Appearance

Solid Crystal

Identification

A: Hcat about 500mgi in a test tube itllquefies and ammonia is evolved. Continue the heating until the liquid becomes turbid then cool. Dissolve the mass in a mixture of 10ml of water and 1ml of sodium hydroxide solution and I drop of cupric sulfate The solution acquires a reddish-violet color

B: Dissolve 100mg in 1ml of water and add 1ml of nitric acid a white crystalline precipitate of urea nitrate is formed

Test Items

Limit

Result

Bacterial endotoxins

Comply with the srandard

conform

Appearance:colourless,prism shaped crystalline or powder,no smell,salty taste

Confirms

Formula:CH4N2O

Identification A:The solution acquires a reddish-violet colour

Passes Test

Identification B:Dissolve 100mg in 1ml of water and add 1ml of nitric acid a white crystalline precipitate of urea nitrate is formed

Passes Test

Residue on ignition

≤0.1%

0.02%

Melting range

132C-135C

133C

Alcohol-insoluble matter

≤0.04%

0.012%

Ammonium

≤0.005%

0.003%

Chloride

≤0.007%

0.001%

Sulfate

≤0.01%

0.003%

Heavy metals

≤0.002%

0.001%

Loss on drying

≤0.5%

0.3%

Biuret

≤0.2%

0.11%

Assay

99.0%-100.5%

99.3%

Conclusion    the about product complies with Usp36.