Assay (alkalimetric): ≥ 99.0 %

Assay (alkalimetric, calculated on dried substance): 98.0 - 100.5 %

Assay (alkalimetric; dried substance): ≥ 99.5 %

Identity: passes test

Appearance of solution: passes test

Insoluble matter: ≤ 0.01 %

pH-value (5 %; water, 25 °C): 4.2 - 4.5

Chloride (Cl): ≤ 0.0005 %

Sulfate (SO₄): ≤ 0.003 %

Total nitrogen (N): ≤ 0.001 %

Heavy metals (as Pb): ≤ 0.0010 %

Heavy metals (ACS): ≤ 0.001 %

As (Arsenic): ≤ 0.0002 %

Fe (Iron): ≤ 0.0010 %

Na (Sodium): ≤ 0.005 %

Reducing substances: passes test

Loss on drying (130 °C): ≤ 0.2 %

Corresponds to ACS,ISO,Reag. Ph Eur