Triphenylmethane
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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)
C19H16 244.34 CAS RN®: 519-73-3.—Light brown powder.
Assay: Inject an appropriate volume into a gas chromatograph (see Chromatography 〈621〉) equipped with a flame-ionization detector, helium being used as the carrier gas. The following conditions have been found suitable: a 0.25-mm × 30-m capillary column coated with a 1-μm layer of phase G2; the injection port temperature is maintained at 300°; the detector temperature is maintained at 300°; and the column temperature is maintained at 200° and programmed to rise 10° per minute to 300°. The area of the C19H16 peak is not less than 99% of the total peak area.
Melting Range 〈741〉: between 92° and 94°.
