Abundances of Sulfur, Selenium, Tellurium, Rhenium and Platinum‐Group Elements in Eighteen Reference Materials by Isotope Dilution Sector‐Field ICP‐MS and Negative TIMS
Abundances of Sulfur, Selenium, Tellurium, Rhenium and Platinum‐Group Elements in Eighteen Reference Materials by Isotope Dilution Sector‐Field ICP‐MS and Negative TIMS
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DOI：
10.1111/j.1751-908x.2013.00258.x
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发表时间：
2014-06
影响因子：
3.8
通讯作者：
Zaicong Wang;H. Becker
中科院分区：
文献类型：
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作者：
Zaicong Wang;H. Becker
通过同位素稀释质谱法分析了具有可变成分的地质标准物质（RM）和NIST SRM 612，以获得硫属元素（硫、硒和碲）、铂族元素（PGEs：Ru、Pd、Os、Ir和Pt）的整体岩石浓度，包括187 Os/188 Os的同位素数量比。在320 °C下在高压灰化器中HCl-HNO 3消化后，从相同的等分试样获得所有浓度。通过负TIMS、ICP-MS和氢化物发生ICP-MS（Se，Te）进行化学分离后测定浓度。与先前的研究一样，发现大多数RM中的PGEs浓度变化很大，这可能归因于< 1 g水平的样本异质性。相比之下，S、Se和Te在大多数RM中显示出良好的精度（RSD < 5%），表明与硫族元素预算相比，部分PGE预算由不同的相控制。该方法可以最大限度地减少封闭系统消解过程中挥发性硫属元素的损失，并表明相同样品等分试样中硫属元素、Re和PGE的不同异质性程度。OKUM、SCo-1、MRG-1、DR-N和MAG-1是硫属元素的有用RM。NIST SRM 612显示30 mg等分试样中S、Se、Te、Pt和Pd的均匀分布，与Se、Pd和Pt的微观不均匀性形成对比。
Geological reference materials (RMs) with variable compositions and NIST SRM 612 were analysed by isotope dilution mass spectrometry for bulk rock concentrations of chalcogen elements (sulfur, selenium and tellurium), rhenium and platinum‐group elements (PGEs: Ru, Pd, Os, Ir and Pt), including the isotope amount ratios of 187Os/188Os. All concentrations were obtained from the same aliquot after HCl‐HNO3 digestion in a high pressure asher at 320 °C. Concentrations were determined after chemical separation by negative TIMS, ICP‐MS and hydride generation ICP‐MS (Se, Te). As in previous studies, concentrations of the PGEs in most RMs were found to be highly variable, which may be ascribed to sample heterogeneity at the < 1 g level. In contrast, S, Se and Te displayed good precision (RSD < 5%) in most RMs, suggesting that part of the PGE budget is controlled by different phases, compared with the chalcogen budget. The method may minimise losses of volatile chalcogens during the closed‐system digestion and indicates the different extent of heterogeneity of chalcogens, Re and PGEs in the same sample aliquot. OKUM, SCo‐1, MRG‐1, DR‐N and MAG‐1 are useful RMs for the chalcogens. NIST SRM 612 displays homogenous distribution of S, Se, Te, Pt and Pd in 30 mg aliquots, in contrast with micro‐scale heterogeneity of Se, Pd and Pt.