Specification Test Results

• Assay (calculated to the dried substance):
  99.0 - 101.0 %
• Loss on drying (130°C):
  39.0 - 40.5 %
• pH (5 %, 25 °C):
  7.5 - 9.0
• Water insoluble matter:
  Max. 0.05 %
• Free alkali (as Na₂CO₃):
  Max. 0.05 %
• Aluminium (Al):
  Max. 0.2 ppm
• Arsenic (As):
  Max. 2 ppm
• Calcium (Ca):
  Max. 20 ppm
• Calcium, Magnesium:
  complying
• Copper (Cu):
  Max. 0.001 %
• Iron (Fe):
  Max. 10 ppm
• Mercury (Hg):
  Max. 1 ppm
• Potassium (K):
  Max. 0.02 %
• Magnesium (Mg):
  Max. 20 ppm
• Lead (Pb):
  Max. 2 ppm
• Zinc (Zn):
  Max. 0.001 %
• Heavy metals (as Pb):
  Max. 10 ppm
• Chloride (Cl):
  Max. 50 ppm
• Sulfate (SO₄):
  Max. 50 ppm
• KMnO₄ reducing matter (as HCOOH):
  Max. 0.1 %
• KMnO₄ reducing matter (as O):
  Max. 0.002 %
• Formic acid, formiates other impurities (HCOOH):
  Max. 1000 ppm
• Appearance of the solution:
  complying
• Reducing impurities:
  complying
• Residual solvents:
  complying