| Item | Spec | Result | ||
| Characters | Appearance : white or almost white,crystalline powder. | White, crystalline powder | ||
| Solubility: sparingly soluble in water,freely soluble in Alcohol,very slightly soluble in methylene Chloride. | Sparingly soluble in water,freely soluble in Alcohol,very slightly soluble in methylene Chloride. | |||
| Identification | A: Melting range 168-172℃ | 169.7~170.5℃ | ||
| B.C.D.E Positive | B.C.D.E Positive | |||
| Related substances | Impurity J(chloracetanilide)≤10 ppm | ＜10ppm | ||
| Impurity K(4-aminophenol)≤50ppm | ＜50ppm | |||
| Impurity F(4-nitrophenol)≤0.05% | ＜0.05% | |||
| Any other impurity≤0.05% | ＜0.05% | |||
| Total of other impurities≤0.1% | ＜0.1% | |||
| Heavy metals | ≤0.002% | ＜0.002% | ||
| Residual solvent | Residual content of acetic acid≤0.5% | ＜0.14% | ||
| Loss on drying | ≤0.5% | 0.14% | ||
| Sulphate ash | ≤0.1% | 0.02% | ||
| Assay | 99.0-101.0%(Dried substance) | 100.1% | ||
