Effect of pH on Aqueous Se(IV) Reduction by Pyrite

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Abstract

Interaction of aqueous Se(IV) with pyrite was investigated using persistently stirred batch reactors under O2-free conditions at pH ranging from 4.5 to 6.6. Thermodynamic calculations, an increase in pH during the experiments, and spectroscopic observation indicate that the reaction of aqueous Se(IV) by pyrite results in the formation of Se(0) and the release of Fe(II). The aqueous Se(IV) reduction rate follows a pseudofirst order. A ferrous iron mediated electron transfer mechanism is proposed to operate during the reduction of aqueous Se(IV) by pyrite. pH and iron concentration affect significantly on Se(IV) reaction rate and reaction product.

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Original languageEnglish
Pages (from-to)2704-2710
JournalEnvironmental Science & Technology
Volume45
Issue number7
DOIs
Publication statusPublished - Apr 2011

Keywords

  • selenium, reduction, pyrite

ID: 209178