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Testing miniaturized extraction chromatography protocols for combined 87 Sr / 86 Sr and δ 88/ 86 Sr analyses of pore water by MC‐ICP‐MS
Author(s) -
Argentino Claudio,
Lugli Federico,
Cipriani Anna,
Panieri Giuliana
Publication year - 2021
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.1002/lom3.10435
Subject(s) - strontium , isotopes of strontium , reproducibility , chemistry , extraction (chemistry) , analytical chemistry (journal) , isotope , chromatography , radiochemistry , physics , organic chemistry , quantum mechanics
We tested two miniaturized extraction chromatography protocols for strontium isolation based on 300 μ L (Protocol 1) and 30 μ L (Protocol 2) column volumes of Sr‐Spec resin, for the simultaneous determination of 87 Sr/ 86 Sr and δ 88/86 Sr by MC‐ICP‐MS. The accuracy and precision of the Sr isotope ratios have been evaluated by analyzing JCt‐1 and SRM 1640a reference materials, resulting in a reproducibility of 87 Sr/ 86 Sr and δ 88/86 Sr values of 0.000026 and 0.04‰ (Protocol 1) (2SD, n = 3), and of 0.000074 and 0.13‰ (Protocol 2) (2SD, n = 4), respectively. The Sr isotopic composition of SRM 1640a, presented here for the first time, is 87 Sr/ 86 Sr = 0.708790 ± 0.000062 and δ 88/86 Sr = 0.07 ± 0.10‰ (2SD, n = 6). Protocols 1 and 2 were successfully applied to pore waters extracted from marine sediment cores from the northern Barents Sea. Our results demonstrate that both protocols attain accurate 87 Sr/ 86 Sr ratios and allow the detection of natural variations in δ 88/86 Sr in marine pore waters. Compared to previous Sr/matrix separation methods, Protocol 2 is significantly less costly, making it particularly suitable for large‐scale oceanological and limnological studies.