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Ponzevera, Emmanuel; Quetel, Christophe R.; Hendrickx, Frans; Fortunato, Giuseppino. |
This paper describes the preparation of a new type of Pb delta-isotopic Certified Reference Materials (delta-iCRMs), available in liquid form (Pb mass fraction similar to 100 mu g g(-1), 2 mL, 3% HNO3) to prevent the risk of insufficient isotopic homogeneity. These materials are intended for the validation of delta-scale isotope ratio measurements, and come in four pairs. The quantities certified are the relative differences on values of n(Pb-207)/n(Pb-204), n(Pb-207)/n(Pb-206) and n(Pb-207)/n(Pb-208) ratios between the members of each pair. There is a material with similar to natural Pb-isotopic composition (ERM-3800, delta-0 material), common to all pairs, and the same similar to natural Pb progressively enriched in Pb-207 (ERM-3810 series). Pairs I to... |
Tipo: Text |
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Ano: 2009 |
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Quetel, Christophe R.; Ponzevera, Emmanuel; Rodushkin, Ilia; Gerdes, Axel; Williams, Ross; Woodhead, Jon. |
A blind comparison on Pb-isotope delta-scale measurements by MC-ICPMS of 0.01 parts per thousand to 0.1 parts per thousand level was organised, involving five laboratories. Test samples were obtained from the series of candidate ERM-3810 delta-isotopic Certified Reference Materials (delta-iCRMs), and comprise four pairs of a material with similar to natural Pb-isotopic composition ('delta zero' or 'delta-0') and the same natural Pb progressively enriched in Pb-207 (with delta Pb-207 values certified to similar to 0.1% relative uncertainty, k = 2). Participants were free to apply the measurement strategy of their choice. A result was considered 'acceptable' only when, simultaneously, there was agreement within stated uncertainties with the corresponding... |
Tipo: Text |
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Ano: 2009 |
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