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Related Experiment Videos

Errors in NAPL volume estimates due to systematic measurement errors during partitioning tracer tests.

Michael C Brooks1, William R Wise

  • 1U.S. Environmental Protection Agency, Kerr Research Center, P.O. Box 1198, Ada, Oklahoma 74820, USA.

Environmental Science & Technology
|October 6, 2005
PubMed
Summary

This study quantifies errors in nonaqueous phase liquid (NAPL) saturation and volume estimates from partitioning tracer tests. Accurate flow measurements and minimizing baseline concentration errors are crucial for reliable NAPL site characterization.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrogeology

Background:

  • Moment-based analyses of partitioning tracer tests are used for estimating nonaqueous phase liquid (NAPL) saturation and volume.
  • Systematic errors in volume and concentration measurements can significantly impact these estimates.
  • Previous error quantification assumed equal partitioning and nonpartitioning masses, limiting general applicability.

Purpose of the Study:

  • To derive and apply expressions for propagating systematic errors in volume and concentration during partitioning tracer tests.
  • To provide practitioners with methods to bracket estimates of NAPL saturation and volume.
  • To relax previous assumptions and offer a more general scope for error analysis.

Main Methods:

  • Propagating errors for systematic constant (offset) volume, proportional volume, and constant (offset) concentration errors.

Related Experiment Videos

  • Utilizing nondimensional concentration to analyze the impact of proportional concentration errors.
  • Comparing current error propagation with previous efforts that assumed equal partitioning and nonpartitioning masses.

    • Main Results:

    • Derived expressions allow practitioners to bracket NAPL saturation and volume estimates.
    • Systematic proportional concentration errors do not affect the accuracy of the method when using nondimensional concentration.
    • The current work is more general by relaxing the assumption of equal partitioning and nonpartitioning masses.

    Conclusions:

    • Accurate flow measurements are essential for minimizing systematic errors in partitioning tracer tests.
    • Minimizing baseline concentration errors is critical to prevent the propagation of systematic errors.
    • The derived expressions enhance the reliability of NAPL saturation and volume estimates from tracer tests.