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Determining high-precision Sr-Nd isotopic ratios of certified reference materials using thermal ionization mass spectrometry

The Thermal Ionization Mass Spectrometry (TIMS) Laboratory at CSIR-National Geophysical Research Institute, Telangana, Hyderabad, India (CSIR-NGRI) has undertaken a systematic analysis of the isotopic (Sr and Nd) compositions of the eight most frequently used certified reference materials (CRMs) use...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 2024-07, Vol.39 (8), p.2129-2138
Main Authors: Shankar, Ravi, Sarma, Drona S, Panda, Aurovinda, Panicker, Arathi G, Augustine, Sminto
Format: Article
Language:English
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Summary:The Thermal Ionization Mass Spectrometry (TIMS) Laboratory at CSIR-National Geophysical Research Institute, Telangana, Hyderabad, India (CSIR-NGRI) has undertaken a systematic analysis of the isotopic (Sr and Nd) compositions of the eight most frequently used certified reference materials (CRMs) used for in-house geochemical analyses. This investigation improves upon the existing database for the isotopic community. This study uses a two-step Sr-Nd separation procedure to purify Sr and Nd from the geological sample chemically digested using a modified HF-HNO 3 -HCl scheme. The replicate analyses of SRM 987 and La Jolla yielded an 87 Sr/ 86 Sr ratio of 0.710246 ± 0.000006 ( n = 8, 2SD) and an average 143 Nd/ 144 Nd ratio of 0.511844 ± 0.000008 ( n = 8, 2SD) which agrees with the well-accepted value of 0.710245 ± 0.000003 and 0.511846 ± 0.000002 respectively. We report precise Sr-Nd isotopic compositions of CRMs with the 2SD of the mean of the Sr-Nd isotope analysis, always less than or equal to 10. This study presents a procedure for purifying Sr and Nd using ion exchange/extraction column chromatography. The Sr-Nd isotopic compositions of CRMs in this study match well with the published literature. We report the first precise and reliable Sr-Nd isotope data for STM-1 using ion exchange column chromatography and TIMS. Analyses of STM-1 yielded a mean 87 Sr/ 86 Sr ratio of 0.703744 ± 0.000010 ( n = 9, 2SD) and a mean 143 Nd/ 144 Nd ratio of 0.512925 ± 0.000004 ( n = 12, 2SD). This is the first report of Sr-Nd isotope ratios of STM-1 determined using TIMS.
ISSN:0267-9477
1364-5544
DOI:10.1039/d4ja00162a