| Assay (acidimetric, calculated on dried substance) |
99.0 - 101.0 % |
| Identity (IR-spectrum) |
passes test |
| Appearance |
white to almost white, fine-crystalline powder or colorless crystals |
| Appearance of solution (50 g/l; water) |
clear and colorless |
| Spec. rotation (α 20/D, 110 g/l, hydrochloric acid 120 g/l, calc. on dried substance) |
+11.4 to +12.4 |
| Chloride (Cl) |
≤ 200 ppm |
| Sulfate (SO₄) |
≤ 200 ppm |
| Heavy metals (as Pb) |
≤ 10 ppm |
| As (Arsenic) |
≤ 5 ppm |
| Ca (Calcium) |
≤ 10 ppm |
| Co (Cobalt) |
≤ 5 ppm |
| Fe (Iron) |
≤ 5 ppm |
| K (Potassium) |
≤ 5 ppm |
| Mg (Magnesium) |
≤ 5 ppm |
| Na (Sodium) |
≤ 100 ppm |
| Zn (Zinc) |
≤ 5 ppm |
| Ninhydrin-positive substances (LC) (any ninhydrin-positive impurity) |
≤ 0.2 % |
| Ninhydrin-positive substances (LC) (ammonium (570 nm)) |
≤ 0.02 % |
| Ninhydrin-positive substances (LC) (total impurities) |
≤ 0.5 % |
| Loss on drying (105 °C; 3 h) |
≤ 0.2 % |
