Alizarin Red S Mono Sodium Salt GR 25Grm
for analysis and indicator
Manufacturer: Merck
Catalog ID: 106278.0025
Stock: In Stock
Description
| Catalogue Number | 106278 |
Product Information
| CAS number | 130-22-3 |
| EC number | 204-981-8 |
| Hill Formula | C₁₄H₇NaO₇S |
| Molar Mass | 342.26 g/mol |
| HS Code | 3204 12 00 |
Storage and Shipping Information
| Storage | Store at +5°C to +30°C. |
Specifications
| Identity (UV/VIS-Spectrum) | passes test |
| 1st transition range | pH 4.3 - pH 6.3 Lightly yellow - pink |
| 2nd transition range | pH 9.4 - pH 12.0 Brown orange - violet |
| Absorption maximum λ 1 (buffer pH 4.3) | 418 - 424 nm |
| Absorption maximum λ 2 (buffer pH 6.3) | 510 - 517 nm |
| Absorption maximum λ 3 (buffer pH 9.4) | 444 - 450 nm |
| Absorption maximum λ 4 (buffer pH 12.0) | 554 - 558 nm |
| Spec. Absorptivity A 1%/1cm (λ1max; 0.01 g/l; buffer pH 4.3; calc. on dried substance) | 135 - 180 |
| Spec. Absorptivity A 1%/1cm (λ2max; 0.01 g/l; buffer pH 6.3; calc. on dried substance) | 145 - 210 |
| Spec. Absorptivity A 1%/1cm (λ3max; 0.01 g/l; buffer pH 9.4; calc. on dried substance) | 170 - 230 |
| Spec. Absorptivity A 1%/1cm (λ4max; 0.01 g/l; buffer pH 12.0; calc. on dried substance) | 340 - 520 |
| Loss on drying (110 °C) | ≤ 10 % |
