| Assay (iodometric) |
99.7 - 100.5 % |
| Identity (IR-spectrum) |
conforms |
| Appearance |
white or almost white, cristalline powder |
| Appearance of solution (50 g/l CO₂-free water) |
clear (≤ 3 NTU) and not so intense in colour than reference solution BY₇ |
| pH (50 g/l CO₂-free water) |
2.1 - 2.6 |
| Spec. rotation [α²0/D (100 g/l, water) |
+20.5 - +21.5 ° |
| Chloride (Cl) |
≤ 50 ppm |
| Sulphate (SO₄) |
≤ 20 ppm |
| Cu (Copper) |
≤ 5 ppm |
| Fe (Iron) |
≤ 2 ppm |
| Heavy metals (as Pb) |
≤ 10 ppm |
| Oxalic acid |
≤ 0.2 % |
| Related 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 % |
