1. Reversed-phase chromatography of alkali metals and alkaline earths on paper treated with di-(2-ethylhexyl) orthophosphoric acid in acetate medium
- Author
-
E. Cerrai and G. Ghersini
- Subjects
Molar concentration ,Cesium ,Acetates ,Lithium ,Biochemistry ,Phosphates ,Analytical Chemistry ,chemistry.chemical_compound ,Acetic acid ,Column chromatography ,Magnesium ,Phosphoric Acids ,Phosphoric acid ,Ions ,Chromatography ,Chromatography, Reverse-Phase ,Metals, Alkali ,Elution ,Research ,Sodium ,Organic Chemistry ,Extraction (chemistry) ,General Medicine ,Reversed-phase chromatography ,Rubidium ,Alkali metal ,Calcium, Dietary ,chemistry ,Barium ,Strontium ,Potassium ,Calcium ,Beryllium - Abstract
The chromatographic behaviour of alkali and alkaline earth metals on paper treated with di(2-ethylhexyl) phosphoric acid (HDEHP) has been investigated, using acetic acid as the eluent in the range of concentrations from 2 M to 0.01 M . The quantity (1/ RinF — 1) has been related to the hydrogen ion concentration and to the effective HDEHP concentration on the paper. A behaviour similar to that show in liquid—liquid extraction with HDEHP solutions was found, provided that the acetic acid concentration was kept low. The peculiar behaviour shown with concentrated acetic acid has been discussed. No direct proportionality has been obtained between the HDEHP molarity in the solution used to treat the paper and the effective concentration of HDEHP on the paper which acts during elution. The instability of HDEHP on paper with very concentrated acetic acid has been also investigated. Some chromatographic separations of alkali and alkaline earth metals have been carried out, and others have been suggested.
- Published
- 1964