MC-ICP-MS对溶液标准品和地质标准品的精确分析

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Dandan Li, Zida Zhang, Xuesong Fan, Tianhao Wu, Zixuan Huang, Qianqian Shen, Xuefei Liu and Sheng-Ao Liu
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引用次数: 0

摘要

镓(Ga)同位素作为一种新的地球化学示踪剂正得到越来越多的应用,但在大多数地质样品中,Ga同位素比率的适度变化需要精确和准确的Ga同位素分析。此外,Ga同位素分析的统一标准物质尚未建立。在此,我们报告了一种使用AG1-X8和AG50W-X8交换树脂从地质样品中完全分离Ga的新方法,收率为99.5%。采用低分辨率模式的Neptune Plus多收集器电感耦合等离子体质谱仪(MC-ICP-MS)测量同位素比率,采用内部标准化方法(C-SSBIN)进行质量偏差校正,结果报告为δ71Ga,单位为每mil,相对于NIST SRM 3119a。以两种纯Ga溶液(NIST SRM 994和GBW(E) 080560)作为次级标准物质进行Ga同位素分析,对NIST SRM 3119a的δ71Ga分别为- 2.11±0.05‰(2SD, n = 106)和- 1.00±0.04‰(2SD, n = 97)。报道了GSS-1、GSS-11、GSS-12、GXR-1、NIST SRM 2711a、GSD-12、NOD-P-1、BHVO-2、BCR-2、GSP-2、JG-1、JGb-2、GSR-1、GSR-6、AGV-2、SGR-1b等地质参考物质的Ga同位素组成,其中约半数为首次报道。在标准物质重复测量的基础上,长期外部重现性为±0.07‰(2SD)。我们的研究结果表明,尽管在辉长岩和锰结核中观察到明显的变化,但Ga同位素在火成岩过程中没有明显的分馏。我们的分析进一步证实了NIST SRM 994在Ga同位素方面具有同位素不均匀性,我们推荐NIST SRM 3119a作为Ga同位素分析的零点参考物质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Precise and accurate Ga isotope analysis of solution standards and geological reference materials by MC-ICP-MS

Gallium (Ga) isotopes are being increasingly applied as a new geochemical tracer, but the modest variations in Ga isotope ratios in most of the geological samples necessitate precise and accurate Ga isotope analysis. Additionally, a unified reference material for Ga isotope analysis has yet to be established. Herein, we report a novel procedure for complete separation of Ga from matrices in geological samples using AG1-X8 and AG50W-X8 exchange resins with yields of >99.5%. Isotope ratios were measured using a Neptune Plus multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) in low-resolution mode, employing internal standardization methods (C-SSBIN) for mass bias correction, and the results are reported as δ71Ga in units per mil against NIST SRM 3119a. Two pure Ga solutions (NIST SRM 994 and GBW(E) 080560) were used as secondary reference materials during Ga isotope analysis, with δ71Ga of −2.11 ± 0.05‰ (2SD, n = 106) and −1.00 ± 0.04‰ (2SD, n = 97) against NIST SRM 3119a, respectively. The Ga isotope compositions of a suite of geological reference materials (GSS-1, GSS-11, GSS-12, GXR-1, NIST SRM 2711a, GSD-12, NOD-P-1, BHVO-2, BCR-2, GSP-2, JG-1, JGb-2, GSR-1, GSR-6, AGV-2 and SGR-1b) were reported, with about half of them for the first time. The long-term external reproducibility is ±0.07‰ (2SD) based on replicated measurements of reference materials. Our results reveal that Ga isotopes are not significantly fractionated during igneous processes, although distinct variations are observed in gabbro and Mn nodules. Our analyses further confirm that NIST SRM 994 is isotopically heterogeneous with respect to Ga isotopes, and we recommend NIST SRM 3119a as the zero-point reference material for Ga isotope analysis.

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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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