Index Item

Standard Value

Test Value

Appearance

Transparent colorless needle or Granule crystals

up to standard

HPLC Assay

≥99.0%

99.95%

Identification

Triturate sample with an equal amount of camphor, the mixture liquefies.

up to standard

Dissolve a small sample in 1ml of glacial acetic acid, add 6 drops of sulfuric acid and 1 drop of Nitric Acid, a red-brown color develops

up to standard

To 1g sample add 5ml of a solution of Sodium Hydroxide(1-10),and heat on a water bath, a colorless or light yellow liquid is obtained. To this liquid, add 2 to 3 drops of Chloroform, while warm, and shake, a yellow-green color develops.

up to standard

The sample solution exhibits a maximum absorbance at the wavelength at 279±2nm.

up to standard

Melting Point

110-113℃

110-111℃

Purity

Clarity of solution: Dissolve 3.0g sample in 10ml of ethanol: the solution is clear

up to standard

Organic impurities: TLC

up to standard

Heavy metal(Pb):20ppm max.

up to standard

Arsneic:2ppm max

up to standard