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ALASCA proficiency testing scheme for occupational hygiene laboratories.

Eddy Langlois1, Alain Boulet, Edmond Kauffer

  • 1Institut National de Recherche et de Sécurité, 50 av de Bourgogne, BP27 54501, Vandoeuvre Cedex, France.

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Proficiency testing schemes (PTS) are crucial for analytical laboratories to ensure quality. This study details a robust PTS for industrial hygiene, enhancing performance assessment through unique methods and a computerized system.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Laboratory Quality Assurance

Background:

  • Quality assurance is vital for analytical laboratories performing routine and R&D analyses.
  • Proficiency testing schemes (PTS) are powerful tools for evaluating analytical bias and dispersion.
  • In industrial hygiene, analytical uncertainty may be underestimated relative to sampling uncertainty.

Purpose of the Study:

  • To present a comprehensive overview of a proficiency testing scheme (PTS) organized by INRS's 'Métrologie des Polluants' department since 2002.
  • To highlight the unique features and strengths of the scheme in providing reliable performance assessments for analytical laboratories.
  • To detail the technical and organizational aspects that contribute to the scheme's effectiveness.

Main Methods:

  • Determination of assigned values using a method independent of the analytical techniques being tested.
  • Development of novel tools for sample preparation and fabrication.
  • Application of a robust statistical model based on the WASP HSL scheme.
  • Implementation of a fully computerized system for data management and reporting.
  • Utilization of a secure website for participant result submission.

Main Results:

  • The scheme provides a reliable performance assessment for participating laboratories.
  • Original tools and methods ensure the integrity of sample preparation and assigned value determination.
  • A strong statistical model effectively visualizes participant performance in terms of bias and dispersion.
  • A computerized system streamlines all aspects of the proficiency testing process, from database management to report generation.

Conclusions:

  • The described proficiency testing scheme offers a reliable and advanced method for assessing laboratory performance in industrial hygiene analysis.
  • The integration of independent value assignment, innovative sample preparation, robust statistics, and a computerized system represents a significant advancement in quality assurance.
  • The scheme's features, including participant communication and secure online submission, enhance its overall effectiveness and user experience.