Assay (acidimetric; calculated on dried substance): ≥ 99.0 %

Assay (acidimetric): ≥ 99.0 %

Insoluble matter: ≤ 0.005 %

Chloride (Cl): ≤ 0.003 %

Phosphate (PO₄): ≤ 0.001 %

Silicate (SiO₂): ≤ 0.005 %

Total sulfur (as sulfate): ≤ 0.003 %

Total nitrogen (N): ≤ 0.001 %

Heavy metals (ACS): ≤ 0.0005 %

Ca (Calcium): ≤ 0.002 %

Cu (Copper): ≤ 0.0005 %

Fe (Iron): ≤ 0.0005 %

Mg (Magnesium): ≤ 0.001 %

Na (Sodium): ≤ 0.02 %

Pb (Lead): ≤ 0.0005 %

Substances precipitated by ammonia: ≤ 0.01 %

Loss on drying (300 °C): ≤ 1.0 %

Corresponds to ACS, ISO, Reag. Ph Eur