A new ion-exchange separation procedure is described for the isolation of Sr from Ca. It has been designed to give reproducible results with only approximately known reagent concentrations. Evaporation during storage is not critical and may easily be checked with a common pH paper. The medium is buffered by pyridine in the range pH 5-6. The pyridinium ion is demonstrated to be a weak ion with regard to cation exchange on a Biorad® AG50W X12 resin. This method is applied to the isolation of K, Rb and Sr in the isotopic analysis of silicate samples. Total procedural blanks for samples up to 500 mg are in the picomole range for Sr and in the tenth of a picomole range for Rb. © 1986.
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