Zinc, Activated
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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)
—Place zinc pellets in a conical ask, and add a sucient quantity of a 50-ppm solution of chloroplatinic acid to cover all pellets. Allow the metal to remain in contact with the solution for 10 min, drain, wash, and dry immediately.
Assay: To 5 g of activated zinc add 15 mL of hydrochloric acid, 25 mL of water, 0.1 mL of stannous chloride solution (235 mg/mL in hydrochloric acid), and 5 mL of potassium iodide solution (166 mg/mL in water). No stain is produced when in contact with mercuric bromide paper. Repeat the test for arsenic, using the same reagents and adding a solution containing 1 µg of arsenic. An appreciable stain appears when in contact with mercuric bromide paper.
