Description

Practically odorless, white to off-white powder

Identification
•  I.R
•  Colour test
•  HPLC

Concordant with WS. On heating, Violet vapour evolves The retention time of the major peak in the chromatogram of the sample solution corresponds to that observed in the chromatogram of the S.S.solution

Specific Rotation
(40% solution in water)

- 4.6°~ - 5.2°

Loss on drying

Not more than 0.5%

Residue on ignition

Not more than 0.1%

Free Aromatic Amine

Not more than 200 ppm

Free Iodine

No red colour

Free Iodide

Not more than 0.001%

Free Acid or Alkali

Acid not more than 5mg of HCL equivalent.
Alkali not more than 3mg of NaOHequivalent

Heavy metals

Not more than 0.001%

Related compounds byHPLC Total impurities

Not more than 0.25%

Assay (on dry basis)

98.0% ~ 101.0%