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Memory Effect as a Source of Abnormal Uncertainty in the Sr Isotope Analysis by the Double Spike Technique

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Abstract

This article discusses the reasons for the poor reproducibility of the 44Ca/42Ca and 88Sr/86Sr isotope ratios measured by double spike isotope dilution techniques. It was found that the heterogeneous evaporation of a sample from an ion source filament is not the main reason for the poor reproducibility. It was demonstrated that the observed discrepancy between the predicted and experimental data can be explained by the memory effect rather than by the heterogeneous evaporation effect. The similarities between these effects, occurring in thermal ionization ion sources, were discussed as well. It was shown that the replacement of a single-filament ion source with a double-filament source ensures a decrease in the memory effect and the improvement of the precision of the 88Sr/86Sr measurement by a factor of more than two: from ±0.037‰ to ±0.013‰. At the same time, the measured values of 87Sr/86Sr in SRM987 were always within the 0.710250 ± 0.000009 value.

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ACKNOWLEDGMENTS

The author is grateful to B.M. Gorokhovskii, V.P. Kovach, and A.B. Kotov for their efforts on the maintenance of IPGG RAS mass spectrometers and also to I.M. Gorokhov and A.B. Kuznetsov for constructive critics of the manuscript.

Funding

This work was supported by the Russian Science Foundation, project no. 18-17-00247.

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Authors and Affiliations

  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    A. Yu. Kramchaninov

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  1. A. Yu. Kramchaninov
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Correspondence to A. Yu. Kramchaninov.

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Translated by E. Rykova

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Kramchaninov, A.Y. Memory Effect as a Source of Abnormal Uncertainty in the Sr Isotope Analysis by the Double Spike Technique. J Anal Chem 76, 1549–1557 (2021). https://doi.org/10.1134/S1061934821130062

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  • DOI: https://doi.org/10.1134/S1061934821130062

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