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NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis
Author(s) -
Weber Michael,
Lugli Federico,
Hattendorf Bodo,
Scholz Denis,
MertzKraus Regina,
Guinoiseau Damien,
Jochum Klaus Peter
Publication year - 2020
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12296
Subject(s) - carbonate , isotopes of strontium , strontium , isotope , strontium carbonate , chemistry , analytical chemistry (journal) , mineralogy , electron microprobe , radiochemistry , inductively coupled plasma mass spectrometry , in situ , mass fraction , mass spectrometry , environmental chemistry , chromatography , physics , organic chemistry , quantum mechanics
The in situ measurement of Sr isotopes in carbonates by MC‐ICP‐MS is limited by the availability of suitable microanalytical reference materials (RMs), which match the samples of interest. Whereas several well‐characterised carbonate reference materials for Sr mass fractions > 1000 µg g −1 are available, there is a lack of well‐characterised carbonate microanalytical RMs with lower Sr mass fractions. Here, we present a new synthetic carbonate nanopowder RM with a Sr mass fraction of ca. 500 µg g −1 suitable for microanalytical Sr isotope research (‘NanoSr’). NanoSr was analysed by both solution‐based and in situ techniques. Element mass fractions were determined using EPMA (Ca mass fraction), as well as laser ablation and solution ICP‐MS in different laboratories. The 87 Sr/ 86 Sr ratio was determined by well‐established bulk methods for Sr isotope measurements and is 0.70756 ± 0.00003 (2 s ). The Sr isotope microhomogeneity of the material was determined by LA‐MC‐ICP‐MS, which resulted in 87 Sr/ 86 Sr ratios of 0.70753 ± 0.00007 (2 s ) and 0.70757 ± 0.00006 (2 s ), respectively, in agreement with the solution data within uncertainties. Thus, this new reference material is well suited to monitor and correct microanalytical Sr isotope measurements of low‐Sr, low‐REE carbonate samples. NanoSr is available from the corresponding author.