Appearance | white to light grey, cryst. powder |
Assay (iodom.) | ≥99 % |
pH value (0,1 M, H2O) | 4.0-6.5 |
Solution (10 % in H2O) | clear, colourless |
Oxidized part | ≤0.2 % |
Melting point | 38-44 °C |
Heavy metals (as Pb) | ≤0.0001 % |
Absorbance | |
260 nm | ≤0.4 |
280 nm | ≤0.2 |