Determination Of The Isotopic Composition Of An Enriched Lutetium Spike By MC-ICP-MS

IF 3.4 2区化学 Q1 SPECTROSCOPY

Atomic Spectroscopy Pub Date : 2022-11-01 DOI:10.46770/as.2022.188

K. Zong

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引用次数: 0

Abstract

In geochronology, the isotope dilution (ID) method has been developed as an analytical method that provides accurate and precise element concentration and isotope ratio. For the ideal application of spiked sample, the critical prerequisite is the accurate isotopic composition of spike, which is commonly challenging to determine accurately. In this study, we report the first independent measurement of lutetium (Lu) isotopic composition in a Lu spike by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) using an optimized regression mass bias correction model. The rhenium (Re) reference material (NIST SRM 3143), previously calibrated against the NRC CRM IRIS-1 isotopic iridium (Ir), was selected as the primary calibrant to calibrate the Lu isotope ratio in Lu spike. The obtained ratio of R175/176 Lu was ..19994 .....5. (u, k11), which meets the required precision levels for the Lu-Hf isotopic system application. The accuracy of the Lu Hf isochron age was improved by the application of the precisely calibrated Lu spike, and this Lu spike was successful applied for the determination of Lu concentration in geological reference material. The application of the optimized regression model was further broadened by determining the isotopic composition of the Lu spike.

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MC-ICP-MS法测定富集镥穗的同位素组成

在地质年代学中，同位素稀释（ID）方法已被发展为一种提供准确和精确的元素浓度和同位素比率的分析方法。对于加标样品的理想应用，关键的先决条件是准确的加标同位素组成，这通常很难准确确定。在本研究中，我们报道了使用优化回归质量偏差校正模型，通过多收集器电感耦合等离子体质谱法（MC-ICP-MS）首次独立测量Lu尖峰中的镥（Lu）同位素组成。先前根据NRC CRM IRIS-1同位素铱（Ir）校准的铼（Re）参考材料（NIST SRM 3143）被选为校准Lu尖峰中Lu同位素比率的主要校准剂。所获得的R175/176Lu的比率为。。19994。。。。。5.（u，k11），满足Lu-Hf同位素系统应用所需的精度水平。应用精确校准的Lu尖峰，提高了Lu-Hf等时线年龄的准确性，该Lu尖峰成功地应用于地质参考物质中Lu浓度的测定。通过测定鲁刺的同位素组成，进一步拓宽了优化回归模型的应用范围。

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来源期刊

Atomic Spectroscopy 物理-光谱学

CiteScore

5.30

自引率

14.70%

发文量

审稿时长

4.5 months

期刊介绍： The ATOMIC SPECTROSCOPY is a peer-reviewed international journal started in 1962 by Dr. Walter Slavin and now is published by Atomic Spectroscopy Press Limited (ASPL). It is intended for the rapid publication of both original articles and review articles in the fields of AAS, AFS, ICP-OES, ICP-MS, GD-MS, TIMS, SIMS, AMS, LIBS, XRF and related techniques. Manuscripts dealing with (i) instrumentation & fundamentals, (ii) methodology development & applications, and (iii) standard reference materials (SRMs) development can be submitted for publication.