Potassium Tellurite
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(Potassium Tellurate IV), K2TeO3 253.79 CAS RN®: 7790-58-1.—White, granular powder. Soluble in water. Its solution is alkaline.
Assay: Weigh accurately about 120 mg, transfer to a beaker, and dissolve in a mixture of 10 mL of nitric acid, 10 mL of sulfuric acid, and 25 mL of water. Heat to boiling, and boil until copious fumes of sulfur trioxide are evolved. Cool, cautiously add 100 mL of water, heat to boiling, add 6g of sodium fluoride, and titrate the hot solution with 0.1 N potassium permanganate VS. Each mL of 0.1 N potassium permanganate is equivalent to 12.69 mg of K TeO . Not less than 98% is found.
Chloride (Reagent test): One g shows not more than 0.1 mg of Cl (0.01%).
