Chromate reduction and retention processes within arid subsurface environments.
作者： Matthew Ginder-Vogel , Thomas Borch , Melanie A. Mayes , Phillip M. Jardine , Scott Fendorf
DOI: 10.1021/ES050535Y
关键词:
摘要: Chromate is a widespread contaminant that has deleterious impacts on human health, the mobility and toxicity of which are diminished by reduction to Cr(III). While biological chemical reactions Cr(VI) well resolved, within natural sediments, particularly arid environments, remains poorly described. Here, we examine chromate sediments from Hanford, WA site, where Fe(III) (hydr)oxide carbonate coatings limit mineral reactivity. Chromium(VI) Hanford negligible unless pretreated with acid; acidic pretreatment packed beds having feed solution results in Cr(III) associating minerals antigorite lizardite addition magnetite Fe(II)-bearing clay minerals. Highly alkaline conditions (pH > 14), representative near high-level nuclear waste tanks, result Fe(II) dissolution concurrent reduction. Additionally, found associated portland...
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