The in-situ Sr isotope determination of low-Sr bioapatites is challenging and requires monitoring several interferences, among others, Ar-CaPO. In particular, the analysis of human bones and teeth has revealed several pitfalls, which affect the ability to obtain accurate results. In this commentary, I review the data from the paper of Meijer et al. (2019), trying to address some accuracy issues arising, in my opinion, from polyatomic interferences. After a tentative calibration of their data, using the 1/88Sr signal (V−1) as a proxy of the Sr content, the enamel specimens (enamel Ar-CaPO corrected 87Sr/86Sr ratio = 0.7078 ± 0.0032; mean ± 2σ) are closer to the likely local bioavailable Sr (bone Ar-CaPO corrected 87Sr/86Sr ratio = 0.7071 ± 0.0011; mean ± 2σ).
Accurate Sr isotope determination of human bone and tooth samples by LA-MC-ICP-MS: A comment on “Meijer et al., (2019)” / Lugli, F.. - In: INTERNATIONAL JOURNAL OF OSTEOARCHAEOLOGY. - ISSN 1047-482X. - 29:6(2019), pp. 1109-1111. [10.1002/oa.2795]
Accurate Sr isotope determination of human bone and tooth samples by LA-MC-ICP-MS: A comment on “Meijer et al., (2019)”
Lugli F.
2019
Abstract
The in-situ Sr isotope determination of low-Sr bioapatites is challenging and requires monitoring several interferences, among others, Ar-CaPO. In particular, the analysis of human bones and teeth has revealed several pitfalls, which affect the ability to obtain accurate results. In this commentary, I review the data from the paper of Meijer et al. (2019), trying to address some accuracy issues arising, in my opinion, from polyatomic interferences. After a tentative calibration of their data, using the 1/88Sr signal (V−1) as a proxy of the Sr content, the enamel specimens (enamel Ar-CaPO corrected 87Sr/86Sr ratio = 0.7078 ± 0.0032; mean ± 2σ) are closer to the likely local bioavailable Sr (bone Ar-CaPO corrected 87Sr/86Sr ratio = 0.7071 ± 0.0011; mean ± 2σ).
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