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Assay (iodometric): ≥ 99.0 %
Insoluble matter: ≤ 0.01 %
pH-value (5 %; water): 3.0 - 3.8
Sulfate (SO₄): ≤ 0.005 %
Nitrate (NO₃): ≤ 0.015 %
Total nitrogen (N): ≤ 0.003 %
As (Arsenic): ≤ 0.0001 %
Ca (Calcium): ≤ 0.005 %
Fe (Iron): ≤ 0.003 %
K (Potassium): ≤ 0.01 %
Na (Sodium): ≤ 0.02 %
Ni (Nickel): ≤ 0.001 %
Pb (Lead): ≤ 0.004 %
Corresponds to ACS, Reag. Ph. Eur.
