Degradation of carbon disulphide (CS2) in soils and groundwater from a CS2 -contaminated site

Siobhan F. Cox, John D. McKinley, Andrew S. Ferguson, Gwen O'Sullivan, Robert M. Kalin

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    Abstract

    This study is the first investigation of biodegradation of carbon disulphide (CS2) in soil that provides estimates of degradation rates and identifies intermediate degradation products and carbon isotope signatures of degradation. Microcosm studies were undertaken under anaerobic conditions using soil and groundwater recovered from CS2-contaminated sites. Proposed degradation mechanisms were validated using equilibrium speciation modelling of concentrations and carbon isotope ratios. A first-order degradation rate constant of 1.25 × 10-2 h-1 was obtained for biological degradation with soil. Carbonyl sulphide (COS) and hydrogen sulphide (H2S) were found to be intermediates of degradation, but did not accumulate in vials. A 13C/12C enrichment factor of -7.5 ± 0.8 ‰ was obtained for degradation within microcosms with both soil and groundwater whereas a 13C/12C enrichment factor of -23.0 ± 2.1 ‰ was obtained for degradation with site groundwater alone. It can be concluded that biological degradation of both CS2-contaminated soil and groundwater is likely to occur in the field suggesting that natural attenuation may be an appropriate remedial tool at some sites. The presence of biodegradation by-products including COS and H2S indicates that biodegradation of CS2 is occurring and stable carbon isotopes are a promising tool to quantify CS2 degradation.

    Original languageEnglish
    Pages (from-to)1935-1944
    Number of pages10
    JournalEnvironmental Earth Sciences
    Volume68
    Issue number7
    Early online date15 Aug 2012
    DOIs
    Publication statusPublished - Apr 2013

    Keywords

    • Carbon disulphide
    • Carbon disulfide
    • Biodegradation
    • Microcosms
    • Natural attenuation
    • Stable carbon isotopes

    ASJC Scopus subject areas

    • Water Science and Technology
    • Pollution
    • Global and Planetary Change
    • Environmental Chemistry
    • Geology
    • Earth-Surface Processes
    • Soil Science

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