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Issue 10, 2016
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Transformation of mackinawite to greigite by trichloroethylene and tetrachloroethylene

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Abstract

Trichloroethylene (TCE) and tetrachloroethylene (PCE) are common ground water contaminants susceptible to reductive dechlorination by FeS (mackinawite) in anaerobic environments. The objective of this study was to characterize the mineral-associated products that form when mackinawite reacts with TCE and PCE. The dissolved products of the reaction included Cl and Fe2+, and trace amounts of cis 1,2-dichloroethylene (for TCE) and TCE (for PCE). Selected area electron diffraction (SAED) analysis identified greigite as a mackinawite oxidation product formed after reaction between TCE or PCE and FeS over seven weeks. Release of Fe2+ is consistent with the solid state transformation of mackinawite to greigite, resulting in depletion of the solid with Fe. X-ray photoelectron spectroscopy of the sulfur 2p peak showed a shift to a higher binding energy after FeS reacted with TCE or PCE, also observed in other studies of mackinawite oxidation to greigite. The results may help efforts to maintain the reactivity of FeS generated to remediate chlorinated aliphatic contaminants in ground water.

Graphical abstract: Transformation of mackinawite to greigite by trichloroethylene and tetrachloroethylene

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Publication details

The article was received on 19 Aug 2016, accepted on 21 Sep 2016 and first published on 29 Sep 2016


Article type: Paper
DOI: 10.1039/C6EM00461J
Citation: Environ. Sci.: Processes Impacts, 2016,18, 1266-1273
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    Transformation of mackinawite to greigite by trichloroethylene and tetrachloroethylene

    Y. Lan, A. S. Elwood Madden and E. C. Butler, Environ. Sci.: Processes Impacts, 2016, 18, 1266
    DOI: 10.1039/C6EM00461J

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