Assay (alkalimetric): ≥ 99.0 %

Assay (alkalimetric, calculated on dried substance): 98.5 - 101.0 %

Identity: passes test

Appearance of solution: passes test

Insoluble matter: ≤ 0.01 %

pH-value (5 %; water; 25 °C): 5.2 - 8.0

Acidity or alkalinity: passes test

Chloride (Cl): ≤ 0.0003 %

Phosphate (PO₄): ≤ 0.0005 %

Total nitrogen (N): ≤ 0.0003 %

Heavy metals (as Pb): ≤ 0.0003 %

As (Arsenic): ≤ 0.0001 %

Ca (Calcium): ≤ 0.002 %

Fe (Iron): ≤ 0.0005 %

K (Potassium): ≤ 0.002 %

Mg (Magnesium): ≤ 0.001 %

Loss on drying (130 °C): 52.0 - 57.0 %

corresponds to ACS,Reag. Ph Eur