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Investigating the feasibility of ICP-MS/MS for differentiating NIST salmon reference materials through determination of Sr and S isotope ratios

Published

Author(s)

Steven J. Christopher, Debra Ellisor, Clay Davis

Abstract

The utility of triple quadrupole inductively coupled plasma mass spectrometry (QQQ-ICP-MS) was investigated for possible use in food authentication studies through the measurement of strontium and sulfur isotope ratios. Oxygen mass shift mode was applied to shift 87Sr/86Sr and 34S/32S isotope ratios to their respective oxides, 87Sr16O/86Sr16O and 34S16O/32S16O, effecting a gas-phase chemical separation of the elements from Rb and Kr (for Sr) and molecular N and O species, along with P- and S-hydrides (for S). A total least squares regression approach was utilized to generate the isotope ratio data from time-resolved analyses, and method uncertainties and accuracies were determined. The utility of the approach was shown by using the Sr and S isotope ratios together to discriminate between food safety and authentication reference materials NIST RM 8256 Wild-Caught Coho Salmon and NIST RM 8257 Aquacultured Coho Salmon that are currently under development at NIST.
Citation
Talanta

Keywords

QQQ-ICP-MS, sulfur isotopes, strontium isotopes, salmon, food, reference materials

Citation

Christopher, S. , Ellisor, D. and Davis, C. (2021), Investigating the feasibility of ICP-MS/MS for differentiating NIST salmon reference materials through determination of Sr and S isotope ratios, Talanta, [online], https://doi.org/10.1016/j.talanta.2021.122363 (Accessed April 18, 2024)
Created March 31, 2021, Updated February 10, 2023