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  • Certification of rubidium in water material for the International Measurement Evaluation Programme (IMEP) using isotope dilution inductively coupled plasma-mass spectrometry

Abstract

This paper describes the certification of rubidium in synthetic and natural water samples for Round 6 of the IRMM-International Measurement Evaluation Programme (IMEP). The analytical procedure is based on isotope dilution inductively coupled plasma-mass spectrometry (ICP-MS) as primary method of measurement. Ion exchange chromatography was used to eliminate the isobaric interference on (87)Rb from (87)Sr. By using the adopted procedure, SI-traceable values with expanded uncertainties (U = 2 u(c)) of < 2% were obtained for rubidium at nmol/kg (low µg/kg) levels. Results from 42 field laboratories participating in IMEP-6 are evaluated against the certified values.

Additional information

Authors: ORNEMARK U, JRC Geel (BE);TAYLOR P D P, JRC Geel (BE);DE BIEVRE P, JRC Geel (BE)
Bibliographic Reference: Article: Journal of Analytical Atomic Spectrometry (1996)
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