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Testing miniaturized extraction chromatography protocols for combined 87Sr/86Sr and δ88/86Sr analyses of pore water by MC-ICP-MS
Limnology and Oceanography: Methods ( IF 2.7 ) Pub Date : 2021-05-04 , DOI: 10.1002/lom3.10435
Claudio Argentino 1 , Federico Lugli 2, 3 , Anna Cipriani 3, 4 , Giuliana Panieri 1
Affiliation  

We tested two miniaturized extraction chromatography protocols for strontium isolation based on 300 μL (Protocol 1) and 30 μL (Protocol 2) column volumes of Sr-Spec resin, for the simultaneous determination of 87Sr/86Sr and δ88/86Sr 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 87Sr/86Sr and δ88/86Sr 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 87Sr/86Sr = 0.708790 ± 0.000062 and δ88/86Sr = 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 87Sr/86Sr ratios and allow the detection of natural variations in δ88/86Sr 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.

中文翻译:

使用 MC-ICP-MS 对孔隙水进行 87Sr/86Sr 和 δ88/86Sr 组合分析的微型萃取色谱方案测试

我们测试了基于300为锶隔离2个小型化的萃取层析协议 μ L(方案1)和30  μ L(方案2)的Sr-规格树脂的柱体积,用于同时测定87 SR / 86 Sr和δ 86分之88通过 MC-ICP-MS 测定 Sr。通过分析 JCt-1 和 SRM 1640a 参考材料评估了 Sr 同位素比率的准确度和精密度,结果87 Sr/ 86 Sr 和δ 88/86 Sr 值的重现性为 0.000026 和 0.04‰(方案 1)( 2SD, n  = 3), 以及 0.000074 和 0.13‰ (Protocol 2) (2SD, n = 4),分别。此处首次展示的 SRM 1640a 的 Sr 同位素组成为87 Sr/ 86 Sr = 0.708790 ± 0.000062 和δ 88/86 Sr = 0.07 ± 0.10‰(2SD,n  = 6)。方案 1 和方案 2 已成功应用于从巴伦支海北部海洋沉积物岩心中提取的孔隙水。我们的结果表明,这两种方案都达到了准确的87 Sr/ 86 Sr 比率,并允许检测海洋孔隙水中δ 88/86 Sr的自然变化。与之前的 Sr/基质分离方法相比,Protocol 2 的成本显着降低,使其特别适用于大规模海洋学和湖沼学研究。
更新日期:2021-06-17
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