Nitroso R Salt
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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)
(1-Nitroso-2-naphthol-3,6-disodium Disulfonate), NOC10H4OH(SO3Na)2 377.26 CAS RN®: 525-05-3.—Yellow crystals or crystalline powder. One g dissolves in about 40 mL of water; insoluble in alcohol.
Sensitiveness: Dissolve 500 mg of sodium acetate in a solution of 0.4 mg of cobaltous chloride (0.1 mg of cobalt) in 5 mL of water. Add 1 mL of diluted acetic acid, and follow with 1 mL of a solution of the nitroso R salt (1 in 500): a red color, which is produced at once, persists when the solution is boiled with 1 mL of hydrochloric acid for 1 minute.
