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Preparation and characterization of a new reference standard GSB-Mg for Mg isotopic analysis

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Abstract

We have prepared a large volume of pure, concentrated and homogeneous magnesium standard solution (GSB-Mg) to be used as a secondary reference standard by the magnesium isotope community. This new standard solution can also be used for quality assurance, including the development and validation of analytical procedures, preparation and test of analytical methods, quality control and training of analysts. The δ26Mg values relative to DSM3, measured by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), are −2.038 ± 0.027‰ (n = 45, Lab 1), −2.024 ± 0.055‰ (n = 7, Lab 2), −2.078 ± 0.081‰ (n = 6, Lab 3), −2.037 ± 0.015‰ (n = 8, Lab 4), and −2.067 ± 0.039‰ (n = 12, Lab 5). The δ26Mg and δ25Mg values for the GSB-Mg standard solution are −2.049‰ and −1.056‰, with a combined expanded (k = 2) uncertainty of 0.049‰ and 0.028‰, respectively. These values show higher similarity to Mg isotopic compositions of carbonates and marine sediments compared to those of the mantle and crustal rocks, making the GSB-Mg solution a great reference material for Mg isotopic analysis of carbonates and marine sediments.

Graphical abstract: Preparation and characterization of a new reference standard GSB-Mg for Mg isotopic analysis

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Article information


Submitted
16 Feb 2020
Accepted
17 Mar 2020
First published
17 Mar 2020

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Technical Note

Preparation and characterization of a new reference standard GSB-Mg for Mg isotopic analysis

Z. Bao, K. Huang, J. Xu, L. Deng, S. Yang, P. Zhang and H. Yuan, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/D0JA00059K

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