Purification of Hf in silicate materials using extraction chromatographic resin, and its application to precise determination of 176Hf/177Hf by MC-ICP-MS with 179Hf spike
Purification of Hf in silicate materials using extraction chromatographic resin, and its application to precise determination of 176Hf/177Hf by MC-ICP-MS with 179Hf spike
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DOI：
10.1039/b610197f
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发表时间：
2007
影响因子：
3.4
通讯作者：
Yinghuai Lu;A. Makishima;Eizo Nakamura
中科院分区：
文献类型：
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作者：
Yinghuai Lu;A. Makishima;Eizo Nakamura
本文提出了用萃取色层树脂UTEVA两级柱净化硅酸盐样品中锆等元素中铪的方法。在第一柱中，使用阴离子交换树脂，收集AG 1X 8、Hf、Zr和Ti。在第二种方法中，使用UTEVA，并通过用HClO 4蒸发和用H2 O2-HNO 3再溶解来消除F−之后，基于UTEVA树脂的特性，Hf分配系数（Kd）从770降低到40，而Zr的Kd从890降低到200，分别在9和6 mol l−1 HNO 3中。Hf的回收率为1.88%，总空白为1.4pg。还开发了MC-ICP-MS Hf同位素比值测定方法，该方法使用179 Hf加标同时测定Hf浓度和176 Hf/177 Hf比值。结合化学和ICP-MS技术，对硅酸盐标准物质中的176 Hf/177 Hf比值进行了测定，得到了相同的结果，表明了该方法的适用性。
A two-stage column purification method for Hf from Zr and other elements in silicate samples using the extraction chromatographic resin, UTEVA has been developed. In the first column, using an anion-exchange resin, AG 1X8, Hf, Zr and Ti were collected. In the second, using UTEVA, and after eliminating F− by evaporation with HClO4 and re-dissolution with H2O2–HNO3, Hf was purified from Ti and Zr, based on characteristic of the UTEVA resin that Hf distribution coefficient (Kd) decreases from 770 to 40, while Kd of Zr decreases less from 890 to 200, in 9 and 6 mol l−1 HNO3, respectively. The recovery yield of Hf was ∼88% and total blank was ∼4 pg. A MC-ICP-MS Hf isotope ratio determination method was also developed, which uses 179Hf spike for simultaneous determination of the Hf concentration and 176Hf/177Hf ratio. Combining the chemistry and ICP-MS techniques, 176Hf/177Hf ratios in silicate reference materials were determined with and without the spike, which gave identical results, showing the applicability of this method.