| 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 % |
