Identity: passes test

Appearance of solution: passes test

Assay (alkalimetric, calculated on dried substance): 99.0 - 100.5 %

In water insoluble matter (calculated on dried substance): ≤ 0.15 %

pH-value (1 %, water): 4.1 - 5.0

pH-value (5 %; water): 4.2 - 4.5

Chloride (Cl): ≤ 0.0005 %

Fluoride (F): ≤ 0.001 %

Total nitrogen (as N): ≤ 0.001 %

Hydrogenphosphate (HPO₄): ≤ 0.5 %

Sulfate (SO₄): ≤ 0.01 %

Heavy metals (as Pb): ≤ 0.0005 %

Al, Ca and other elements detectable with ammonia: passes test

As (Arsenic): ≤ 0.00005 %

Ca (Calcium): ≤ 0.005 %

Cd (Cadmium): ≤ 0.0001 %

Co (Cobalt): ≤ 0.005 %

Cu (Copper): ≤ 0.005 %

Fe (Iron): ≤ 0.001 %

Hg (Mercury): ≤ 0.0001 %

K (Potassium): ≤ 0.005 %

Mg (Magnesium): ≤ 0.005 %

Ni (Nickel): ≤ 0.005 %

Pb (Lead): ≤ 0.0004 %

Zn (Zinc): ≤ 0.025 %

Substances reducing potassium permanganate (as O): passes test

Loss on drying (130 °C): 21.5 - 24.0 %

Corresponds to Reag. Ph. Eur.