ß-Naphthoquinone-4-sodium Sulfonate
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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)
C10H5NaO5S 260.20—Yellow to orange-yellow crystals or crystalline powder. Soluble in about 10 parts of water; insoluble in alcohol.
Loss on Drying 〈731〉: Dry it in vacuum at about 50°: it loses not more than 2.0% of its weight.
Residue on Ignition (Reagent test): Ignite 1 g of dried sample with 3 mL of sulfuric acid: the residue weighs between 265 and 280 mg (between 26.5% and 28.0%).
