Measurements of mass-dependent Te isotopic variation by hydride generation MC-ICP-MS,Journal of Analytical Atomic Spectrometry

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Measurements of mass-dependent Te isotopic variation by hydride generation MC-ICP-MS
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2019/12/11 , DOI: 10.1039/c9ja00244h
N. L. Wasserman _{1,

2,

3,

4} , T. M. Johnson _{1,

2,

3,

4}

Affiliation

Tellurium (Te) stable isotope measurements have the potential to serve as tracers of Te mobility and redox conditions in modern and ancient environments. Here, we present a method to measure Te isotope ratios by MC-ICP-MS utilizing a hydride generation system to efficiently deliver Te to the plasma, in combination with a ¹²⁰Te–¹²⁴Te double spike. This approach allows for precise δ¹³⁰Te/¹²⁶Te (2σ: 0.09‰) measurements while using less than 8.75 ng of natural Te. Although hydride generation methods usually produce higher sensitivity than more conventional methods, for Te, the sensitivity is similar, on our instrument, to that achieved using a desolvating nebulizer. Nonetheless, hydride generation has an advantageous ability to exclude interfering elements such as Ba and allow analysis of samples without chemical separation of Te in some cases. We also demonstrate successfully a modified ion exchange procedure to separate various matrix components and isobaric interferences from Te in natural sediments. Analyses of multiple digestions of USGS standard reference materials, mine tailings, ancient sediments, and soils utilizing this approach show the largest spread in terrestrial Te isotopic composition to date (δ¹³⁰Te/¹²⁶Te ∼ 1.21‰) and a lack of detectable mass-independent fractionation.

中文翻译：

氢化物发生MC-ICP-MS测定质量相关的Te同位素变化

碲（Te）稳定同位素测量有可能在现代和古代环境中用作Te迁移率和氧化还原条件的示踪剂。在这里，我们介绍一种通过使用氢化物发生系统将Te高效结合到等离子体中的氢化物发生系统和¹²⁰ Te– ¹²⁴ Te双尖峰的方法来测量Te同位素比的方法。该方法允许精确δ ¹³⁰的Te / ¹²⁶值Te（2 σ：0.09‰）测量，同时使用少于8.75 ng的天然Te。尽管氢化物生成方法通常比常规方法具有更高的灵敏度，但对于Te而言，在我们的仪器上，该灵敏度与使用脱溶剂雾化器实现的灵敏度相似。但是，在某些情况下，生成氢化物具有排除干扰元素（例如Ba）并允许分析样品而无需Te的化学分离的有利能力。我们还成功地展示了一种改良的离子交换程序，可分离天然沉积物中Te的各种基质成分和同量异位干扰。美国地质勘探局的标准参考材料，尾矿，古老的沉积物，并利用这种方法土壤多消化的分析表明在地面特同位素组成迄今为止最大的传播（δ ¹³⁰Te / ¹²⁶ Te〜1.21‰）和缺乏可检测的质量无关的分离。

更新日期：2020-02-13

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