Calibration of isotope amount ratios by analysis of isotope mixtures

Meija, Juris

doi:10.1007/s00216-012-5785-1

Cited by 33 publications

(25 citation statements)

References 28 publications

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“…41,42 Only recently, a comprehensive overview of the advantages and characteristics of gravimetric blending of isotopes as the primary calibration method for isotope amount ratios measurements was published. 43 Combining Internal and External Calibration Strategies Combining external and internal mass bias correction can set a promising alternative, combining the advantages of the two strategies and has also been presented for Sr isotope amount ratio analysis. In this case, Zr is added to samples where Sr isotope ratios are to be measured and the Zr isotope ratios are used to correct for the mass bias on Sr, still taking a bracketing standard (in this case NIST SRM 987 containing Zr as well) into consideration.…”

Section: External Calibration Of Isotope Amount Ratiosmentioning

confidence: 99%

Measurement Strategies

Irrgeher

Vogl

Santner

et al. 2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

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Designing an appropriate measurement strategy for a particular analytical question is not always obvious, since a number of factors have to be considered, whereby some of them might be difficult to define. A set of key questions generally precede the experimental design in analytical measurements and help to choose the measurement strategy, which is fit for the intended use -in the particular case of the content of this book -either for quantification, elemental ratio or isotope ratio analyses, accordingly.

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Section: External Calibration Of Isotope Amount Ratiosmentioning

confidence: 99%

Measurement Strategies

Irrgeher

Vogl

Santner

et al. 2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

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“…where N P ( i E) denotes the number of isotopes of mass number i of element E in material P. These isotopenumber ratios are usually measured by mass spectrometry, as the ratio of ion currents or detector counts, and preferably calibrated using a mixture of isotopes prepared gravimetrically [36]. However, laser spectrometry is an increasingly important technique for the measurement of isotopic ratios for the lighter elements [37].…”

Section: Definition and Realizationmentioning

confidence: 99%

Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)

Possolo

Veen

Meija

et al. 2018

Pure and Applied Chemistry

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Abstract:In 2009, the Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC) introduced the interval notation to express the standard atomic weights of elements whose isotopic composition varies significantly in nature. However, it has become apparent that additional guidance would be helpful on how representative values should be derived from these intervals, and on how the associated uncertainty should be characterized and propagated to cognate quantities, such as relative molecular masses. The assignment of suitable probability distributions to the atomic weight intervals is consistent with the CIAAW's goal of emphasizing the variability of the atomic weight values in nature. These distributions, however, are not intended to reflect the natural variability of the abundances of the different isotopes in the earth's crust or in any other environment. Rather, they convey states of knowledge about the elemental composition of "normal" materials generally, or about specific classes of such materials. In the absence of detailed knowledge about the isotopic composition of a material, or when such details may safely be ignored, the probability distribution assigned to the standard atomic weight intervals may be taken as rectangular (or, uniform). This modeling choice is a reasonable and convenient default choice when a representative value of the atomic weight, and associated uncertainty, are needed in calculations involving atomic and relative molecular masses. When information about the provenance of the material, or other information about the isotopic composition needs to be taken into account, then this distribution may be non-uniform. We present several examples of how the probability distribution of an atomic weight or relative molecular mass may be characterized, and also how it may be used to evaluate the associated uncertainty.

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“…Unfortunately, mass spectrometers yield signal intensity ratios that are related to the isotope ratios but are frequently biased due to inherent properties of the mass spectrometers (so-called mass bias). Therefore, the measured isotope ratios must be calibrated [6]. Determination of the calibration factors, and hence the absolute isotope ratios, is best achieved using gravimetrically prepared mixtures of at least two distinct isotopically enriched materials [7].…”

Section: Meet the Challengementioning

confidence: 99%