Determination Of Silver In Geological Samples Using Aerosol Dilution ICP-MS After Water-Bath Extraction With Inverse Aqua Regia

IF 3.4 2区 化学 Q1 SPECTROSCOPY Atomic Spectroscopy Pub Date : 2021-10-01 DOI:10.46770/as.2021.906
Yan Wu
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引用次数: 3

Abstract

A valid method for trace silver (Ag) detection in geological samples was developed in this study using aerosol dilution inductively coupled plasma-mass spectrometry after extraction with inverse aqua regia. This was proposed primarily to reduce the interference from Nb and Zr during mass spectrometric measurements. Almost 93% of Nb and Zr was removed after the extraction. By mixing an appropriate amount of Ar with the sample aerosol using an aerosol dilution system prior to plasma, the residual Nb oxides and Zr oxides or hydroxides could be successfully removed. The relative yields of the interfering oxides and hydroxides were as low as 0.087% (NbO/Nb) and 0.013% (ZrOH/Zr), which were 3–5 times lower than those in the traditional mode without the addition of Ar. Moreover, the signal-to-noise ratio of Ag was five times higher than that in the traditional mode. The proposed method was applied to the determination of Ag in 68 standard reference materials (SRMs) of soil, sediment, and rock. The results for 47 of these geological SRMs were in good agreement with the reference values. The Ag levels in three SRMs (GSP-2 Granodiorite, STM-2, and SGR-1b) are being reported for the first time herein. For these SRMs, 10 separate aliquots of the sample were digested and analyzed over a period of three months, and analysis revealed that the determined values were reasonable. Thus, the proposed method shows significant potential for the accurate determination of trace Ag in various geological samples.
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反相水浴萃取-气溶胶稀释ICP-MS法测定地质样品中的银
本研究采用反相王水萃取后的气溶胶稀释电感耦合等离子体质谱法,建立了一种有效的地质样品中痕量银的检测方法。这主要是为了减少质谱测量过程中Nb和Zr的干扰。在提取之后,几乎93%的Nb和Zr被去除。通过在等离子体之前使用气溶胶稀释系统将适量的Ar与样品气溶胶混合,可以成功地去除残留的Nb氧化物和Zr氧化物或氢氧化物。干扰氧化物和氢氧化物的相对产率低至0.087%(NbO/Nb)和0.013%(ZrOH/Zr),比不添加Ar的传统模式低3-5倍。此外,Ag的信噪比比比传统模式高5倍。将该方法应用于土壤、沉积物和岩石中68种标准参考物质中Ag的测定。其中47个地质SRM的结果与参考值非常一致。本文首次报道了三种SRM(GSP-2 Granodiorite、STM-2和SGR-1b)中的Ag水平。对于这些SRM,在三个月的时间内消化和分析了10份单独的等分试样,分析表明所确定的值是合理的。因此,该方法在准确测定各种地质样品中的痕量银方面显示出巨大的潜力。
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来源期刊
Atomic Spectroscopy
Atomic Spectroscopy 物理-光谱学
CiteScore
5.30
自引率
14.70%
发文量
42
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.
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