Item

Specifications

Appearance

White or almost white needle, crystals or powder

Odor

almost no odor

Assay(by HPLC)

≥99.00%

Identification

(1)Triturate sample with an equal amount of camphor; the mixture liquefies.

(2)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.

(3)add 5ml of a solution of sodium hydroxide (1→10) to 1g sample. And heat on a water bath. a colorless or light yellow liquid is available. And add 2 to 3 drops of chloroform to this liquid. while warm,shake it. a yellow-green color develops.

(4)The sample solution exhibits a maximum absorbance at the wavelength at 279+2 nm.

Melting point

110~113℃

Clarity of solution

dissolve 3.0g sample in 10ml of ethanol; the solution is clear.

Heavy metals (Pb)

≤20.0PPM

Arsenic

≤2.0PPM

Organic impurities  (TLC)

None detected