Ion-pair extraction and fluorimetric determination of ultratraces of strontium with cryptand 2.2.2 and eosin |
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Authors: | Domingo Blanco Gomis Enrique Fuente Alonso Pilar Arias Abrodo |
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Institution: | (1) Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, E-33006 Oviedo, Spain |
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Abstract: | A highly sensitive and selective fluorimetric determination of strontium is proposed, based on solvent extraction of the ion-pair formed between the cationic complex of Sr2+ with cryptand 2.2.2 and eosinate as counter ion. A linear working range from 0.7 ng/ml (limit of detection) to 500 ng/ml of strontium and a relative standard deviation of 3.5% at the 100 ng/ml level are obtained. The metal: ligand: counter ion molecular ratio in the extracted mononuclear ion-pair is 1 1 1. The equilibrium constants involved in the extraction process were calculated. |
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Keywords: | strontium cryptand 2 2 2 fluorimetric determination ion-pair extraction |
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