Item

Standard

Appearance

White crystals or crystalline powder

State of solution

(Transmittance)

Clear and colorless

Not less than 95.0%

Chloride (Cl)

Not more than 0.04%

Ammonium (NH4)

Not more than 0.02%

Iron (Fe)

Not more than 30ppm

Heavy metal(Pb)

Not more than 10ppm

Arsenic(As2O3)

Not more than 2ppm

Other amino acids

No spot

Loss on drying

Not more than 0.60%

Residue on ignition(sulfated)

Not more than 0.20%

Assay

98.0 to101.0%

pH

2.5 to 3.5