A new digestion and chemical separation technique for rapid and highly reproducible determination of Lu/Hf and Hf isotope ratios in geological materials by MC-ICP-MS
A new digestion and chemical separation technique for rapid and highly reproducible determination of Lu/Hf and Hf isotope ratios in geological materials by MC-ICP-MS
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DOI：
10.1111/j.1751-908x.2003.tb00641.x
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发表时间：
2003-01-01
期刊：
影响因子：
--
通讯作者：
Ulfbeck, D
中科院分区：
文献类型：
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作者：
Bizzarro, M;Baker, JA;Ulfbeck, D
一种新的消解程序和化学分离技术已经开发出来，用于测量 Lu/Hf 和 Hf 同位素比，不需要高压弹或使用 HF 或 HClO4 酸。在偏硼酸锂存在下，在 1100 摄氏度下进行助熔熔化后，在稀 HCl 或 HNO3 中消解样品。通过与氢氧化铁共沉淀，从该溶液中分离出高场强元素 (HFSE) 和稀土元素 (REE)。将溶解的沉淀物（在 2 mol l(-1) HCl 中）直接加载到标准阳离子交换柱上，该柱将剩余的样品基质与重 REE (Lu+Yb)、中轻 REE 和 HFSE (Hf) 分离。然后使用含有 TEVA 规格树脂的小型柱分离中光 REE 和单独的 HFSE（10.5、9 和 6 mol l(-1) HCl），该树脂提供不含 REE、Ti 和 Zr 的 Hf 馏分。这种化学分离方案也可以很容易地适用于 Sm-Nd 系统和/或其他 HFSE（Ti、Zr）的同位素分析。该技术的总程序空白为
A new digestion procedure and chemical separation technique has been developed for measurement of Lu/Hf and Hf isotope ratios that does not require high-pressure bombs or use of HF or HClO4 acids. Samples are digested in dilute HCl or HNO3 after flux-fusion at 1100 degreesC in the presence of lithium metaborate. High field strength elements (HFSE) and rare earth elements (REE) are separated from this solution by co-precipitation with iron hydroxide. The dissolved precipitate (in 2 mol l(-1) HCl) is loaded directly onto a standard cation exchange column which separates remaining sample matrix from the heavy REE (Lu+Yb), and the middle-light REE and HFSE (Hf). The middle-light REE and individual HFSE are then separated (10.5, 9 and 6 mol l(-1) HCl) using a miniaturized column containing TEVA spec resin which provides a REE-, Ti- and Zr-free Hf cut. This chemical separation scheme can also be readily adapted for isotopic analysis of the Sm-Nd system and/or the other HFSE (Ti, Zr). Total procedural blanks for this technique are