Abstract
The chromatographic behavior of beryllium, magnesium, calcium, strontium and barium was investigated on Whatman No. 1 paper impregnated with di- n-butyl phosphate (HDBP) as the stationary phase. Elution was performed with hydrochloric acid in a concentration range 1·10 −3–10 M. The chromatographic data obtained for Be 2+ and Ca 2+ were interpreted by means of plots of log (1/ R F — 1) vs. log [H+], or versus the amount of HDBP fixed on the paper. From these plots apparent stability constants for the formation of metal complexes were determined using a simple correlation between the liquid-liquid extraction coefficient and the (1/ R F — 1) function in reversed-phase partition chromatography. By a convenient choice of the concentration of hydrochloric acid in the mobile phase and that of HDBP in the stationary phase, separation of alkaline earths and their separation from other cations can be achieved.
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