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Related Experiment Videos

Quantifying uncertainty: calculating interval estimates using quality control results.

J A Schofield1, K Miller, L Blume

  • 1DynCorp, Systems and Solutions, LLC, 6101 Stevenson Avenue, Alexandria, VA 22304, USA. judy.schofield@dyncorp.com

Quality Assurance (San Diego, Calif.)
|January 30, 2003
PubMed
Summary
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The Lake Michigan Mass Balance Study monitored pollutants to create models for managing toxic substances. Quality assurance and uncertainty assessments were crucial for reliable environmental decision-making.

Area of Science:

  • Environmental Science
  • Ecosystem Studies
  • Toxicology

Background:

  • The Great Lakes National Program Office (GLNPO) initiated an extensive study of the Lake Michigan ecosystem.
  • Understanding pollutant loads and their environmental fate is critical for ecosystem health.

Purpose of the Study:

  • To construct mass balance models for key contaminants (PCBs, atrazine, mercury, trans-nonachlor) in Lake Michigan.
  • To develop a tool for evaluating management strategies and control options for toxic substances.
  • To address the uncertainty inherent in environmental measurements for informed decision-making.

Main Methods:

  • Coordinated monitoring of tributary and atmospheric pollutant loads.
  • Development of source inventories for toxic substances.

Related Experiment Videos

  • Application of mathematical mass balance modeling.
  • Implementation of comprehensive quality assurance (QA) activities.

    • Main Results:

    • Established a framework for assessing data quality at the dataset level.
    • Developed quantitative methods for defining data quality.
    • Pioneered approaches for deriving interval estimates to represent uncertainty in sample results.

    Conclusions:

    • Mass balance models provide a robust tool for environmental management decisions.
    • Explicitly addressing and quantifying data uncertainty is essential for effective policy-making.
    • The study provides a foundation for ongoing toxic substance control in Lake Michigan.