A natural calcite reference material for microbeam Sr isotope analysis. Issue 2 (19th December 2022)

• Record Type: Journal Article
• Authors: Liang, Peng; Bao, Zhian; Yang, Wenqiang; Zong, Chunlei; Chen, Kaiyun; Zhang, Yan; Yuan, Honglin
• Is Part Of: Journal of analytical atomic spectrometry. Volume 38:Issue 2(2023)
• Page Start: 414
• Page End: 421
• Publication Date: 2022-12-19
• Subjects: Atomic spectra -- Periodicals; Atomic absorption spectroscopy -- Periodicals; 543.0858
• DOI: 10.1039/d2ja00311b
• Languages: English
• ISSNs: 0267-9477

Abstract

Abstract : A natural calcite sample MNP is prepared as a potential reference material for in situ Sr isotope analysis. Abstract : High-quality Sr isotope data are critically dependent on the quality of reference materials that are used for instrumental calibration and data monitoring during laser ablation (LA) multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) analysis. We have prepared a new natural calcite reference material MNP for in situ Sr isotope measurement by LA-MC-ICP-MS. Detailed textural examination and major element determination suggest that the MNP calcite reference material has no growth rim or zoning. Trace element analyses by LA-ICP-MS showed that the MNP calcite reference material has low Rb/Sr ratios, low amounts of heavy rare earth elements (HREEs) and high Sr contents. The MNP calcite reference material is homogeneous with respect to Sr isotopes based on a large number of measurements performed by single-grain solution nebulizer (SN)-MC-ICP-MS and LA-MC-ICP-MS. The traditional bulk isotope analyses by TIMS and SN-MC-ICP-MS yielded a mean 87 Sr/ 86 Sr ratio of 0.70617 ± 0.00005(2SD, n = 18). A total of 585 LA-MC-ICP-MS Sr isotope analyses on random calcite crystals show homogeneous Sr isotopic compositions with an average 87 Sr/ 86 Sr ratio of 0.70617 ± 0.00005 (2SD), identical with the solution-based data. These suggest that MNP calcite can be used as a potential reference material for microbeam Sr isotopic analysis.