Items

USP26

EP

GB

Identification

IR

IR or Chemical Method

IR or Chemical Method

pH (5%water solution)

5.5 ~ 9.5

6.5 ~ 8.5

5.5 ~ 9.5

Specific rotation

-29o ~ -32o

-29o ~ -32o

-29o ~ -32o

Water content

≤4%

≤1%

≤4%

Content

97 ~ 103%

98 ~ 102%

97 ~ 103%

Sodium

≤0.1%

 ≤0.1%

Potassium

≤0.2%

Heavy metal (Pb)

≤0.002%

≤0.001%

≤0.001%

Arsenic

≤0.0002%

≤0.0002%

Chloride

≤0.40%

≤0.20%

≤0.40%

Residue on ignition

≤0.5%

Cyanamid

Non detectable

Appearance of solution

Clear and colorless 

Related substances
(HPLC)

Impurity A ≤0.5%

Other impurity ≤0.1%