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Metrologia Volume 43 Technical Supplement Create an alert RSS this journal

Michael Weber and Jürg Wüthrich 2006 Metrologia 43 08012 doi:10.1088/0026-1394/43/1A/08012

Key comparison CCQM-K29: Anion calibration solutions: final report

Michael Weber and Jürg Wüthrich

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KEY COMPARISON

In this key comparison anion calibration solutions of chloride and phosphate were investigated. The contents of both solutions were about 1 g/kg relative to the anion mass. For the chloride comparison 10 participants provided results by the following three analytical techniques: coulometry, titrimetry and ion chromatography. The phosphate amount content was determined by 10 NMIs whereby the following 6 techniques were applied: ion chromatography, titrimetry, ICP-OES, gravimetry, UV-Vis and ion-exchange followed by coulometry. The following institutes participated in this key comparison:

  • BAM and PTB (Germany)
  • BNM-LNE (France)
  • CENAM (Mexico)
  • EMPA (Switzerland)
  • GUM (Poland)
  • INTEC (Chile)
  • KRISS (Korea)
  • NMIJ (Japan)
  • NRCCRM (China)
  • SMU (Slovakia)
With one exception all results were found within the range of ±0.25% with respect to the gravimetric value. The variability (RSD) of the results is below 0.1% for both the chloride and the phosphate solution (chloride without CENAM result). Compared to the pilot study CCQM-P32 the results of CCQM-K29 were significantly better. This is especially true for the phosphate comparison.

Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.

The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).


Dates

Issue 1A ( 1 January 2006)



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