hydrogeochemical Engineering and Outreach group, Newcastle upon Tyne, NE1 7RU, U.K.

3Institute of Environmental Assessment and Water Research, CSIC, Jordi Girona 18, E-08034 Barcelona, Spain

Citation Information: American Mineralogist. Volume 94, Issue 7, Pages 1029–1038, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2009.3137, April 2015

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Iron and Al precipitates play very important hydrochemical and environmental roles in aquatic environments affected by acid mine drainage. Despite their great importance, reliable characterization of these precipitates is problematic due to the high proportion of amorphous or poorly ordered mineral phases comprising these precipitates and because of their coexistence with intermediate to highly crystalline phases. To facilitate and improve the characterization of poorly ordered Fe and Al phases, a coupled differential X-ray diffraction (DXRD) and sequential extraction (SE) study was performed on a set of samples from an acid mine water passive treatment system. The results of these techniques indicate the presence of schwertmannite and goethite in the upper 5 cm of the passive treatment reactive material. Furthermore, a progressive decrease of the SO42- adsorbed to the schwertmannite surface is suggested by one of the SE steps. The presence of hydrobasaluminite and amorphous Al(OH)3 is suggested on the basis of SE and thermodynamic modeling analysis. These techniques also allow a quantitative estimation of the proportion of each mineral present. As a result, a complete study of the distribution of each mineral throughout the reactive material profile and the role of each phase in removing metals from the mine water can be obtained. This information is useful, not only to improve the reactive material design, but also to understand the natural processes taking place in aquatic systems affected by mining.

Keywords : Sequential extraction; DXRD; schwertmannite; hydrobasaluminite; amorphous Al(OH)3; acid mine drainage; passive treatment system

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