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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 (0.5 ng ml−1) to 450 ng ml−1 of strontium and to 100 mg ml−1 of calcium was obtained. The relative standard deviation was 3.5% -2.9.%. The proposed method has been applied sucessfully to the determination of trace amounts of strontium and calcium in sugar and chemicals.
