Spectrophotometric determination of tin(IV) by extraction of the ternary tin/iodide/5,7-dichloro-8-quinolinol complex |
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Authors: | AM Gutierrez MV Laorden A Sanz-Medel JL Nieto |
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Institution: | Departamento de Química Analítica, Facultad Ciencias Químicas, Universidad Complutense, 28040-Madrid Spain;Instituto Estructura de la Materia, Consejo Superior de lnvestigaciones Científicas, Serrano 119, 28006-Madrid Spain |
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Abstract: | The characteristics of the ternary complexes formed by fluoride, bromide, iodide and thiocyanate with tin(IV) and 5,7-dichloro-8-quinolinol (HCQ) have been studied. A spectrophotometric method is proposed for the determination of tin(IV) (1–20 μg ml?1), based on the extraction into chloroform of the tin/iodide/HCQ complex. Aluminium, bismuth and lead do not interfere, but antimony, copper, iron(III) and fluoride do. Copper and iron can be eliminated by preliminary extraction in the absence of iodide. |
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