High-precision determination of lithium and magnesium isotopes utilising single column separation and multi-collector inductively coupled plasma mass spectrometry.
High-precision determination of lithium and magnesium isotopes utilising single column separation and multi-collector inductively coupled plasma mass spectrometry.
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DOI：
10.1002/rcm.8020
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发表时间：
2018-01-30
期刊：
影响因子：
--
通讯作者：
Bickle MJ
中科院分区：
文献类型：
--
作者：
Bohlin MS;Misra S;Lloyd N;Elderfield H;Bickle MJ
在地球科学中，锂和镁同位素越来越多地被用作一种组合工具。然而，已建立的方法需要使用几个柱分离程序的单独的样品纯化方案。本研究提出了一种从多个样品基质中定量分离痕量锂和镁的一步阳离子交换法。柱法使用大孔AGMP-50树脂和大长径比色谱柱，可以按照相同的洗脱程序从天然水、沉积物、岩石和碳酸盐基质中定量分离锂和镁。用多收集器电感耦合等离子体质谱(MC-ICPM)在Thermo Science™NEPOTUNE PLUS™上进行了高精度的同位素测定，该仪器配备了1013Ω放大器，可以在离子束≤0.51nV处进行准确和精确的测量。亚纳米克锂样品(0.3-0.5ng)使用所提出的柱法规则分离(产生1-70μg的镁质量)。同位素分析过程中总的样品消耗量为<；0.5ngLi和<；115ngMg，长期外部2σ精度为±0.39‰(δ7Li)和±0.07‰(δ26 mg)。用我们的方法分析的地质标准物质和海水的结果与公布的值非常吻合，尽管样品消耗量低了一个数量级。洗脱小样品质量的可能性和低分析样品消耗量使该方法非常适合于有限质量或低锂浓度的样品，如有孔虫、矿物分离物或稀释的河水。
Li and Mg isotopes are increasingly used as a combined tool within the geosciences. However, established methods require separate sample purification protocols utilising several column separation procedures. This study presents a single‐step cation‐exchange method for quantitative separation of trace levels of Li and Mg from multiple sample matrices. The column method utilises the macro‐porous AGMP‐50 resin and a high‐aspect ratio column, allowing quantitative separation of Li and Mg from natural waters, sediments, rocks and carbonate matrices following the same elution protocol. High‐precision isotope determination was conducted by multi‐collector inductively coupled plasma mass spectrometry (MC‐ICPMS) on the Thermo Scientific™ NEPTUNE Plus™ fitted with 1013 Ω amplifiers which allow accurate and precise measurements at ion beams ≤0.51 V. Sub‐nanogram Li samples (0.3–0.5 ng) were regularly separated (yielding Mg masses of 1–70 μg) using the presented column method. The total sample consumption during isotopic analysis is <0.5 ng Li and <115 ng Mg with long‐term external 2σ precisions of ±0.39‰ for δ7Li and ±0.07‰ for δ26Mg. The results for geological reference standards and seawater analysed by our method are in excellent agreement with published values despite the order of magnitude lower sample consumption. The possibility of eluting small sample masses and the low analytical sample consumption make this method ideal for samples of limited mass or low Li concentration, such as foraminifera, mineral separates or dilute river waters.
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影响因子：
3.8
作者：
Carignan, Jean;Vigier, Nathalie;Millot, Romain
通讯作者：
Millot, Romain
影响因子：
3.4
作者：
Huang, Kuo-Fang;You, Chen-Feng;Chung, Chuan-Hsiung
通讯作者：
Chung, Chuan-Hsiung
DOI：
10.1111/j.1751-908x.2004.tb01053.x
发表时间：
2004-01-01
影响因子：
3.8
作者：
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通讯作者：
Bouman, C
影响因子：
3.4
作者：
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通讯作者：
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影响因子：
2
作者：
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通讯作者：
Sun, Weidong