Specification Test Results

• Assay:
  Min. 99.0 %
• Loss on drying (105°C, 2 h):
  Max. 0.2 %
• pH (5 %, 25 °C):
  4.1 - 4.5
• Water insoluble matter:
  Max. 0.01 %
• Iron (Fe):
  Max. 0.002 %
• Sodium (Na):
  Max. 0.005 %
• Heavy metals (as Pb):
  Max. 0.001 %
• Chloride (Cl):
  Max. 0.001 %
• Sulfate (SO₄):
  Max. 0.003 %
• pKa (25 °C):
  (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)