Abstract
Tellurium is precipitated quantitatively with sulphur dioxide from the solution of 2 N hydrochloric acid containing 5ml of sulphuric acid in which the total volume is 100ml and is not precipitated if the concentration of hydrochloric acid exceeds 9 N. Selenium is precipitated quantitatively in the same condition as tellurium if the concentration of hydrochloric acid exceeds 4 N. Therefore the separation of selenium and tellurium is possible in the presence of sulphuric acid when selenium is precipitated in a concentration more than 9 N of hydrochloric acid and tellurium is precipitated from the filtrate after dilution of filtrate to 2 N of hydrochloric acid.
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