The combined measurement of 87Sr/86Sr isotope ratios and 88Sr/85Rb elemental ratios using laser ablation MC-ICP-MS and its application for food provenance studies: the case for Asturian beans

Abstract

The spectral interference of ⁸⁷Rb on ⁸⁷Sr for the measurement of ⁸⁷Sr/⁸⁶Sr isotope ratios in solid samples by laser ablation multicollector (MC)-ICP-MS could be corrected by combining the transient signal of the sample with a Rb pulse from the nebulisation of a pure Rb standard. This dual sample introduction system, combined with a multiple linear regression data treatment procedure, allowed the interference free measurement of the ⁸⁷Sr/⁸⁶Sr isotope ratio in solid samples. Additionally, when the signals for Rb and Sr could be separated in time, even only partially, the application of the multiple linear regression procedure allowed us to compute also the ⁸⁷Sr/⁸⁶Sr isotope ratio free of spectral interference. The fact that Sr was concentrated in the seed coat of beans, whereas Rb was mainly present in the cotyledon, allowed us to develop a laser ablation multicollector ICP-MS procedure for the authentication of Asturian beans which are subject to fraud with the import of South American beans. By combining the ⁸⁷Sr/⁸⁶Sr isotope ratio with the ⁸⁸Sr/⁸⁵Rb elemental ratio we were able to distinguish between Asturian and South American beans in spite of the large ⁸⁷Sr/⁸⁶Sr isotopic variability of Asturian beans.