Specification Test Results

• Assay:
  Min. 99.7 %
• Substances reducing KMnO₄ (as O):
  Passes test
• Substances coloured by H₂SO₄:
  Passes test
• Melting point:
  121 - 123 °C
• Heavy metals (as Pb):
  Max. 5 ppm
• Insolubility in absolute ethanol:
  Max. 50 ppm
• Insolubility in diluted ammonia:
  Max. 50 ppm
• Insolubility in NaOH 1 N:
  Max. 50 ppm
• Ignition residue (SO₄):
  Max. 100 ppm
• Total Cl (Chlorine):
  Max. 50 ppm
• Water:
  Max. 0.3 %
• SO₄ (Sulphate):
  Max. 30 ppm
• Fe (Iron):
  Max. 5 ppm