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A DANREF certified reference material for chromate in cement

J Kristiansen1, J M Christensen, K Byrialsen

  • 1National Institute of Occupational Health, Copenhagen, Denmark. jkr@ami.dk

The Analyst
|February 17, 1998
PubMed
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Reference materials for cement chromate were certified using an interlaboratory study. Only chromate speciation methods were accepted, yielding certified values of 0.678 and 6.04 mg CrVI kg-1.

Area of Science:

  • Environmental Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Chromate in cement is an environmental concern.
  • Accurate quantification of chromate is crucial for regulatory compliance and risk assessment.
  • Standardized reference materials are needed for method validation and quality control.

Purpose of the Study:

  • To produce and certify reference materials for chromate in cement.
  • To establish reliable reference values for low and high chromate levels in cement.
  • To compare results from different analytical methods, focusing on speciation techniques.

Main Methods:

  • Production of two candidate reference materials for chromate in cement.
  • An interlaboratory study involving fifteen laboratories.

Related Experiment Videos

  • Certification based on consensus means from laboratories using chromate speciation methods.

    • Main Results:

    • Certified values established at 0.678 (+/- 0.075) mg CrVI kg-1 (low level) and 6.04 (+/- 0.28) mg CrVI kg-1 (high level).
    • Methods relying on chromate speciation were exclusively used for certification.
    • Total chromium determination methods yielded results approximately 6.5% higher, with significant differences at high concentrations.

    Conclusions:

    • The certified reference materials provide reliable standards for chromate determination in cement.
    • Chromate speciation methods are essential for accurate quantification, especially at higher concentrations.
    • The study highlights the importance of method selection in achieving accurate chromate measurements in cementitious materials.