NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

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 Christopher, Debra Ellisor, William 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
Pub Type
Journals

Download Paper

https://doi.org/10.1016/j.talanta.2021.122363
Local Download

Keywords

QQQ-ICP-MS, sulfur isotopes, strontium isotopes, salmon, food, reference materials
Uncertainty quantification, Reference materials, Food and nutrition and Analytical chemistry

Citation

Christopher, S. , Ellisor, D. and Davis, W. (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, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931170 (Accessed October 1, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created March 31, 2021, Updated September 29, 2025
Was this page helpful?