Test Item

Specification

Appearance

A white or almost white crystalline powder

solubility

Sparingly soluble in water, freely soluble in alcohol; very slightly soluble in methylene chloride

Identification(a)

melting point:168-172ºC

Identification(c)

The infra-red spectrum conforms to that of the reference standard

Related Substances

ImpurityJ:4-Chloroacetanilide≤10ppm
ImpurityK:4-Aminophenol≤50ppm
ImpurityF:4-Nitrophenol≤0.05%
Any other impurity:≤0.05%
Total of other impurities:≤0.1%

Loss on drying

≤0.5%

sulfated ash

≤0.1%

Assay

99.0-101.0%