Applying standard addition to determine antimony isotopes in low-Sb samples using HG-MC-ICP-MS†

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Honggang Zhu, Jian-Ming Zhu, Decan Tan, Zhuo Lu, Hongfei Liao and Yiwei Ma
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Abstract

The standard addition (SA) method has been successfully employed in measuring metal-stable isotopes in recent years. Here, utilizing hydride generator (HG)-multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS, Nu Plasma II and Neptune Plus), we evaluated the method's robustness through achieving high-precision δ123Sb(antimony) values (relative to NIST 3102a) in samples with more complex matrices and low-Sb concentrations. By using element doping (113/111cadmium) coupled with sample-standard bracketing (SSB), a mass discrimination correction model was presented. The Sb isotope ratios of 30 geological reference materials (GRMs) were reported, in which the values of selected GRMs agreed well with previously published values. The SA method was then used to determine four of these with low-Sb samples. The analytical precision (2 standard deviations: 2SD) was found to mainly depend on the sample fraction (fspl) in the mixture, with the ideal mixing range recommended to be fspl ≥ 0.50 for single- and ≥ 0.45 for double SA when expected precision is ≤0.09‰ (2SD). The δ123Sb ratio calculated for basalt BCR-2 (Sb = 0.30 μg g−1) was 0.28 ± 0.09‰, and together with the other four GRMs, it confirmed that accurate and precise Sb isotopes can be analyzed for samples with low-Sb using SA. Validating the measurement of Sb isotope composition in low-Sb samples with complex matrices by SA will expand the application of Sb isotopes in environmental, agricultural, life, Earth, and planetary sciences.

Abstract Image

利用 HG-MC-ICP-MS† 标准添加法测定低锑样品中的锑同位素
近年来,标准添加(SA)法已成功用于测量金属稳定同位素。在这里,我们利用氢化物发生器(HG)-多收集器电感耦合等离子体质谱法(MC-ICP-MS,Nu Plasma II 和 Neptune Plus),在基质更复杂、锑浓度更低的样品中实现了高精度的δ123Sb(锑)值(相对于 NIST 3102a),从而评估了该方法的稳健性。通过使用元素掺杂(113/111镉)和样品标准括弧(SSB),提出了一种质量鉴别校正模型。报告了 30 种地质参考材料(GRMs)的锑同位素比值,其中所选地质参考材料的比值与之前公布的比值十分吻合。然后使用 SA 方法测定了其中四种低锑样品。研究发现,分析精度(2 个标准偏差:2SD)主要取决于混合物中的样品分数(fspl),建议单 SA 的理想混合范围为 fspl ≥ 0.50,双 SA 的理想混合范围为 fspl ≥ 0.45,预期精度≤0.09‰(2SD)。计算得出的玄武岩 BCR-2(Sb = 0.30 μg g-1)的δ123Sb比值为 0.28 ± 0.09‰,该比值与其他四个全球资源监测指标一起,证实了利用 SA 可以对低 Sb 样品进行准确和精确的 Sb 同位素分析。利用 SA 验证测量复杂基质的低锑样品中的锑同位素组成,将扩大锑同位素在环境、农业、生命、地球和行星科学中的应用。
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来源期刊
CiteScore
6.20
自引率
26.50%
发文量
228
审稿时长
1.7 months
期刊介绍: Innovative research on the fundamental theory and application of spectrometric techniques.
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