p-Xylene
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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)
C8H10 106.17 CAS RN: 106-42-3.-Colorless liquid.
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 x 30-m capillary column coated with a 1-µm layer of phase G14; the column temperature is maintained at 50° and programmed to rise 10° per minute to 100°; the injection port is maintained at 130°; and the detector is maintained at 300°. The area of the C8H10 peak is not less than 99% of the total peak area.
REFRACTIVE INDEX (831): between 1.493 and 1.497 at 20°.
