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Rubidium purification via a single chemical column and its isotope measurement on geological standard materials by MC-ICP-MS
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7ja00406k Zhuoying Zhang 1, 2, 3, 4, 5 , Jinlong Ma 1, 2, 3, 4, 5 , Le Zhang 1, 2, 3, 4, 5 , Ying Liu 1, 2, 3, 4, 5 , Gangjian Wei 1, 2, 3, 4, 5
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7ja00406k Zhuoying Zhang 1, 2, 3, 4, 5 , Jinlong Ma 1, 2, 3, 4, 5 , Le Zhang 1, 2, 3, 4, 5 , Ying Liu 1, 2, 3, 4, 5 , Gangjian Wei 1, 2, 3, 4, 5
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A chromatographic procedure for Rb, K, Ba and Sr one-by-one separation from geological materials has been developed by using a single column with packing Sr-spec resin, followed by high-precision Rb isotope measurement by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The main matrix elements (Ti, Al, Mg, Fe, Mn, Na and Ca) were removed with 4.4 mL of 3 M HNO3 first; Rb and K were then sequentially eluted in different volumes with the same acid. After that, Ba was eluted with 8 M HNO3, and finally Sr was eluted with Milli-Q water. This procedure enables us to collect pure Rb, K, Ba and Sr one by one in a single column with recovery close to 100%. The purified Rb was measured by using a standard-sample bracketing method via MC-ICP-MS. The short-term precision for δ87Rb was better than ±0.03‰ (2SD, for 15 hours), and the long-term (more than 12 months) external precision was better than ±0.06‰ (2SD) based on repeated analysis of Rb standard solution NIST SRM 984. Matrix effects on Rb isotope measurement by MC-ICP-MS were tested by doping pure Rb standard with various amounts of matrix elements and were found to be insignificant when Na/Rb < 2, Ca/Rb < 4 and K/Rb < 25. We measured a set of geological reference standards by this method and found significant Rb isotopic variation. Our study suggests that Rb isotope geochemistry may be a promising tracer of various cosmochemical and geological processes.
中文翻译：
通过单一化学柱 纯化purification ，并通过MC-ICP-MS对地质标准物质进行同位素测量
通过使用装有Sr规格树脂的单柱色谱柱，然后通过多收集器电感耦合等离子体进行高精度Rb同位素测量，开发了一种从地质材料中一对一分离Rb，K，Ba和Sr的色谱方法质谱（MC-ICP-MS）。首先用4.4 mL的3 M HNO 3去除主要的基质元素（Ti，Al，Mg，Fe，Mn，Na和Ca）；然后依次用相同的酸将Rb和K洗脱成不同的体积。之后，用8 M HNO 3洗脱Ba ，最后用Milli-Q水洗脱Sr。该程序使我们能够在单个色谱柱中一个接一个地收集纯Rb，K，Ba和Sr，回收率接近100％。使用标准样品包围法通过以下方法测量纯化的Rb：MC-ICP-MS。根据对Cr 87 Rb的重复分析，δ87 Rb的短期精度优于±0.03‰（2SD，15小时），长期（12个月以上）的外部精度优于±0.06‰（2SD）。 Rb标准溶液NIST SRM 984.通过用各种量的基质元素掺杂纯Rb标准品来测试基质对MC-ICP-MS对Rb同位素测量的影响，发现当Na / Rb <2，Ca / Rb <4时，基质影响不显着K / Rb <25。我们通过这种方法测量了一套地质参考标准，发现Rb同位素存在显着变化。我们的研究表明，b同位素地球化学可能是各种宇宙化学和地质过程的有前途的示踪剂。
更新日期：2018-01-04
中文翻译：
通过单一化学柱 纯化purification ，并通过MC-ICP-MS对地质标准物质进行同位素测量
通过使用装有Sr规格树脂的单柱色谱柱，然后通过多收集器电感耦合等离子体进行高精度Rb同位素测量，开发了一种从地质材料中一对一分离Rb，K，Ba和Sr的色谱方法质谱（MC-ICP-MS）。首先用4.4 mL的3 M HNO 3去除主要的基质元素（Ti，Al，Mg，Fe，Mn，Na和Ca）；然后依次用相同的酸将Rb和K洗脱成不同的体积。之后，用8 M HNO 3洗脱Ba ，最后用Milli-Q水洗脱Sr。该程序使我们能够在单个色谱柱中一个接一个地收集纯Rb，K，Ba和Sr，回收率接近100％。使用标准样品包围法通过以下方法测量纯化的Rb：MC-ICP-MS。根据对Cr 87 Rb的重复分析，δ87 Rb的短期精度优于±0.03‰（2SD，15小时），长期（12个月以上）的外部精度优于±0.06‰（2SD）。 Rb标准溶液NIST SRM 984.通过用各种量的基质元素掺杂纯Rb标准品来测试基质对MC-ICP-MS对Rb同位素测量的影响，发现当Na / Rb <2，Ca / Rb <4时，基质影响不显着K / Rb <25。我们通过这种方法测量了一套地质参考标准，发现Rb同位素存在显着变化。我们的研究表明，b同位素地球化学可能是各种宇宙化学和地质过程的有前途的示踪剂。
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