Abstract
The solvent extraction of tin(IV) from chloride media withtris(2-ethylhexyl)phosphate is presented. Tin(IV) is extracted quantitatively from 2.75–3.20 mol dm−3 hydrochloric acid using 6.38–6.91 mol dm−3tris(2-ethyl-hexyl)phosphate dissolved in toluene as an extractant. After back-extraction of tin(IV) with water from thetris(2-ethylhexyl)phosphate phase, it is estimated spectrophotometrically following complexation with pyrocatechol violet. The recommended range for determination of tin(IV) is 10–100 μg. The probable extracted species is SnCl4·2TEHP. The method is applicable to the analysis of alloy samples with a detection limit of 0.4 μg/ml (for 10 μg of tin) and a relative standard deviation between 0.21–0.32%.
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