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Determination of rare-earth elements in a limestone geological standard reference material by ICP-MS following solvent extraction.

Authors
  • Igarashi, Kengo
  • Akagi, Tasuku
  • Fu, Feng-Fu
  • Yabuki, Sadayo
Type
Published Article
Journal
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry
Publication Date
Mar 01, 2003
Volume
19
Issue
3
Pages
441–445
Identifiers
PMID: 12675356
Source
Medline
License
Unknown

Abstract

Rare-earth elements in a limestone geological standard (JLs-1) were determined by inductively coupled plasma mass spectroscopy (ICP-MS) using phosphoric acid 2-ethylhexyl ester solvent extraction, which had been established for seawater analysis. First, the limestone sample was divided into two fractions: acetic acid soluble (carbonate fraction) and insoluble (residue). A modification of the method was undertaken to achieve quantitative recovery. With this method most of the REEs in the carbonate fraction were quantitatively recovered, except for the heaviest three REEs (Tm, Tb and Lu). The reason for the poor recoveries of the three elements was investigated, but still remained unclear. The mass-spectroscopic interference of BaO with Eu made an accurate determination of both lighter REEs and Eu at the same time impossible. The precision of this method was better than 20%. The data adopted after analytical consideration were consistent with those previously reported.

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