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Obtaining Accurate Isotopic Compositions with the Double Spike Technique: Practical Considerations

Research output: Contribution to journalReview article

Original languageEnglish
Pages (from-to)5-22
Number of pages18
JournalGeostandards and Geoanalytical Research
Volume43
Issue number1
Early online date22 Dec 2018
DOIs
DateAccepted/In press - 6 Nov 2018
DateE-pub ahead of print - 22 Dec 2018
DatePublished (current) - 1 Mar 2019

Abstract

Ever‐increasing precision in isotope ratio measurements requires a concomitant small bias and minimisation of inter‐laboratory bias. The double spike technique is the most suitable method to obtain reliable isotope composition data that are accurately corrected for instrumental mass fractionation. Compared with other methods, such as sample‐calibrator bracketing, only the double spike technique can correct for all sources of fractionation after equilibration of the sample with the double spike, such as that incurred during chemical separation and measurement. In addition, it is not dependent on a priori assumptions of perfect matrix matching of samples to reference materials or quantitative recovery of the sample through the chemical separation procedure to yield accurate results. In this review article, we present a detailed discussion of the merits of the double spike technique, how to design and calibrate a suitable double spike and analytical strategies. Our objective is to offer a step‐by‐step introduction to the use of the double spike technique in order to lower potential barriers that researchers new to the subject might face, such that double spiking will replace sample‐calibrator bracketing as the measurement method of choice.

    Research areas

  • double spike method, instrumental mass fractionation, mass-dependent isotope variation, spike calibration, measurement procedure optimisation

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  • Full-text PDF (accepted author manuscript)

    Rights statement: his is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at https://onlinelibrary.wiley.com/doi/full/10.1111/ggr.12248 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 471 KB, PDF document

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