Appearance

White powder

Assay

98.0% -101.0%

Melting point

260’C min.

Identification

Acidity or alkaline

Positive

Pass

Solution appearance

Pass

Related substances

0.5% max

Chloride

100ppm Max

Sulfate

200ppm Max

Heavy metals

Loss on drying

Sulfate ash

10ppm Max

0.5% max.

0.1% max

Appearance

White powder

PH transition interval

8.0(colorless)-10 (dark purple-red)

Mass-absorption coefficient (L/cm.g)

68.5-75.0

Ethanol soluble test

Qualified

Residue on ignition ( as sulfate)

0.05% min.

Loss on drying

1.0% min