Determination of Mg isotope ratios without column chromatography for carbonates using sulphuric acid and MC-ICP-MS,Journal of Analytical Atomic Spectrometry

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Determination of Mg isotope ratios without column chromatography for carbonates using sulphuric acid and MC-ICP-MS
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2019-10-25 , DOI: 10.1039/c9ja00295b
Zhian Bao _{1,

2,

3,

4,

5} , Chunlei Zong _{1,

2,

3,

4,

5} , Kangjun Huang _{1,

2,

3,

4,

5} , Kaiyun Chen _{1,

2,

3,

4,

5} , Nan Lv _{1,

2,

3,

4,

5} , Honglin Yuan _{1,

2,

3,

4,

5}

Affiliation

This study presents a practical method for high-precision Mg isotope determination without column chromatography for carbonate samples using sulphuric acid and MC-ICP-MS. The protocol uses the chemical reaction between carbonates and sulphuric acid to generate a CaSO₄ precipitate and MgSO₄ supernatant, which are used to determine Mg isotopic ratios. The matrix effects and the sulphuric acid conditions were rigorously examined using a Nu Plasma II in wet plasma mode. The precision and accuracy of this method were tested by measurements of the carbonite standard material JDo-1 over four months. The δ²⁶Mg of JDo-1 is −2.32 ± 0.11‰ (2SD, n = 34) relative to DSM3, well consistent with the recommended value (−2.35 ± 0.15‰). The robustness of this method was further assessed by replicated analyses of ten Chinese carbonate reference materials that covered a large range of MgO contents from 5.98 wt% to 20.91 wt%.

更新日期：2019-10-25

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