Investigation of the crucial factors affecting accurate measurement of strontium isotope ratios by total evaporation thermal ionization mass spectrometry

Song, Weijie; Wang, Jun; Lu, Hai; Fang, Xiang; Song, Pengcheng

doi:10.1002/rcm.8410

Cited by 8 publications

(9 citation statements)

References 34 publications

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“…The isotope ratios of the enriched materials were then measured with a well‐conditioned TE‐TIMS technique (Wang et al . 2019). Weighing data also have been corrected for feasible non‐stoichiometry of the weighed element species.…”

Section: Methodsmentioning

confidence: 99%

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Development and Certification of Synthetic Zinc Isotopic Reference Materials

Wang

Zhou

et al. 2020

Geostandard Geoanalytic Res

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The development, uncertainty evaluation and certification of eleven newly developed zinc isotope ratio reference materials (GBW04465‐04475) are described. The reference materials were gravimetrically prepared with enriched isotopic materials. During the certification, calibrated MC‐ICP‐MS measrements were performed. The improved techniques for certification in this study are as follows: (a) the isotopic compositions of purified enriched isotopes used for preparation of synthetic isotopic mixtures were obtained by total evaporation‐TIMS instead of the traditional iteration method; and (b) the mass discrimination effect in MC‐ICP‐MS was investigated through a series of isotopic mixtures with a wide range of isotopic compositions, and a non‐linearity effect of K factors was observed, and a new correction proposal was employed. The reference materials were certified with a point‐to‐point proposal instead of the traditional mean and stable K method. Further, the uncertainties were evaluated in detail, and contributions from characterisation, homogeneity and long‐term stability were taken into consideration. Among them, contributions from characterisation were particularly detailed: any budgets, for example, weighing and impurity checking, were clearly addressed, and the combined uncertainties were derived by a mathematical differentiation method. In addition, the traceability chain was established, directly pointing to the SI unit, the mole, and a between‐laboratory comparison was carried out to validate the reference values.

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Section: Methodsmentioning

confidence: 99%

“…2006, Wakaki and Shibata 2007, Wang et al . 2019), which should provide accurately determined results for isotope ratios without any correction. (c) The evaluation of uncertainties needs to be improved, and all contributions including characterisation, homogeneity and stability need to be involved.…”

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confidence: 99%

Development and Certification of Synthetic Zinc Isotopic Reference Materials

Wang

Zhou

et al. 2020

Geostandard Geoanalytic Res

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“…The surface ionization process is governed by the Saha–Langmuir equation which describes the dependence of the degree of ionization of molecules on the temperature and work function of the surface as well as on the ionization energy of the treated molecule. In our ion source the ionizer filament is made of material of high work function, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…This is a reason why thermal ionization mass spectrometry (TIMS) is a convenient method for the precise measurement of Li and K isotope ratios. The TIMS method can also be applied to the ionization of several other compounds and atoms in both, positive and negative modes …”

Section: Introductionmentioning

confidence: 99%

“…The TIMS method can also be applied to the ionization of several other compounds and atoms in both, positive and negative modes. [1][2][3][4][5][6][7][8] Lithium is an exceptional element for many reasons. First of all, it is the lightest solid element and one of the very rare elements where the lighter isotope is less abundant than the heavier one.…”

Section: Introductionmentioning

confidence: 99%

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Improved three‐filament thermal ionization mass spectrometry ion source for isotope ratio determination of two samples

Pacek

Pieńkos

Czarnacki

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale In order to make a single‐filament thermal ionization mass spectrometry (TIMS) instrument more versatile and efficient in element isotope analysis, a multifilament ion source has to be employed. In the currently used three‐filament ion sources, the same sample must be loaded on all the evaporator filaments, because of the possibility of cross‐contamination. Methods The elimination of cross‐contamination in a TIMS three‐filament ion source was achieved by installation of a wide ionizer filament (ribbon shape) perpendicular to the extracting slit plane between two parallel evaporators. In such a configuration, the ionizer filament serves also as a screen separating two evaporator filaments on which two different samples can be loaded. Results The lack of cross‐contamination (on a measurement uncertainty 1σ level of 0.3‰) has been demonstrated by measurements of the isotope ratios of a potassium chloride sample (39K/41K = 13.7801 ± 0.0023) versus a spike (39K/41K = 1.5670 ± 0.0003). The reproducibility of the isotope ratios for potassium 41K/39K and lithium 7Li/6Li is about 600 ppm (1σ). Conclusions The small change of the ionizer filament configuration significantly improves the functionality of the ion source. The proposed modification enables us to perform alternating isotope analyses under the same working conditions for two different samples (e.g. studied sample and standard).

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