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Issue 7, 2016
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High-precision measurement of W isotopes in Fe–Ni alloy and the effects from the nuclear field shift

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Abstract

We present an analytical protocol for high-precision measurements of W isotopes by multi-collector ICPMS in metal alloy samples, with a particular emphasis on the least abundant W isotope (180W). The external reproducibility, based on replicate analysis of an NIST Fe–Ni steel (SRM 129c), for ε180W (6/4) is ± 0.49. This is an improvement of at least a factor of ≈2.4 compared to previous studies using MC-ICPMS. External precisions for other isotope ratios are comparable to previous studies of metallic samples. In addition, we observed resolvable deviations relative to the measurement reference standard (NIST SRM 3163) in isotope ratios that contain 183W. Similar effects have been reported in several previous studies of W isotopes. Our new data demonstrate that these effects are induced during chemical purification of W in the laboratory and that the isotopic variations are consistent with nuclear field shift effects. Such effects have been reported for various other elements but not yet for W. Possible bias introduced by this effect has implications for the use of W isotopes in early solar system chronology.

Graphical abstract: High-precision measurement of W isotopes in Fe–Ni alloy and the effects from the nuclear field shift

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Publication details

The article was received on 15 Jan 2016, accepted on 03 May 2016 and first published on 04 May 2016


Article type: Paper
DOI: 10.1039/C6JA00015K
J. Anal. At. Spectrom., 2016,31, 1400-1405

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    High-precision measurement of W isotopes in Fe–Ni alloy and the effects from the nuclear field shift

    D. L. Cook and M. Schönbächler, J. Anal. At. Spectrom., 2016, 31, 1400
    DOI: 10.1039/C6JA00015K

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