Assay (iodometric)99.0 - 100.5 %Identity (IR-spectrum)conformsAppearancewhite or almost white, cristalline powderAppearance of solution (50 g/l CO₂-free water)clear (≤ 3 NTU) and not so intense in colour than reference solution BY₇pH (50 g/l CO₂-free water)2.1 - 2.6Spec. rotation [α²0/D (100 g/l, water)+20.5 - +21.5 °Chloride (Cl)≤ 50 ppmSulfate (SO₄)≤ 20 ppmCu (Copper)≤ 5 ppmFe (Iron)≤ 2 ppmHeavy metals (ACS)≤ 10 ppmOxalic acid≤ 0.2Related substances (HPLC) (Impurity C)≤ 0.15 %Related substances (HPLC) (Impurity D)≤ 0.15 %Related substances (HPLC) (unspecified impurities singly)≤ 0.10 %Related substances (HPLC) (sum of impurities (except impurity A and D))≤ 0.2 %Sulfated ash (600 °C)≤ 0.05 %Loss on Drying (105 °C)≤ 0.1 %