title: Antimony and Arsenic Behavior during Fe(II)-Induced Transformation of Jarosite.
abstract: Jarosite can be an important scavenger for arsenic (As) and antimony (Sb) in acid mine drainage (AMD) and acid sulfate soil (ASS) environments. When subjected to reducing conditions, jarosite may undergo reductive dissolution, thereby releasing As, Sb, and Fe2+coincident with a rise in pH. These conditions can also trigger the Fe2+-induced transformation of jarosite to more stable Fe(III) minerals, such as goethite. However, the consequences of this transformation process for As and Sb are yet to be methodically examined. We explore the effects of abiotic Fe2+-induced transformation of jarosite on the mobility, speciation, and partitioning of associated As(V) and Sb(V) under anoxic conditions at pH 7. High concentrations of Fe2+(10 and 20 mM) rapidly (<10 min) transformed jarosite to a green rust intermediary, prior to the subsequent precipitation of goethite within 24 h. In contrast, lower concentrations of Fe2+(1 and 5 mM) led to the formation of lepidocrocite. As K-edge XANES spectroscopy revealed some reduction of As(V) to As(III) at higher concentrations of Fe2+, while Sb L1-edge XANES spectroscopy indicated no reduction of Sb(V). The transformation processes enhanced Sb mobilization into the aqueous phase, while As was instead repartitioned to a surface-bound exchangeable phase. The results imply that Fe2+-induced transformation of As/Sb-jarosite can increase Sb mobility and exert major influences on As partitioning and speciation.
authors.affiliation: Southern Cross GeoScience, Southern Cross University , Lismore, NSW 2480, Australia.
authors.forename: Niloofar
authors.identifier: 0000-0002-8444-6610
authors.initials: N
authors.lastname: Karimian
authors.affiliation: Southern Cross GeoScience, Southern Cross University , Lismore, NSW 2480, Australia.
authors.forename: Scott G
authors.identifier: 0000-0002-5826-5613
authors.initials: SG
authors.lastname: Johnston
authors.affiliation: Southern Cross GeoScience, Southern Cross University , Lismore, NSW 2480, Australia.
authors.forename: Edward D
authors.initials: ED
authors.lastname: Burton
mesh_terms: D000965:Antimony / Q000737:chemistry; D001151:Arsenic; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry; D008906:Mining; D010084:Oxidation-Reduction
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D000965:Antimony; D001151:Arsenic