Inter-Calibration of a Proposed New Primary Reference Standard AA-ETH Zn for Zinc Isotopic Analysis

Corey Archer, Morten B. Anderson, Christophe Cloquet, Tim M. Conway, Shoufei Dong, Michael Ellwood, Rebekah Moore, Joey Nelson, Mark Rehkamper

Research output: Contribution to journalArticlepeer-review

Abstract

We have prepared a large volume of pure, concentrated and homogenous zinc standard solution. This new standard solution is intended to be used as a primary reference standard for the zinc isotope community, and to serve as a replacement for the nearly exhausted current reference standard, the so-called JMC-Lyon Zn. The isotopic composition of this new zinc standard (AA-ETH Zn) has been determined through an inter-laboratory calibration exercise, calibrated against the existing JMC-Lyon standard, as well as the certified Zn reference standard IRMM-3702. The data show that the new standard is isotopically indistinguishable from the IRMM-3702 zinc standard, with a weighted δ 66/64 Zn value of 0.28 ± 0.02‰ relative to JMC-Lyon. We suggest that this new standard be assigned a δ 66/64 Zn value of +0.28‰ for reporting of future Zn isotope data, with the rationale that all existing published Zn isotope data are presented relative to the JMC-Lyon standard. Therefore our proposed presentation allows for a direct comparison with all previously published data, and that are directly traceable to a certified reference standard, IRMM-3702 Zn. This standard will be made freely available to all interested labs through contact with the corresponding author.

Original languageAmerican English
JournalJournal of Analytical Atomic Spectrometry
Volume32
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Disciplines

  • Earth Sciences

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