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Related Experiment Videos

International Measurement Evaluation Programme: IMEP-9, trace elements in water.

I Papadakis1, J V Nørgaard, E Vendelbo

  • 1European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg, B-2440 Geel, Belgium. ioannis.papadakis@irmm.jrc.be

The Analyst
|March 10, 2001
PubMed
Summary

The International Measurement Evaluation Programme (IMEP) assessed trace elements in water across 201 labs. Results showed comparability between laboratories, validating measurement techniques for environmental analysis.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Metrology

Background:

  • The International Measurement Evaluation Programme (IMEP) has facilitated interlaboratory comparisons since 1988.
  • IMEP-9 represents the third comprehensive evaluation of trace elements in water samples.
  • This program is coordinated by the Institute for Reference Materials and Measurements (IRMM).

Purpose of the Study:

  • To establish SI-traceable reference values for 15 elements in water.
  • To evaluate the comparability of results from 201 participating laboratories worldwide.
  • To assess the performance of various measurement techniques for trace element analysis in water.

Main Methods:

  • Reference values were primarily established using isotope dilution mass spectrometry (IDMS), a primary measurement method.

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  • For elements not certifiable by IDMS, alternative measurement techniques were employed.
  • Results from 201 laboratories across 35 countries were compared against established reference values.

    • Main Results:

    • SI-traceable reference values with combined uncertainties were determined for 15 trace elements.
    • The study evaluated the performance of a large international network of laboratories.
    • Graphical representations illustrate the comparability of results among participating laboratories.

    Conclusions:

    • The study successfully established reliable reference values for trace elements in water.
    • IMEP-9 demonstrated the general comparability of analytical results across diverse laboratories and methods.
    • The findings contribute to quality assurance in environmental water monitoring and chemical analysis.