Assay (complexometric): ≥ 99.5 %

Assay (complexometric; calculated on dried substance): 99.0 - 100.5 %

Identity: passes test

Appearance of solution: passes test

Insoluble matter: ≤ 0.005 %

Acidity or alkalinity: passes test

pH-value (5 %; water; 25 °C): 5.0 - 8.0

Chloride (Cl): ≤ 0.0003 %

Total nitrogen (N): ≤ 0.002 %

Nitrate (NO₃): ≤ 0.002 %

Heavy metals (ACS): ≤ 0.0005 %

As (Arsenic): ≤ 0.0002 %

Ca (Calcium): ≤ 0.005 %

Cu (Copper): ≤ 0.0001 %

Fe (Iron): ≤ 0.0001 %

K (Potassium): ≤ 0.001 %

Mn (Manganese): ≤ 0.0005 %

Na (Sodium): ≤ 0.001 %

NH₄ (Ammonium): ≤ 0.002 %

Pb (Lead): ≤ 0.0001 %

Sr (Strontium): ≤ 0.005 %

Loss on drying (400 °C): 48.0 - 52.0 %

Corresponds to ACS, Reag. Ph Eur