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
