Studies on the Determination of Tellurium and Selenium. II : Determination of Tellurium and Selenium in Presence of Sulfuric Acid with Sulfur Dioxide

Tellurium was precipitated quantitatively with sulfur dioxide from the hydrochloric acid solution of 2N even in the presence of 5 ml of sulfuric acid in the total volume of 100ml, but not in a higher concentration than 9N of the hydrochloric acid. Selenium was precipitated quantitatively under the same condition as in the case of tellurium, when the hydrochloric acid concentration was higher than 4 N. Therefore, the separation of tellurium and selenium would be possible also in the presence of sulfuric acid, when selenium was precipitated in a higher concentration than 9N of hydrochloric acid and tellurium was precipitated from the filtrate after diluting the filtrate to 2 N of the acid