Internal normalization techniques for high accuracy isotope dilution analyses.  Application to molybdenum and nickel in standard reference materials

Moore, L. J.; Machlan, L. A.; Shields, William R.; Garner, E. L.

doi:10.1021/ac60344a028

Cited by 61 publications

(33 citation statements)

References 17 publications

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“…Thus, A r (Te) is highly variable and this variability is dependent upon many factors, such as the amount of fissiogenic Te present, neutron capture reactions involving Te nuclei, and the migration (retention) of precursor nuclei. For example, the range reported for the ratio n(fission product 125,128,130 Te)/n(primordial Te) for Zone 9 at Oklo was 81 to 190 [138]. The maximum corresponds to a mole fraction of 130 Te of about 0.8 as compared to 0.34 found for the "normal" abundance.…”

Section: Copper (Cuprum)mentioning

confidence: 90%

“…For example, the range reported for the ratio n(fission product 125,128,130 Te)/n(primordial Te) for Zone 9 at Oklo was 81 to 190 [138]. The maximum corresponds to a mole fraction of 130 Te of about 0.8 as compared to 0.34 found for the "normal" abundance. Fission product Te isotopes increase A r (Te), so that A r (Te) is greater than 129.…”

Section: Copper (Cuprum)mentioning

confidence: 90%

“…The advent of multiple collector plasma source mass spectrometry [118] has improved the analytical precision of the isotopic analysis of Zn [119]. Maréchal Moore and others [130] have determined the absolute isotope abundances of Mo; however, absolute isotope-abundance determinations have not been made for any specimen used in relative isotope-abundance investigations. Multiple collector plasma source mass spectrometry [118] has improved the analytical precision of the isotopic analysis of Mo and demonstrated natural isotopic variation.…”

Section: Chromium 24 Crmentioning

confidence: 99%

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Isotope-abundance variations of selected elements (IUPAC Technical Report)

Coplen¹,

Böhlke²,

Bièvre³

et al. 2002

Pure and Applied Chemistry

428

360

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Documented variations in the isotopic compositions of some chemical elements are responsible for expanded uncertainties in the standard atomic weights published by the Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry. This report summarizes reported variations in the isotopic compositions of 20 elements that are due to physical and chemical fractionation processes (not due to radioactive decay) and their effects on the standard atomic-weight uncertainties. For 11 of those elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, silicon, sulfur, chlorine, copper, and selenium), standard atomic-weight uncertainties have been assigned values that are substantially larger than analytical uncertainties because of common isotope-abundance variations in materials of natural terrestrial origin. For 2 elements (chromium and thallium), recently reported isotope-abundance variations potentially are large enough to result in future expansion of their atomic-weight uncertainties. For 7 elements (magnesium, calcium, iron, zinc, molybdenum, palladium, and tellurium), documented isotope variations in materials of natural ter- restrial origin are too small to have a significant effect on their standard atomic-weight uncertainties. This compilation indicates the extent to which the atomic weight of an element in a given material may differ from the standard atomic weight of the element. For most elements given above, data are graphically illustrated by a diagram in which the materials are specified in the ordinate and the compositional ranges are plotted along the abscissa in scales of (1) atomic weight, (2) mole fraction of a selected isotope, and (3) delta value of a selected isotope ratio.

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Section: Copper (Cuprum)mentioning

confidence: 90%

Section: Copper (Cuprum)mentioning

confidence: 90%

Section: Chromium 24 Crmentioning

confidence: 99%

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Isotope-abundance variations of selected elements (IUPAC Technical Report)

Coplen¹,

Böhlke²,

Bièvre³

et al. 2002

Pure and Applied Chemistry

428

360

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“…This change leads to an increase in the uncertainty because of the application of accepted Commission guidelines. In addition, the previous value A r (Mo) = 95.94(1) from Moore et al [12] was derived from isotopic abundance data that was corrected to enable comparisons to earlier results [13] that were normalized to previous uncalibrated measurements from ref. [14].…”

Section: Molybdenummentioning

confidence: 99%

Atomic weights of the elements 2001 (IUPAC Technical Report)

Loss

2003

Pure and Applied Chemistry

115

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without thePresented are updated tables of the standard atomic weights and their uncertainties estimated by combining experimental uncertainties and terrestrial variabilities. In addition, this report again contains an updated table of relative atomicmass values and half-lives of selected radioisotopes. Changes in the evaluated isotope abundance values from those published in 1997 are relatively minor and will be published in a major review of each element in 2003.Many elements have a different isotopic composition in some nonterrestrial materials. Some recent data on parent nuclides that might affect isotope abundances or atomic-weight values are included in this report for the information of the interested scientific community.

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“…The average natural abundances of the stable isotopes of Mo as recommended by IUPAC, based on(Moore et al 1974). (Fig.…”

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confidence: 99%