Item

Standard

Appearance

White crystals or crystalline powder

Specific rotation[α]20/D(C=4,H2O)

+25.8 to 27.0°

State of solution

(Transmittance)

Clear and colorless

Chloride (Cl)

Not more than 0.020%

Ammonium (NH4)

Not more than 0.02%

Sulfate (SO4)

Not more than 0.020%

Iron (Fe)

Not more than 10ppm

Heavy metal(Pb)

Not more than 10ppm

Arsenic(As2O3)

Not more than 1ppm

Loss on drying

Not more than 0.20%

Residue on ignition(sulfated)

Not more than 0.10%

Assay

98.5 to101.0%

pH

2.0 to 3.5

Ninhydrin positive substance

negative