Contribution to the certification of B, Cd, Mg, Pb, Rb, Sr, and U in a natural water sample for the International Measurement Evaluation Programme Round 9 (IMEP-9) using ID-ICP-MS |
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Authors: | J Vogl C R Quétel M Ostermann I Papadakis L Van Nevel P D P Taylor |
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Institution: | (1) European Commission, Joint Research Center, Institute for Reference Materials and Measurements, Retieseweg, B-2440 Geel, Belgium e-mail: christophe.quetel@irmm.jrc.be Tel.: +32-14-571-658 Fax: +32-14-571-863, BE |
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Abstract: | The present paper describes the contribution of the Institute for Reference Materials and Measurements to the certification
of B, Cd, Mg, Pb, Rb, Sr, and U amount contents in a natural water sample, in round 9 of the International Measurement Evaluation
Programme (IMEP-9). The analytical procedure to establish the reference values for B, Cd, Mg, Pb, Rb, Sr, and U amount contents
was based on isotope dilution inductively coupled plasma-mass spectrometry used as a primary method of measurement. Applying
this procedure reference values, traceable to the SI, were obtained for the natural water sample of IMEP-9. For each of the
certified amount contents presented here a total uncertainty budget was calculated using the method of propagation of uncertainties
according to ISO and EURACHEM guidelines. The measurement procedures, as well as the uncertainty calculations are described
for all seven elements mentioned above. In order to keep the whole certification process transparent and so traceable, the
preparations of various reagents and materials as well as the sample treatment and blending, the measurements themselves,
and finally the data treatment are described in detail. Explanations focus on Pb as a representative example. The total uncertainties
(relative) obtained were less than 2% for all investigated elements at amount contents in the pmol/kg up to the high μmol/kg
range, corresponding to low μg/kg and mg/kg levels.
Received: 21 October 1999 / Accepted: 29 January 2000 |
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Keywords: | IMEP-9 ID-ICP-MS IDMS Uncertainty budget Certification |
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