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High performance centrifugal partition chromatographic separation of alkaline earth metal ions with bis‐2‐ethylhexylphosphinic acid
Author(s) -
Nagaosa Yukio,
Wang Tao
Publication year - 2003
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200301369
Subject(s) - chemistry , chromatography , elution , partition coefficient , aqueous solution , metal ions in aqueous solution , absorbance , metal , analytical chemistry (journal) , organic chemistry
The mutual separation of Ca(II), Mg(II), Sr(II), and Ba(II) was studied by high performance centrifugal partition chromatography using 0.16 M bis‐2‐ethylhexylphosphinic acid in heptane as a stationary phase. Two‐step elution of the four metal ions loaded was accomplished with aqueous chloroacetic acid mobile phases (pH 6.50 and 5.30). Ethanol (5%) was added to the pH 6.50 mobile phase for the separation of Sr(II) and Ba(II). The chromatographic conditions were 2,136 partition channels, 800 rpm rotational speed, and 1.5 cm 3 /min flow rate. The elution curve was obtained by monitoring the absorbance of each metal complex post‐labeled with a chromogenetic agent.