イオンクロマトグラフ分離/中性子放射化分析法と等速電気泳動分離/粒子励起X線分析法による希土類元素試料(ジジム)の分析 <テクニカルレター>

Analysis of a rare-earth sample, Didym by ion chromatography/neutron activation analysis and isotachophoresis/particle induced X-ray emission method

Takemi Hirokatsu

Shidawara Hokuto

Ito Kazuaki

Hashimoto Yoshio

Nishiyama Fumitaka

Hirokawa Takeshi

分析化学

希土類元素の発見史において, 当時単元素と考えられていたジジム (Didym) はBraunerにより現在のPr, Ndに分離され原子量が測定されている (1882年). 本研究では, 実際の分離過程で使用された酸化物試料中の希土類元素の組成を二つの結合分析法を用いて分析した. 中性子放射化分析法 (NAA) では, 40μgの試料で四つの元素が測定されたのに対して, イオンクロマトグラフ分離 (IC) を組み合わせたIC/NAAを用いた分析では, 100μgのジジムを分析したとき, 0.004重量%のYbなど13種の希土類元素を定量することが可能であった. 一方, 等速電気泳動分離/粒子励起X線分析法 (ITP/PIXE) では12種の希土類元素が定量できた. 二つの結合分析法による測定結果はよく一致しており, セル石 (Cerite) から分離されたジジムには, CeはほとんどなかったがLaが多量に含まれており, 今回分析した試料はLaを分離する前の試料と推察された.

In the history of the discovery of rare-earth elements, two elements, Pr and Nd were isolated by Brauner (1882) from a rare-earth sample (Didym) which was considered to be mono-element and their atomic numbers were also determined. In this study, the oxide sample employed in the separation processes was analyzed using two coupled analytical methods, ion chromatography/neutron activation analysis (IC/NAA) and isotachophoresis/particle induced X-ray emission method (ITP/PIXE). Four rare-earth elements were only determined by NAA of 40 μg of Digym. Whereas for IC/NAA with preseparation process, 13 rare-earth elements containing 0.004 mass% Yb were determined when 100 μg of Didym was analyzed. For ITP/PIXE, 12 rare-earth elements were determined. The results obtained by the coupled analytical methods agreed with each other. Although the content of Ce in the sample (Didym) obtained from Cerite was very small, that of La was large, suggesting that chemical treatments to remove La had not been achieved.

Rare-earth sample (Didym)

Cerite

Coupled analytical methods

IC/NAA

ITP/PIXE

Chemistry [ 430 ]

jpn

日本分析化学会

Copyright (c) 2002 The Japan Society for Analytical Chemistry

本文データはJ-STAGEから複製したものである

[ISSN] 0525-1931

[DOI] 10.2116/bunsekikagaku.51.1063

[NCID] AN00222633

[DOI] http://dx.doi.org/10.2116/bunsekikagaku.51.1063