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Uncertainty evaluation in reference material characterization by double isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS)

Journal Article · · Metrologia
 [1]
  1. Korea Research Institute of Standards and Science (KRISS), Daejeon (Korea, Republic of)
Double isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) is one of the most important measurement methods in the establishment of measurement standards for inorganic analysis. However, there is still no good consensus on approaches for uncertainty evaluation in double ID-ICP-MS. Particularly, approaches to treating the instrumental isotopic fractionation (IIF) phenomenon and correlation between uncertainty sources are diverse and often unclear in the literature. Here, an approach for uncertainty evaluation in double ID-ICP-MS measurements is described. Using three certified reference materials (CRMs), it is shown that the IIF effects cancel out and should not be included in the uncertainty budget. Further, a consistent way of considering correlated sources of uncertainty to prevent double counting of uncertainties is described in detail along with an example of measuring the mass fraction of magnesium in an oyster powder CRM.
Research Organization:
USDOE Office of Science (SC), Office of Isotope R&D and Production (IRP)
Sponsoring Organization:
USDOE
OSTI ID:
2424950
Journal Information:
Metrologia, Journal Name: Metrologia Journal Issue: 6 Vol. 59; ISSN 0026-1394
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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