Testing   Item

Standard

Result

Assay

99.0%-100.5%

99.72%

Appearance

White or almost White

crystals Crystalline   Powder

pass

Solubity

Easily   soluble in water

pass

Identification

Positive   Reaction

Positive

Melting   Point

About 190ºC

190.6   ºC

Copper

≤5ppm

<5ppm

Heavy   Metals

≤10ppm

<10ppm

Mercury

≤0.1mg/kg

<0.1mg/kg

Lead

≤2mg/kg

<2mg/kg

Arsenic

≤3ppm

<3ppm

Oxalic   Acid

≤0.2%

<0.2%

Iron

≤2ppm

<2ppm

Cadmium(Cd)

<1mg/kg

<1mg/kg

Impurity   E

≤0.2%

<0.2%

Loss   on Drying

≤0.4%

<0.4%

Sulphate   Ash(Residue On Ignition)

≤0.1%

<0.1%

Specific   Optical Rotation

+20.5°-+21.5°

21.08°