Show simple item record

dc.contributor.authorSmeaton, C.
dc.contributor.authorWalshe, G.
dc.contributor.authorSmith, A.
dc.contributor.authorHudson-Edwards, K.
dc.contributor.authorDubbin, W.
dc.contributor.authorWright, Kathleen
dc.contributor.authorBeale, A.
dc.contributor.authorFryer, B.
dc.contributor.authorWeisener, C.
dc.date.accessioned2017-01-30T15:38:42Z
dc.date.available2017-01-30T15:38:42Z
dc.date.created2013-01-13T20:00:17Z
dc.date.issued2012
dc.identifier.citationSmeaton, Christina and Walshe, Gillian and Smith, Adrian and Hudson-Edwards, Karen and Dubbin, William and Wright, Kate and Beale, Andrew and Fryer, Brian and Weisener, Christopher. 2012. Simultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32. Environmental Science & Technology. 46 (23): pp. 12823-12831.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/48298
dc.identifier.doi10.1021/es3021809
dc.description.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 (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.

dc.publisherAmerican Chemical Society
dc.titleSimultaneous Release of Fe and As during the Reductive Dissolution of Pb-As Jarosite by Shewanella putrefaciens CN32
dc.typeJournal Article
dcterms.source.volume46
dcterms.source.startPage12823
dcterms.source.endPage12831
dcterms.source.issn0013-936X
dcterms.source.titleEnvironmental Science & Technology
curtin.department
curtin.accessStatusFulltext not available


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record