Summary
A fast and selective method has been developed for the extraction of tellurium(IV) with mesityl oxide. Tellurium(IV) is quantitatively extracted by pure mesityl oxide from 2.5–3M hydrochloric acid solutions. After stripping with water, it is determined nephelometrically as the bluish sol. The extracted species probably has the composition TeCl4 · 2MeO. The optimum period of equilibration is 30 seconds. Tellurium can be extracted and determined in the presence of a large excess of selenium, silver, bismuth, lead, copper and nickel which are associated with it in minerals.
Zusammenfassung
Ein schnelles und selektives Verfahren zur Extraktion von Tellur(IV) mit Mesityloxid wurde ausgearbeitet. Aus 2,5- bis 3-m Salzsäure gelingt diese Extraktion quantitativ. Nach Waschen mit Wasser wird das bläuliche Sol nephelometriert. Die extrahierte Substanz hat vermutlich die Zusammensetzung TeCl4 · 2MeO. Die Gleichgewichtseinstellung erfolgt in 30 sec. Tellur kann so in Gegenwart eines großen Überschusses von Se, Ag, Bi, Pb, Cu und Ni bestimmt werden, mit denen es in Mineralen vergesellschaftet ist.
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Dhond, P.V., Khopkar, S.M. Solvent extraction of tellurium (IV) with mesityl oxide. Direct nephelometric determination. Mikrochim Acta 62, 721–727 (1974). https://doi.org/10.1007/BF01218212
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DOI: https://doi.org/10.1007/BF01218212