Separation of thorium and uranium from silicate rock samples using two commercial extraction chromatographic resins.
Separation of thorium and uranium from silicate rock samples using two commercial extraction chromatographic resins.
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使用两种商用萃取色谱树脂从硅酸盐岩石样品中分离钍和铀。
DOI：
10.1021/ac9805807
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发表时间：
1999
影响因子：
7.4
通讯作者：
E. Nakamura
中科院分区：
文献类型：
--
作者：
Tetsuya Yokoyama;and Akio Makishima;E. Nakamura
采用两种商用萃取色谱树脂，建立了从硅酸盐岩石中分离Th和U的化学分离新技术。在第一柱程序中，用U/Teva·SPEC树脂，除Th和U外，几乎所有元素都被4M HNO(3)洗脱。然后用5M盐酸分离TH，最后通过连续加入0.1M HNO(3)来分离U。Th组分中仍保留有大量的Zr，然后用Teva·SPEC树脂在第二柱阶段进一步提纯。在第二步中，先用2M HNO(3)淋洗，然后用0.1M HNO(3)收集Th。通过这些步骤得到的Th和U组分都足够纯净，可以用于热电离质谱分析(TIMS)。Th和U的回收率均在90%以上，总空白Th为19pg，U为10pg。该方法在基质效应、拖尾问题和分离程度等方面均优于以往的方法。由于Th和U有效地分离，不受共存阳离子和阴离子的任何基质干扰，该技术不仅可用于火成岩样品的分析，还可用于土壤、海洋沉积物、碳酸盐、磷酸盐和海水、地下水和地表水的分析。
A new chemical separation technique to isolate Th and U from silicate rocks was established by using two kinds of commercial extraction chromatographic resins. In the first column procedure, with U/TEVA·spec resin, almost all elements except Th and U were eluted by 4 M HNO(3). Th was then separated by using 5 M HCl, and U was finally isolated by successive addition of 0.1 M HNO(3). A significant amount of Zr still remained in the Th fraction, which was then further purified in the second column stage using TEVA·spec resin. In the second procedure, Zr was eluted first by using 2 M HNO(3), and then Th was collected by 0.1 M HNO(3). Both the Th and U fractions obtained by these procedures were sufficiently pure for thermal ionization mass spectrometric (TIMS) analysis. Recovery yields of Th and U exceeded 90%, and total blanks were <19 pg for Th and <10 pg for U. Our method has advantages over previous methods in terms of matrix effects, tailing problems, and degree of isolation. Since Th and U are effectively separated without suffering any matrix interference from coexisting cations and anions, this technique can be used not only for the analysis of igneous rock samples but also for the analysis of soils, marine sediments, carbonates, phosphates and seawater, groundwater, and surface water.