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Determination of the total purity of a high-purity silver material to be used as a primary standard for element determination

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Abstract

A candidate material for the use as primary standard for silver determination was characterized with respect to total purity. Except the radioactive elements and He, all possible impurities were considered. Based on glow discharge mass spectrometry, inductively coupled plasma-mass spectrometry and carrier gas hot extraction measurements, the demonstrated total purity and its standard uncertainty is w(Ag) = (99.999 52 ± 0.000 11) %. The purity value and its uncertainty is dominated by the contributions from the measurements of the nonmetallic impurities, namely S, N, C and O.

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Acknowledgments

The authors would like to thank J. Pfeifer, A. Schulz and N. Langhammer from BAM for sharing experiences and their practical support in GDMS, ICP-MS and CGHE. The fruitful discussion with the colleagues from CCQM especially with Ralph Sturgeon from NRC on traceability issues is gratefully acknowledged. The authors would like to thank the colleagues from EMRP SIB09 “Elements” for discussion. The EMRP is jointly funded by the EMRP participating countries within EURAMET (the European body representing NMIs and DIs) and the European Commission.

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Authors and Affiliations

  1. National Institute of Metrology, Beijing, 100013, China

    Tao Zhou

  2. BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489, Berlin, Germany

    Silke Richter, Ralf Matschat & Heinrich Kipphardt

Authors
  1. Tao Zhou
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  2. Silke Richter
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  3. Ralf Matschat
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  4. Heinrich Kipphardt
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Correspondence to Heinrich Kipphardt.

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Zhou, T., Richter, S., Matschat, R. et al. Determination of the total purity of a high-purity silver material to be used as a primary standard for element determination. Accred Qual Assur 18, 341–349 (2013). https://doi.org/10.1007/s00769-013-0988-5

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  • DOI: https://doi.org/10.1007/s00769-013-0988-5

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