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Title: Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32

Abstract

Jarosites are produced during metallurgical processing, on oxidized sulfide deposits, and in acid mine drainage environments. Despite the environmental relevance of jarosites, few studies have examined their biogeochemical stability. This study demonstrates the simultaneous reduction of structural Fe(III) and aqueous As(V) during the dissolution of synthetic Pb–As jarosite (PbFe 3(SO 4,AsO 4) 2(OH) 6) by Shewanella putrefaciens using batch experiments under anaerobic circumneutral conditions. Fe(III) reduction occurred immediately in inoculated samples while As(V) reduction was observed after 72 h. XANES spectra showed As(III) (14.7%) in the solid phase at 168 h coincident with decreased aqueous As(V). At 336 h, XANES spectra and aqueous speciation analysis demonstrated 20.2% and 3.0% of total As was present as As(III) in the solid and aqueous phase, respectively. In contrast, 12.4% of total Fe was present as aqueous Fe(II) and was below the detection limits of XANES in the solid phase. TEM-EDS analysis at 336 h showed secondary precipitates enriched in Fe and O with minor amounts of As and Pb. Based on experimental data and thermodynamic modeling, we suggest that structural Fe(III) reduction was thermodynamically driven while aqueous As(V) reduction was triggered by detoxification induced to offset the high As(V) (328 μM) concentrations releasedmore » during dissolution.« less

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [2];  [2]
  1. RIGB
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1056700
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 46; Journal Issue: 23; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Smeaton, Christina M, Walshe, Gillian E, Smith, Adrian M.L., Hudson-Edwards, Karen A, Dubbin, William E, Wright, Kate, Beale, Andrew M, Fryer, Brian J, Weisener, Christopher G, Windsor), NHM), and UL). Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32. United States: N. p., 2012. Web. doi:10.1021/es3021809.
Smeaton, Christina M, Walshe, Gillian E, Smith, Adrian M.L., Hudson-Edwards, Karen A, Dubbin, William E, Wright, Kate, Beale, Andrew M, Fryer, Brian J, Weisener, Christopher G, Windsor), NHM), & UL). Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32. United States. doi:10.1021/es3021809.
Smeaton, Christina M, Walshe, Gillian E, Smith, Adrian M.L., Hudson-Edwards, Karen A, Dubbin, William E, Wright, Kate, Beale, Andrew M, Fryer, Brian J, Weisener, Christopher G, Windsor), NHM), and UL). Mon . "Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32". United States. doi:10.1021/es3021809.
@article{osti_1056700,
title = {Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32},
author = {Smeaton, Christina M and Walshe, Gillian E and Smith, Adrian M.L. and Hudson-Edwards, Karen A and Dubbin, William E and Wright, Kate and Beale, Andrew M and Fryer, Brian J and Weisener, Christopher G and Windsor) and NHM) and UL)},
abstractNote = {Jarosites are produced during metallurgical processing, on oxidized sulfide deposits, and in acid mine drainage environments. Despite the environmental relevance of jarosites, few studies have examined their biogeochemical stability. This study demonstrates the simultaneous reduction of structural Fe(III) and aqueous As(V) during the dissolution of synthetic Pb–As jarosite (PbFe3(SO4,AsO4)2(OH)6) by Shewanella putrefaciens using batch experiments under anaerobic circumneutral conditions. Fe(III) reduction occurred immediately in inoculated samples while As(V) reduction was observed after 72 h. XANES spectra showed As(III) (14.7%) in the solid phase at 168 h coincident with decreased aqueous As(V). At 336 h, XANES spectra and aqueous speciation analysis demonstrated 20.2% and 3.0% of total As was present as As(III) in the solid and aqueous phase, respectively. In contrast, 12.4% of total Fe was present as aqueous Fe(II) and was below the detection limits of XANES in the solid phase. TEM-EDS analysis at 336 h showed secondary precipitates enriched in Fe and O with minor amounts of As and Pb. Based on experimental data and thermodynamic modeling, we suggest that structural Fe(III) reduction was thermodynamically driven while aqueous As(V) reduction was triggered by detoxification induced to offset the high As(V) (328 μM) concentrations released during dissolution.},
doi = {10.1021/es3021809},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 23,
volume = 46,
place = {United States},
year = {2012},
month = {11}
}