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| grade | for HPLC |
| description | anhydrous |
| assay | ≥99.5% (T) |
| ≥99.5% | |
| pKa (25 °C) | (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid) |
| mp | 252.6 °C(lit.) |
| solubility | H2O: soluble0.1 g/mL at 25 °C, clear, colorless |
| density | 2.338 g/mL at 25 °C(lit.) |
| λ | 10 % in H2O |
| UV absorption | λ: 210 nm Amax: 0.1 |
| λ: 220 nm Amax: 0.06 | |
| λ: 230 nm Amax: 0.04 | |
| λ: 300 nm Amax: 0.02 | |
| λ: 500 nm Amax: 0.02 | |
| suitability | corresponds for filter test |
| corresponds to standard for RP gradient test |
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