Characteristics

White or almost White crystals Crystalline Powder

Identification

Positive Reaction

Melting point

About 190ºC

PH(5% water in solution)

2.1-2.6

PH(2% water in solution)

2.4-2.8

Clarity of Solution 

Clear

Colour of Solution

≤ BY7

Copper

≤5ppm

Heavy Metals

≤10ppm

Mer

≤0.1mg/kg

Lead 

≤2 mg/kg

Iron

≤2ppm

Arsen

≤3ppm

Cad(Cd)

<1mg/kg

Oxalic Acid

≤0.2%

Impurity E

≤0.2%

Loss on Drying

≤0.4%

Sulphate Ash(Residue On Ignition)

≤0.1%

Specific Optical Rotation

+20.5 °~ +21.5 °

Residual Solvents 

Pass 

Assay

99.0%- 100.5%