Jarosite Solid Solution Associated with Arsenic-Rich Mine Waters, Macraes Mine, New Zealand

Kerr, Gemma; Druzbicka, Joanna; Lilly, Kat; Craw, D.

doi:10.1007/s10230-014-0285-5

Cited by 10 publications

(1 citation statement)

References 24 publications

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“…Jarosite occurs under sulfate-rich and low pH conditions, such as in acid mine drainage and acid rock drainage (ARD) environments and also acid sulfate soil (ASS) wetlands. − Jarosite has a variable composition due to its ability to incorporate a wide range of anion and cation substitutions in its structure . It can also be an important host phase for metalloids such as As and Sb in ASS wetland sediments and AMD/ARD environments. − In particular, extremely high concentrations of As and Sb (up to several thousand ppm) have been found in jarosite samples from AMD environments. − …”

Section: Introductionmentioning

confidence: 99%

Antimony and Arsenic Behavior during Fe(II)-Induced Transformation of Jarosite

Karimian

Johnston

Burton

2017

Environ. Sci. Technol.

110

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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 Fe coincident with a rise in pH. These conditions can also trigger the Fe-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 Fe-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 Fe (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 Fe (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 Fe, while Sb L-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 Fe-induced transformation of As/Sb-jarosite can increase Sb mobility and exert major influences on As partitioning and speciation.

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