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Related Experiment Videos

Push-pull partitioning tracer tests using radon-222 to quantify non-aqueous phase liquid contamination.

B M Davis1, J D Istok, L Semprini

  • 1Department of Civil, Construction and Environmental Engineering, Oregon State University, Corvallis 97331, USA. davisbri@engr.orst.edu

Journal of Contaminant Hydrology
|September 19, 2002
PubMed
Summary

Naturally occurring radon in groundwater acts as a tracer to detect and measure non-aqueous phase liquid (NAPL) contamination. The single-well push-pull test using radon offers a cost-effective method for subsurface contamination assessment.

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Geochemistry

Background:

  • Naturally occurring radon in groundwater can serve as an in situ partitioning tracer.
  • This method aids in locating and quantifying non-aqueous phase liquid (NAPL) contamination.
  • It presents a potentially low-cost alternative to inter-well partitioning tracer tests.

Purpose of the Study:

  • To evaluate the utility of radon as a partitioning tracer in single-well push-pull tests.
  • To assess the methodology's effectiveness in laboratory and field settings for NAPL saturation estimation.
  • To quantify trichloroethene (TCE) and light non-aqueous phase liquid (LNAPL) saturations using radon retardation.

Main Methods:

  • Conducted laboratory push-pull tests in contaminated and non-contaminated sediment.

Related Experiment Videos

  • Applied the methodology in field wells at a former petroleum refinery with LNAPL contamination.
  • Utilized temporal moments and an approximate analytical solution to interpret breakthrough curves and estimate radon retardation factors.

    • Main Results:

    • Demonstrated radon retardation in the presence of TCE and LNAPL during laboratory and field tests.
    • Laboratory tests yielded radon retardation factors from 1.1 to 1.5, corresponding to TCE saturations of 0.2% to 0.9%.
    • Extraction-phase laboratory tests showed a radon retardation factor of 5.0, indicating 6.5% TCE saturation.

    Conclusions:

    • Radon retardation in single-well push-pull tests is a viable method for estimating NAPL saturations.
    • The methodology proved effective in both laboratory and field conditions.
    • Non-equilibrium partitioning and heterogeneous contaminant distribution may influence retardation factor and saturation estimates.