Assay (complexometric): ≥ 99.0 %
Substances insoluble in dilute hydrochloric acid: ≤ 0.03 %
Chloride (Cl): ≤ 0.025 %
Sulfate (SO₄): ≤ 0.005 %
Total nitrogen (N): ≤ 0.005 %
Cd (Cadmium): ≤ 0.0001 %
Cu (Copper): ≤ 0.0005 %
Fe (Iron): ≤ 0.01 %
Pb (Lead): ≤ 0.0005 %
Zn (Zinc): ≤ 0.0005 %
Substances not reducing by formic acid (Residue on ignition, as sulfate): ≤ 0.025 %



