University Of Tasmania

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A common reference material for cadmium isotope studies -- NIST SRM 3108

journal contribution
posted on 2023-05-19, 17:05 authored by Abouchami, W, Galer, SJG, Horner, TJ, Rehkamper, M, Wombacher, F, Xue, Z, Lambelet, M, Melanie EastMelanie East, Stirling, CH, Schonbachler, M, Shiel, AE, Weis, D, Holdship, PF
Research into natural mass‐dependent stable isotope fractionation of cadmium has rapidly expanded in the past few years. Methodologies are diverse with MC‐ICP‐MS favoured by all but one laboratory, which uses thermal ionisation mass spectrometry (TIMS). To quantify the isotope fractionation and correct for instrumental mass bias, double‐spike techniques, sample‐calibrator bracketing or element doping has been used. However, easy comparison between data sets has been hampered by the multitude of in‐house Cd solutions used as zero‐delta reference in different laboratories. The lack of a suitable isotopic reference material for Cd is detrimental for progress in the long term. We have conducted a comprehensive round‐robin assay of NIST SRM 3108 and the Cd isotope offsets to commonly used in‐house reference materials. Here, we advocate NIST SRM 3108 both as an isotope standard and the isotopic reference point for Cd and encourage its use as ‘zero‐delta’ in future studies. The purity of NIST SRM 3108 was evaluated regarding isobaric and polyatomic molecular interferences, and the levels of Zn, Pd and Sn found were not significant. The isotope ratio 114Cd/110Cd for NIST SRM 3108 lies within ∼ 10 ppm Da−1 of best estimates for the Bulk Silicate Earth and is validated for all measurement technologies currently in use.


Publication title

Geostandards and Geoanalytical Research








Institute for Marine and Antarctic Studies


Wiley-Blackwell Publishing Inc.

Place of publication

United States

Rights statement

Copyright 2012 The Authors. Geostandards and Geoanalytical Research Copyright 2012 International Association of Geoanalysts

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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