A method for purifying Lu and Hf for analyses by MC-ICP-MS using TODGA resin
A method for purifying Lu and Hf for analyses by MC-ICP-MS using TODGA resin
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DOI：
10.1016/j.chemgeo.2006.02.020
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发表时间：
2006-09-30
期刊：
影响因子：
3.9
通讯作者：
Housh, T.
中科院分区：
文献类型：
--
作者：
Connelly, J. N.;Ulfbeck, D. G.;Housh, T.
本文提出了一种两步法分离硅酸盐岩矿样品中的Lu和Hf的方法。第一阶段的化学采用2毫升的阳离子交换柱，从基质中分离高场强元素（HFSE）和稀土元素（REE）。Hf-Zr和Yb-Lu随后在第二阶段0.2-ml TODGA柱上从HFSE-REE浓缩物中分离。该方法返回足够纯的馏分以克服所有原子和分子干扰以及Ti对与MC-ICP-MS相关的Hf分馏的有害影响。硼酸在该方法中起两个作用：（1）它有效地分解在HF-HNO 3二次分解后的干燥步骤中形成的氟化物，从而避免使用高氯酸和/或多个干燥和再溶解步骤，和（2）将其加入到第二阶段化学的加载溶液中以防止形成不能被TODGA树脂保留的Hf-氟化物。使用这些方法，国际岩石标准BHVO-1（通过熔剂熔融和HF-HNO3溶解处理）和BCR-2（通过HF-HNO3溶解处理）产生与公布值重叠的Hf-176/Hf-177和Lu-176/Hf-177比率。排列的基本方法，提出了显着提高轻稀土含量的样品和分离的Lu和Hf的锆石。(c)2006 Elsevier B.V.保留所有权利。
A two-stage method is presented to separate Lu and Hf from silicate rock and mineral samples digested by either flux melting or HF-HNO3 dissolution using TODGA resin from Eichrom Industries. A first-stage chemistry employs a 2-ml cation exchange column that separates the high-field-strength elements (HFSE) and rare-earth elements (REE) from the matrix. Hf-Zr and Yb-Lu are subsequently separated from the HFSE-REE concentrates on a second-stage 0.2-ml TODGA column. This method returns sufficiently pure cuts to overcome all atomic and molecular interferences as well as the detrimental effects of Ti on Hf fractionation associated with MC-ICP-MS. Boric acid serves two roles in this method: (1) it effectively breaks down fluorides formed in the dry-down step after HF-HNO3 digestions, thereby avoiding use of perchloric acid and/or multiple dry-down and re-dissolution steps, and (2) it is added to the loading solution of the second-stage chemistry to prevent formation of Hf-fluorides that would not be retained by TODGA resin. Using these methods, international rock standards BHVO-1 (processed by both flux melting and HF-HNO3 dissolution) and BCR-2 (processed by HF-HNO3 dissolution) yield Hf-176/Hf-177 and Lu-176/Hf-177 ratios that overlap with published values. Permutations of the basic method are presented for samples with significantly elevated LREE contents and for the separation of Lu and Hf from zircon. (c) 2006 Elsevier B.V. All rights reserved.