Traceability system for elemental analysis

Kipphardt, Heinrich; Matschat, Ralf; Rienitz, Olaf; Schiel, Detlef; Gernand, Wolfgang; Oeter, D.

doi:10.1007/s00769-005-0084-6

Cited by 37 publications

(20 citation statements)

References 5 publications

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“…For the characterization of the spike a back-spike has to be prepared in the same way, but using a pure element preferably in its metal form with the highest available purity. Whenever possible, BAM primary materials [90] are used in our group for preparing the back spike, because these materials offer smallest uncertainties, which allows us relative uncertainties for the back spike concentration between 10 -3 and 10 -4 . For the back spike the same applies as for the spike concerning dissolution, storing and weight monitoring (see above).…”

Section: Uncertainty Considerationsmentioning

confidence: 99%

Isotope dilution mass spectrometry — A primary method of measurement and its role for RM certification

Vogl

Pritzkow

2010

MAPAN

116

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This article describes the application of isotope dilution mass spectrometry (IDMS) to the field of reference material (RM) characterisation focusing on the approach, which is applied by the IDMS group at BAM. Emphasis is placed on IDMS measurements of highest analytical quality. Basic principles as well as the equation system are being recalled. Different calibration strategies, such as single, double or triple IDMS, are critically reviewed and the achievable uncertainties are discussed. Differences in the application of thermal ionization mass spectrometry (TIMS) and inductively coupled plasma mass spectrometry (ICPMS) are discussed as well as differences between different types of mass spectrometers such as single collector versus multi-collector or quadrupole versus magnetic sector instruments. Possible sources of errors and bias are mentioned and correction models introduced and applied within the past years are discussed. Several examples for RM characterisations in the field of elemental analysis are shown, each demonstrating excellent analytical quality. In general it can be stated that IDMS is the most important reference method for elemental analysis, offering highest accuracy and precision or smallest measurement uncertainties, when properly applied. Thus IDMS represents by far the best suited reference method for RM characterisation. Due to its universal applicability IDMS offers sufficient potential to follow future needs in analytical chemistry as well as in the RM sector.

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Section: Uncertainty Considerationsmentioning

confidence: 99%

Isotope dilution mass spectrometry — A primary method of measurement and its role for RM certification

Vogl

Pritzkow

2010

MAPAN

116

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“…BAM and the Physikalisch-Technische Bundesanstalt (PTB) 76 have national primary standards for elemental analysis, which are certified for their purity. 77 Thus high purity materials are available at the highest metrological level. These substances will be used as base material for the IRM and d-RM, unless unusual isotopic compositions occur.…”

Section: Discussionmentioning

confidence: 99%

Isotope reference materials for present and future isotope research

Vogl

Pritzkow

2010

J. Anal. At. Spectrom.

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“…The measurement uncertainties of all impurities present at more than 1 µg/g Fe were 5–8%. The uncertainty of the chemical purities could be estimated according to methods applied in CCQM‐key comparisons 3. The chemical purities of both isotopes were 99.94(1)%.…”

Section: Methodsmentioning

confidence: 99%

Absolute measurements and certified reference material for iron isotopes using multiple‐collector inductively coupled mass spectrometry

Zhou¹,

Zhao²,

Wang³

et al. 2008

Rapid Comm Mass Spectrometry

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Two enriched isotopes, 99.94 at.% 56Fe and 99.90 at.% 54Fe, were blended under gravimetric control to prepare ten synthetic isotope samples whose 56Fe isotope abundances ranged from 95% to 20%. For multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) measurements typical polyatomic interferences were removed by using Ar and H2 as collision gas and operating the MC-ICP-MS system in soft mode. Thus high-precision measurements of the Fe isotope abundance ratios were accomplished. Based on the measurement of the synthetic isotope abundance ratios by MC-ICP-MS, the correction factor for mass discrimination was calculated and the results were in agreement with results from IRMM014. The precision of all ten correction factors was 0.044%, indicating a good linearity of the MC-ICP-MS method for different isotope abundance ratio values. An isotopic reference material was certified under the same conditions as the instrument was calibrated. The uncertainties of ten correction factors K were calculated and the final extended uncertainties of the isotopic certified Fe reference material were 5.8363(37) at.% 54Fe, 91.7621(51) at.% 56Fe, 2.1219(23) at.% 57Fe, and 0.2797(32) at.% 58Fe.

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Traceability system for elemental analysis

Cited by 37 publications

References 5 publications

Isotope dilution mass spectrometry — A primary method of measurement and its role for RM certification

Isotope dilution mass spectrometry — A primary method of measurement and its role for RM certification

Isotope reference materials for present and future isotope research

Absolute measurements and certified reference material for iron isotopes using multiple‐collector inductively coupled mass spectrometry

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