Appearance

White to off-white crystalline powder

Identification

A:infrared absorption

 

B:the R,value of the principal spot in the thin-layer chromatogram of chormatographic purity corresponds to that obtained from standard solution A

 

C:dissolve about 1g in 15ml of ammonium hydroxide and 15ml of water in a 50ml volumetric flask,dilute with water to volume,and mix;the solution so obtained responds to the tests for silver

Loss on drying

≤0.5%

Limit of nitrate

≤0.1%

Chromatographic purity

No secondary spot in the chromatogram of the test solution is greater or more intense than the principal spot obtained from standard solution B(1.0%)

 

The sum of all secondary spots observed is not greater than 2.0%

Silver content

29.3-30.5%

Assay

98.0-102.0%

Particle size

The average particle size is not greater than 10μm and the size of not more than 10% of the particles is greater than 40μm