Abstract
A spectrofluorimetric method for the determination of ultratrace amounts of strontium and calcium is described based on the sequential extraction of the ternary ion-association complexes formed between the cation, a cryptand as the ligand and eosin as a counter ion. A linear working range from the detection limit to 450 ng ml{sup {minus}1} of strontium and to 100 ng ml{sup {minus}1} of calcium was obtained. The relative standard deviation was 3.5% - 2.9%. The proposed method has been applied successfully to the determination of trace amounts of strontium and calcium in sugar and chemicals.
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