Assay (acidimetric; dried substance): 99.7 - 100.5 %

Assay (acidimetric): ≥ 99.5 %

Insoluble matter: ≤ 0.01 %

Chloride (Cl): ≤ 0.001 %

Phosphate (PO₄): ≤ 0.0005 %

Phosphate and Silicate (as SiO₂): ≤ 0.001 %

Sulfate (SO₄): ≤ 0.001 %

Total sulfur (as sulfate): ≤ 0.003 %

Total nitrogen (N): ≤ 0.001 %

Heavy metals (as Pb): ≤ 0.0005 %

Al (Aluminium): ≤ 0.0005 %

Ca (Calcium): ≤ 0.0005 %

Fe (Iron): ≤ 0.0005 %

Mg (Magnesium): ≤ 0.001 %

Na (Sodium): ≤ 0.02 %

NH₄ (Ammonium): ≤ 0.0005 %

Corresponds to ACS