Iron and sulfur mineral analysis methods for natural attenuation assessments

Lonnie G. Kennedy, Jess W. Everett, Kevin J. Ware, Robert Parsons, Valerie Green

    Research output: Contribution to journalArticlepeer-review

    1 Scopus citations

    Abstract

    Based on electron acceptor abundance, Fe3+ and SO42- reduction by bacteria may play a dominant role in intrinsic bioremediation of some organic contaminants in the subsurface. Both Fe3+ and SO42- reduction processes involve mineral phases and may not be properly understood by evaluating only groundwater concentrations. Fe and S mineral analyses should be incorporated in natural attenuation studies; however, inherent problems with sample collection and analysis have discouraged such efforts. Methods are presented here for (1) sediment collection and anoxic preservation, (2) evaluation of biologically available Fe3+ and biogenically produced Fe2+ minerals, and (3) a simplified extended mineral sulfide analysis for ∼FeS and S°+FeS2. These techniques are demonstrated to evaluate Fe3+ and SO42- reduction at three sites where the soil or aquifer matrix had been contaminated with gasoline fuel, methane gas, or landfill leachate. It is expected that these techniques will permit Fe and S mineral analyses to become a routine part of natural attenuation assessments.

    Original languageEnglish (US)
    Pages (from-to)259-276
    Number of pages18
    JournalBioremediation Journal
    Volume2
    Issue number3-4
    DOIs
    StatePublished - 1998

    All Science Journal Classification (ASJC) codes

    • Environmental Science(all)

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