Abstract
A complexometric method is proposed for the determination of small amounts of tellurium (50–350μg). It is based on the reaction between Te(IV) and diethyldithiocarbamic acid (DDTC). The compound of the composition Te(DDTC)4 obtained is extracted with CCl4 at pH 8.7–8.8. The yellow organic extract is shaken with copper(II)-ammonia solution, ph 11. The organic phase, containing Cu(DDTC)2 is then shaken with silver-ammonia solution. The Cu(II)-ions pass into the aqueous phase where they are titrated with 0.002M EDTA, using glycinethymol blue as indicator. Selenium(IV) does not interfere.
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