Item

Standard

Appearance

White, crystalline powder or colorless cyrstals

Identification

IR, Characteristic Reaction and Test of chlorides

Assay

98.5 - 101.0

pH

2.7 - 3.3

Absorbance of solution

≤ 0.025

Solubility

Freely soluble in water, soluble in glycerol, slightly soluble in alcohol

Appearance of solution

Clear and not more than Y7

Sulphates

≤ 300 ppm

Limit of nitrate

No brown ring is produced

Heavy metals

≤ 20 ppm

Related substances

Any impurity % ≤ 0.4

Water

≤ 5.0

Sulphated ash/Residue on ignition

≤ 0.1

Chromatographic purity

≤ 1.0