Abstract
An ion-chromatographic procedure is described for the determination of Mg, Ca and Sr in the presence of an excess of Ba in baryte samples after a soda-potash digestion. The procedure is performed by coupling a strong acid exchanger (based on silica gel) and a post-column derivatisation using PAR-Zn-EDTA reagent and photometric detection at 495 nm. Further optimizations resulted in a mobile phase consisting of a citrate-oxalate-ethylendiamine solution. Details of the optimization procedures and the results of some baryte analyses are presented. The concentrations of Mg, Ca and Sr ranged between 0.01 and 2%. These results were verified using two reference methods (AAS and complexometric titration).
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