Assay (iodometric): 99.5 - 101.0 %

Identity: passes test

Appearance of solution: passes test

Insoluble matter: ≤ 0.005 %

pH-value (5 %; water, 25 °C): 6.0 - 7.5

pH-value (10 %; water): 6.0 - 7.5

Chloride (Cl): ≤ 0.008 %

Sulfate and sulphite (as SO₄): ≤ 0.1 %

Sulfide (S): passes test

Heavy metals (as Pb): ≤ 0.001 %

Total nitrogen (N): ≤ 0.002 %

Ca (Calcium): ≤ 0.002 %

Cu (Copper): ≤ 0.0005 %

Fe (Iron): ≤ 0.0005 %

K (Potassium): ≤ 0.001 %

Mg (Magnesium): ≤ 0.001 %

Pb (Lead): ≤ 0.0005 %

Corresponds to ACS, ISO, Reag. Ph Eur