Experimental simulation of soil contamination by arsenolite

Yue, Ziming; Donahoe, Rona J.

doi:10.1016/j.apgeochem.2008.12.016

Cited by 12 publications

(3 citation statements)

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“…Hence, the prevalence of As(III) over As(V) is not surprising even though the droplets are saturated with oxygen. Interestingly, the dissolution of arsenolite can be self-sustained or self-catalyzed to a certain extent, as reported by ref and assumed by ref . If so, this would be an important analogy between the As-AMW and iron-sulfate AMD.…”

Section: Resultsmentioning

confidence: 52%

“…The evolution of As-AMW is afterward controlled by the sluggish reactions of As 2 O 3 dissolution and arsenic oxidation. Laboratory experiments with arsenolite dissolution reported that the system was after 1 month “far from equilibrium” . From their data, it seems that the system may reach equilibrium after several months or perhaps even after a year.…”

Section: Resultsmentioning

confidence: 99%

“…Laboratory experiments with arsenolite dissolution reported that the system was after 1 month "far from equilibrium". 38 From their data, it seems that the system may reach equilibrium after several months or perhaps even after a year. Oxidation of As(III) to As(V) in an acidic aqueous phase is also slow, much slower than at circumneutral pH.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Arsenic-Rich Acid Mine Water with Extreme Arsenic Concentration: Mineralogy, Geochemistry, Microbiology, and Environmental Implications

Majzlan

Plášil

Škoda

et al. 2014

Environ. Sci. Technol.

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Extremely arsenic-rich acid mine waters have developed by weathering of native arsenic in a sulfide-poor environment on the 10th level of the Svornost mine in Jáchymov (Czech Republic). Arsenic rapidly oxidizes to arsenolite (As2O3), and there are droplets of liquid on the arsenolite crust with high As concentration (80,000-130,000 mg·L(-1)), pH close to 0, and density of 1.65 g·cm(-1). According to the X-ray absorption spectroscopy on the frozen droplets, most of the arsenic is As(III) and iron is fully oxidized to Fe(III). The EXAFS spectra on the As K edge can be interpreted in terms of arsenic polymerization in the aqueous solution. The secondary mineral that precipitates in the droplets is kaatialaite [Fe(3+)(H2AsO4)3·5H2O]. Other unusual minerals associated with the arsenic lens are běhounekite [U(4+)(SO4)2·4H2O], štěpite [U(4+)(AsO3OH)2·4H2O], vysokýite [U(4+)[AsO2(OH)2]4·4H2O], and an unnamed phase (H3O)(+)2(UO2)2(AsO4)2·nH2O. The extremely low cell densities and low microbial biomass have led to insufficient amounts of DNA for downstream polymerase chain reaction amplification and clone library construction. We were able to isolate microorganisms on oligotrophic media with pH ∼ 1.5 supplemented with up to 30 mM As(III). These microorganisms were adapted to highly oligotrophic conditions which disabled long-term culturing under laboratory conditions. The extreme conditions make this environment unfavorable for intensive microbial colonization, but our first results show that certain microorganisms can adapt even to these harsh conditions.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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