Le Fèvre B, Pin C
Département de Géologie, UMR 6524 CNRS, Université Blaise Pascal, Clermont-Ferrand, France.
Anal Chem. 2001 Jun 1;73(11):2453-60. doi: 10.1021/ac001237g.
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.
已开发出一种新颖的方法，用于从地质样品的所有基体元素中一步分离Zr和Hf，以便使用多接收电感耦合等离子体质谱仪进行Hf同位素测量。该方法将LiBO₂熔融有效分解样品与基于二戊基膦酸戊酯的固相萃取材料（商品名为U-TEVA.Spec）选择性分离Hf和Zr相结合。使用这种简单快速的程序，Hf和Zr可以在单个分离步骤中分离出来，回收率良好（>90%），空白水平令人满意（约55 pg的Hf），从而可以进行后续的ICPMS同位素测量。该方法能与造岩成分实现出色的分离，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）。通过对七种硅酸盐岩石国际标准物质中的¹⁷⁶Hf/¹⁷⁷Hf比值进行多次MC-ICPMS测量，证明了这种新方法在Hf同位素分析中的潜力，这些标准物质涵盖了不同的Hf含量和整体成分范围。
