Chromatographic separation of alkaline earth metals using alpha-hydroxyisobutyric acid Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cc08hk20t

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  • A systematic study of the elution of magnesium and calcium from Dowex 50 X 8 resin using α-hydroxyisobutyric acid (α-HIBA) at various pH values and concentrations, indicated that the difference in the equilibrium distribution coefficients of these two elements was large enough for a good separation. This fact was applied to develop a chromatographic procedure for the separation of milligram quantities of magnesium, calcium, strontium, and barium. After magnesium was eluted with 0. 22M α-HIBA at pH 4.5, the three remaining elements were eluted by varying the concentration and pH of α-HIBA during the course of the elution (exponential gradient elution). After its respective elution, each alkaline earth metal was directly determined by atomic absorption spectroscopy. Using this method, several successful analyses of synthetic samples (similar to the composition of sea water) were performed. Yield determinations of the alkaline earth metals from these analyses were consistently greater than 93%, with the overall average yield being 98%.
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