An extraction chromatography method for Hf separation prior to isotopic analysis using multiple collection ICP-mass spectrometry.
An extraction chromatography method for Hf separation prior to isotopic analysis using multiple collection ICP-mass spectrometry.
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DOI：
10.1021/ac001237g
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发表时间：
2001-06
影响因子：
7.4
通讯作者：
B. Le Fèvre;C. Pin
中科院分区：
文献类型：
--
作者：
B. Le Fèvre;C. Pin
开发了一种从地质样品的所有基质元素中单步分离 Zr + Hf 的新方法，用于使用多收集器 ICP 质谱法进行 Hf 同位素测量。该方法结合了 LiBO2 熔融的有效样品分解和基于二戊基戊基膦酸酯（商品名为 U-TEVA.Spec）的固相萃取材料对 Hf + Zr 的选择性分离。使用这种简单快速的程序，可以在单个分离步骤中分离出 Hf 和 Zr，具有良好的回收率 (>90%) 和令人满意的空白水平（大约 55 pg Hf），因此可以使用 ICPMS 进行后续同位素测量。可以实现与岩石形成成分的良好分离，包括那些已知会干扰基于离子交换技术的传统分离方法的元素（Al、P、Ti、Cr、Fe、Mo 等）。通过对七种国际硅酸盐岩石参考材料中 176Hf/177Hf 比率的重复 MC-ICPMS 测量（涵盖一系列 Hf 含量和整体成分），证明了这种 Hf 同位素分析新方法的潜力。
A novel method for the single-step separation of Zr + Hf from all matrix elements of geological samples has been developed for Hf isotopic measurements using multiple collector-ICP-mass spectrometry. The method combines an effective sample decomposition by LiBO2 fusion with a selective separation of Hf + Zr by a solid-phase extraction material based on dipentyl pentyl phosphonate, commercially available as U-TEVA.Spec. Using this simple and rapid procedure, Hf and Zr can be isolated in a single separation step with good recoveries (>90%) and satisfactory blank levels (approximately 55 pg of Hf), so that a subsequent isotopic measurement with ICPMS is possible. An excellent separation from rock-forming constituents is achieved, including those elements (Al, P, Ti, Cr, Fe, Mo, etc.) known to interfere in conventional separation methods based on ion-exchange techniques. The potential of this new method for Hf isotopic analysis is demonstrated by replicate MC-ICPMS measurements of 176Hf/177Hf ratios in seven international reference materials of silicate rocks, spanning a range of Hf contents and bulk compositions.