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Related Experiment Videos

Standard Reference Materials for dioxins and other environmental pollutants.

R Alvarez1

  • 1Standard Reference Materials Program, National Institute of Standards & Technology, Gaithersburg, MD 20899.

The Science of the Total Environment
|May 1, 1991
PubMed
Summary

The National Institute of Standards and Technology provides certified Standard Reference Materials (SRMs) to improve the accuracy of environmental pollutant analysis, including chlorinated dioxins. These SRMs aid chemists in reliable sample testing for organic pollutants.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • The National Institute of Standards and Technology (NIST) offers over 1100 Standard Reference Materials (SRMs).
  • SRMs are crucial for ensuring accuracy in chemical composition and physical property measurements.
  • Specific SRMs are designed to enhance the reliability of analyzing environmental samples for organic pollutants like chlorinated dioxins.

Purpose of the Study:

  • To highlight the role of NIST Standard Reference Materials (SRMs) in environmental analysis.
  • To detail the certification process for SRMs used in detecting organic pollutants.
  • To introduce specific SRMs relevant to dioxin and polychlorinated biphenyl analysis.

Main Methods:

  • Certification of natural matrix SRMs involves concordant analyses using at least two independent methods.

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  • Calibration solution SRMs, like SRM 1614, are certified based on gravimetric preparation and experimental validation.
  • Gas chromatography/mass spectrometry methods are employed, utilizing labeled compounds as internal standards.

    • Main Results:

    • SRM 1614 (Dioxin in Isooctane) provides certified concentrations for both unlabeled (98.3 ± 3.3 ng g⁻¹) and 13C-labeled (95.6 ± 1.5 ng g⁻¹) 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD).
    • SRM 1588 (Organics in Cod Liver Oil) and SRM 1589 (PCBs in Human Serum) offer non-certified dioxin concentrations.
    • Published literature reports concentrations of chlorinated dioxins in urban particulate SRMs.

    Conclusions:

    • NIST SRMs are essential tools for accurate environmental monitoring of organic pollutants.
    • The rigorous certification process ensures the reliability of SRMs for analytical chemistry applications.
    • Availability of labeled internal standards in SRMs facilitates advanced analytical techniques like GC/MS.