Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements

Albert Galy, Olga Yoffe, Philip E. Janney, Ross W. Williams, Christophe Cloquet, Olivier Alard, Ludwik Halicz, Meenakshi Wadhwa, Ian D. Hutcheon, Erick Ramon, Jean Carignan

Research output: Contribution to journalArticle

265 Citations (Scopus)

Abstract

Multicollector ICP-MS has been used for the precise measurement of variations in the isotopic composition of the isotopic standard of magnesium (SRM980) provided by the National Institute of Standards and Technology (Gaithersburg, MD, USA). The SRM980 consists of metal chips weighing between 1 and 50 mg and each unit delivered by the National Institute of Standards and Technology corresponds to a bottle containing about 0.3 g. Height units were analysed. Variations in sample 25Mg/24Mg, and 26Mg/24Mg ratios are expressed as δ25Mg and δ26Mg units, respectively, which are deviations in parts per 103 from the same ratio in a standard solution. The differences in δ25Mg and δ26Mg of the SRM980 are up to 4.20 and 8.19%, respectively, while the long-term repeatability of δ5Mg and δ26Mg are 0.09 and 0.16%, respectively, at 95% confidence. However, when plotted in a three-isotope diagram, all the data fall on a single mass fractionation line. Overall limits of error of the SRM980 reported here fall within the previously reported overall limits of error. The isotopic heterogeneity not only corresponds to differences among units but has been found at the chip-size level. This result, due to the precision of the MC-ICP-MS technique, makes the SRM980 inappropriate for the international isotopic standard of magnesium. The SRM980 can still be used to report the excess of 26Mg, which is defined by the deviation from the mass-dependent relationship between 25Mg/24Mg, and 26Mg/24Mg ratios. Two large batches (around 10 g of Mg in each) of pure Mg solutions (in 0.3 M HNO3) have been prepared and characterised. These 2 solutions (DSM3 and Cambridge 1) are suitable reference material because they are immune to heterogeneity. DSM3 and Cambridge 1 are isotopically different (by 1.3% per u) and are available upon request from the first author. In addition, DSM3 has an isotopic composition very similar to the Mg-isotopic composition of carbonaceous chondrites (Orgueil and Allende). Because of the lack of heterogeneity and the cosmochemical and geochemical significance of DSM3, we urge the use of DSM3 as the primary isotopic reference material to report Mg-isotopic variations.

Original languageEnglish (US)
Pages (from-to)1352-1356
Number of pages5
JournalJournal of Analytical Atomic Spectrometry
Volume18
Issue number11
DOIs
StatePublished - 2003
Externally publishedYes

Fingerprint

Isotopes
Magnesium
Chemical analysis
Bottles
Weighing
Fractionation
Metals

ASJC Scopus subject areas

  • Spectroscopy

Cite this

Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements. / Galy, Albert; Yoffe, Olga; Janney, Philip E.; Williams, Ross W.; Cloquet, Christophe; Alard, Olivier; Halicz, Ludwik; Wadhwa, Meenakshi; Hutcheon, Ian D.; Ramon, Erick; Carignan, Jean.

In: Journal of Analytical Atomic Spectrometry, Vol. 18, No. 11, 2003, p. 1352-1356.

Research output: Contribution to journalArticle

Galy, A, Yoffe, O, Janney, PE, Williams, RW, Cloquet, C, Alard, O, Halicz, L, Wadhwa, M, Hutcheon, ID, Ramon, E & Carignan, J 2003, 'Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements', Journal of Analytical Atomic Spectrometry, vol. 18, no. 11, pp. 1352-1356. https://doi.org/10.1039/b309273a
Galy, Albert ; Yoffe, Olga ; Janney, Philip E. ; Williams, Ross W. ; Cloquet, Christophe ; Alard, Olivier ; Halicz, Ludwik ; Wadhwa, Meenakshi ; Hutcheon, Ian D. ; Ramon, Erick ; Carignan, Jean. / Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements. In: Journal of Analytical Atomic Spectrometry. 2003 ; Vol. 18, No. 11. pp. 1352-1356.
@article{46c446252de6456386375f02b807a9c2,
title = "Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements",
abstract = "Multicollector ICP-MS has been used for the precise measurement of variations in the isotopic composition of the isotopic standard of magnesium (SRM980) provided by the National Institute of Standards and Technology (Gaithersburg, MD, USA). The SRM980 consists of metal chips weighing between 1 and 50 mg and each unit delivered by the National Institute of Standards and Technology corresponds to a bottle containing about 0.3 g. Height units were analysed. Variations in sample 25Mg/24Mg, and 26Mg/24Mg ratios are expressed as δ25Mg and δ26Mg units, respectively, which are deviations in parts per 103 from the same ratio in a standard solution. The differences in δ25Mg and δ26Mg of the SRM980 are up to 4.20 and 8.19{\%}, respectively, while the long-term repeatability of δ5Mg and δ26Mg are 0.09 and 0.16{\%}, respectively, at 95{\%} confidence. However, when plotted in a three-isotope diagram, all the data fall on a single mass fractionation line. Overall limits of error of the SRM980 reported here fall within the previously reported overall limits of error. The isotopic heterogeneity not only corresponds to differences among units but has been found at the chip-size level. This result, due to the precision of the MC-ICP-MS technique, makes the SRM980 inappropriate for the international isotopic standard of magnesium. The SRM980 can still be used to report the excess of 26Mg, which is defined by the deviation from the mass-dependent relationship between 25Mg/24Mg, and 26Mg/24Mg ratios. Two large batches (around 10 g of Mg in each) of pure Mg solutions (in 0.3 M HNO3) have been prepared and characterised. These 2 solutions (DSM3 and Cambridge 1) are suitable reference material because they are immune to heterogeneity. DSM3 and Cambridge 1 are isotopically different (by 1.3{\%} per u) and are available upon request from the first author. In addition, DSM3 has an isotopic composition very similar to the Mg-isotopic composition of carbonaceous chondrites (Orgueil and Allende). Because of the lack of heterogeneity and the cosmochemical and geochemical significance of DSM3, we urge the use of DSM3 as the primary isotopic reference material to report Mg-isotopic variations.",
author = "Albert Galy and Olga Yoffe and Janney, {Philip E.} and Williams, {Ross W.} and Christophe Cloquet and Olivier Alard and Ludwik Halicz and Meenakshi Wadhwa and Hutcheon, {Ian D.} and Erick Ramon and Jean Carignan",
year = "2003",
doi = "10.1039/b309273a",
language = "English (US)",
volume = "18",
pages = "1352--1356",
journal = "Journal of Analytical Atomic Spectrometry",
issn = "0267-9477",
publisher = "Royal Society of Chemistry",
number = "11",

}

TY - JOUR

T1 - Magnesium isotope heterogeneity of the isotopic standard SRM980 and new reference materials for magnesium-isotope-ratio measurements

AU - Galy, Albert

AU - Yoffe, Olga

AU - Janney, Philip E.

AU - Williams, Ross W.

AU - Cloquet, Christophe

AU - Alard, Olivier

AU - Halicz, Ludwik

AU - Wadhwa, Meenakshi

AU - Hutcheon, Ian D.

AU - Ramon, Erick

AU - Carignan, Jean

PY - 2003

Y1 - 2003

N2 - Multicollector ICP-MS has been used for the precise measurement of variations in the isotopic composition of the isotopic standard of magnesium (SRM980) provided by the National Institute of Standards and Technology (Gaithersburg, MD, USA). The SRM980 consists of metal chips weighing between 1 and 50 mg and each unit delivered by the National Institute of Standards and Technology corresponds to a bottle containing about 0.3 g. Height units were analysed. Variations in sample 25Mg/24Mg, and 26Mg/24Mg ratios are expressed as δ25Mg and δ26Mg units, respectively, which are deviations in parts per 103 from the same ratio in a standard solution. The differences in δ25Mg and δ26Mg of the SRM980 are up to 4.20 and 8.19%, respectively, while the long-term repeatability of δ5Mg and δ26Mg are 0.09 and 0.16%, respectively, at 95% confidence. However, when plotted in a three-isotope diagram, all the data fall on a single mass fractionation line. Overall limits of error of the SRM980 reported here fall within the previously reported overall limits of error. The isotopic heterogeneity not only corresponds to differences among units but has been found at the chip-size level. This result, due to the precision of the MC-ICP-MS technique, makes the SRM980 inappropriate for the international isotopic standard of magnesium. The SRM980 can still be used to report the excess of 26Mg, which is defined by the deviation from the mass-dependent relationship between 25Mg/24Mg, and 26Mg/24Mg ratios. Two large batches (around 10 g of Mg in each) of pure Mg solutions (in 0.3 M HNO3) have been prepared and characterised. These 2 solutions (DSM3 and Cambridge 1) are suitable reference material because they are immune to heterogeneity. DSM3 and Cambridge 1 are isotopically different (by 1.3% per u) and are available upon request from the first author. In addition, DSM3 has an isotopic composition very similar to the Mg-isotopic composition of carbonaceous chondrites (Orgueil and Allende). Because of the lack of heterogeneity and the cosmochemical and geochemical significance of DSM3, we urge the use of DSM3 as the primary isotopic reference material to report Mg-isotopic variations.

AB - Multicollector ICP-MS has been used for the precise measurement of variations in the isotopic composition of the isotopic standard of magnesium (SRM980) provided by the National Institute of Standards and Technology (Gaithersburg, MD, USA). The SRM980 consists of metal chips weighing between 1 and 50 mg and each unit delivered by the National Institute of Standards and Technology corresponds to a bottle containing about 0.3 g. Height units were analysed. Variations in sample 25Mg/24Mg, and 26Mg/24Mg ratios are expressed as δ25Mg and δ26Mg units, respectively, which are deviations in parts per 103 from the same ratio in a standard solution. The differences in δ25Mg and δ26Mg of the SRM980 are up to 4.20 and 8.19%, respectively, while the long-term repeatability of δ5Mg and δ26Mg are 0.09 and 0.16%, respectively, at 95% confidence. However, when plotted in a three-isotope diagram, all the data fall on a single mass fractionation line. Overall limits of error of the SRM980 reported here fall within the previously reported overall limits of error. The isotopic heterogeneity not only corresponds to differences among units but has been found at the chip-size level. This result, due to the precision of the MC-ICP-MS technique, makes the SRM980 inappropriate for the international isotopic standard of magnesium. The SRM980 can still be used to report the excess of 26Mg, which is defined by the deviation from the mass-dependent relationship between 25Mg/24Mg, and 26Mg/24Mg ratios. Two large batches (around 10 g of Mg in each) of pure Mg solutions (in 0.3 M HNO3) have been prepared and characterised. These 2 solutions (DSM3 and Cambridge 1) are suitable reference material because they are immune to heterogeneity. DSM3 and Cambridge 1 are isotopically different (by 1.3% per u) and are available upon request from the first author. In addition, DSM3 has an isotopic composition very similar to the Mg-isotopic composition of carbonaceous chondrites (Orgueil and Allende). Because of the lack of heterogeneity and the cosmochemical and geochemical significance of DSM3, we urge the use of DSM3 as the primary isotopic reference material to report Mg-isotopic variations.

UR - http://www.scopus.com/inward/record.url?scp=0344099115&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0344099115&partnerID=8YFLogxK

U2 - 10.1039/b309273a

DO - 10.1039/b309273a

M3 - Article

VL - 18

SP - 1352

EP - 1356

JO - Journal of Analytical Atomic Spectrometry

JF - Journal of Analytical Atomic Spectrometry

SN - 0267-9477

IS - 11

ER -