Journal
ENVIRONMENTAL FORENSICS
Volume 9, Issue 1, Pages 75-84Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15275920801888335
Keywords
natural attenuation; vadose zone; groundwater; carbon isotopes; carbon dioxide; methane; radiocarbon; stable carbon isotope analysis; soil gas; petroleum; methanogenesis
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Co-2 and CH4 radiocarbon and stable carbon isotope ratios were used to assess natural attenuation at a fuel-contaminated soil site at the Norfolk Navy Base, Norfolk, VA (USA). Soil gas samples were collected spatially over a monitoring network in October 2002 and in March 2003. CO2 and CH4 from regions with high petroleum concentrations were 14 C-depleted relative to uncontaminated areas. (14) C-depleted methane suggested methanogenic hydrocarbon degradation. The difference in CO2 age between background and plume-influenced areas indicated that approximately 90% of the CO2 at the latter was petroleum derived making contaminant the primary source of carbon for the microbial assemblage.
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