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Identifying source correlation parameters for hydrocarbon wastes using compound-specific isotope analysis.

Rupert L Hough1, Martin Whittaker, Anthony E Fallick

  • 1Integrated Waste Management Centre, Sustainable Systems Department, School of Industrial and Manufacturing Science, Cranfield University, Cranfield MK43 0AL, UK.

Environmental Pollution (Barking, Essex : 1987)
|February 2, 2006
PubMed
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Compound-specific isotope analysis (CSIA) shows promise for identifying petroleum sources in contaminated soils. Isoprenoid delta(13)C values, like norpristane, are stable indicators for source correlation.

Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Isotope Geochemistry

Background:

  • Petroleum contamination in soils poses environmental challenges.
  • Accurate identification of petroleum sources is crucial for effective remediation.
  • Traditional methods for source correlation can be limited, especially for weathered oils.

Purpose of the Study:

  • To evaluate compound-specific isotope analysis (CSIA) as a novel method for petroleum source identification.
  • To assess the stability of delta(13)C values in n-alkanes and isoprenoids over time in contaminated soils.
  • To determine the potential of specific compounds as reliable source correlation parameters.

Main Methods:

  • Establishment of soil microcosms contaminated with ballast, crude, or No. 6 fuel oil.

Related Experiment Videos

  • Periodic sampling of microcosms over 256 days.
  • Determination of delta(13)C values for five n-alkanes and norpristane using gas chromatography-isotope ratio mass spectrometry (GC-IRMS).

    • Main Results:

    • No significant temporal shifts in delta(13)C values were observed for the five n-alkanes across all oil types.
    • Isoprenoid delta(13)C values, particularly for norpristane, showed the least susceptibility to biotransformation.
    • delta(13)C values of isoprenoids demonstrated stability in identifying petroleum sources.

    Conclusions:

    • CSIA, specifically the delta(13)C of isoprenoids like norpristane, is a viable alternative for petroleum source correlation in contaminated soils.
    • Isoprenoids are robust biomarkers for tracing petroleum origins, even in weathered or biodegraded samples.
    • This method offers a valuable tool for environmental forensics and site remediation efforts.