Assay (complexometric; calculated on dried substance): 98.5 - 100.5 %

Identity: passes test

Substances insoluble in acetic acid: ≤ 0.2 %

Substances insoluble in hydrochloric acid: ≤ 0.005 %

Chloride (Cl): ≤ 0.005 %

Sulfate (SO₄): ≤ 0.03 %

Heavy metals (as Pb): ≤ 0.002 %

Total nitrogen (N): ≤ 0.001 %

Al (Aluminium): ≤ 0.005 %

As (Arsenic): ≤ 0.0004 %

Ba (Barium): passes test

Cu (Copper): ≤ 0.0005 %

Fe (Iron): ≤ 0.001 %

K (Potassium): ≤ 0.005 %

Mg (Magnesium): ≤ 0.02 %

Na (Sodium): ≤ 0.2 %

Pb (Lead): ≤ 0.0005 %

Sr (Strontium): ≤ 0.1 %

Magnesium and alkali metals: ≤ 1.5 %

Particle size (d 50): about 14 µm

Loss on drying (200 °C): ≤ 1.0 %

Corresponds to Reag. Ph Eur