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DOI: 10.1039/A607674B (Paper) Reference Section for: J. Anal. At. Spectrom., 1997, 12, 567-572

Certification of the Rubidium Concentration in Water Materials for the International Measurement Evaluation Programme (IMEP) Using Isotope Dilution Inductively Coupled Plasma Mass Spectrometry

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ULF ÖRNEMARK, PHILIP D. P. TAYLOR and PAUL DE BIÈVRE

Abstract

This paper describes the certification of rubidium in synthetic and natural water samples for Round 6 of the Institute for Reference Materials and Measurements International Measurement Evaluation Programme (IMEP). The analytical procedure is based on isotope dilution ICP-MS as the primary method of measurement. Ion exchange chromatography was used to eliminate the isobaric interference on87Rb from 87Sr. By using the adopted procedure, SI-traceable values with expanded uncertainties (U=2uc) of ≤2% were obtained for rubidium at nmol kg-1 (low µg kg-1) levels. Results from 42 field laboratories participating in IMEP-6 are evaluated against the certified values.

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