Abstract
Some kinds of organophosphorus compounds were compared for the separation of calcium (II), magnesium (II), strontium (II), and barium (II), in aqueous media by continuous high performance centrifugal partition chromatography (HPCPC). Among extractants investigated, bis‐2‐ethylhexylphosphinic acid (BEHPA) showed the most selective reagent for the extraction and separation of the four alkaline earth metal ions. Well‐defined HPCPC separation of the four metal ions, therefore, was performed by using a heptane solution of BEHPA as a stationary phase. The mobile phases used were 0.1 M chloroacetic acid solutions (pH 5.30 and 6.50) containing 5% ethanol. The HPCPC system was operated with 2136 partition channels, at a rotational speed of 800 rpm, and at a flow rate of 1.5 cm3/min.
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