期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1180, 期 1-2, 页码 59-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.12.008
关键词
lanthanide separation; anion-exchange chromatography; ethylenediaminetetraacetic acid; ICP-MS
Rare earth elements (REEs) form anionic complexes which can be separated isocratically by anion-exchange chromatography using ethylenediaminetetraacetic acid (EDTA) as the mobile phase. For easy detection and identification, inductively coupled plasma (ICP) MS was used as detection method. From pH 3.5 to 7.5, retention increases from La to Sm and then decreases again up to Lu. Above pH 8.5, the retention of the light lanthanides increased drastically. It seems that the stoichiometry and the charge of the REE-EDTA complexes change with the elution pH. This strange elution behaviour can be easily tuned for particular applications by selecting the elution pH. For example, at pH values between 5.5 and 7.5 most isobaric and polyatomic interferences which occur in ICP-MS detection of the lanthanides are eliminated. A mechanism for the stepwise formation of the REE-EDTA complexes as a function of pH is proposed. (c) 2007 Elsevier B.V. All rights reserved.
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