Chromotropic Acid Disodium Salt
CAS: 5808-22-0
Category: Dyes and pigments
| Purity | Analytical Grade ≥98%; Reagent Grade ≥99%; High Purity Grade ≥99.5% |
| Molecular Formula | C10H8Na2O8S2 |
| Molecular Weight | 400.27 |
| Appearance | White to pale yellow crystalline powder or crystalline solid, odorless |
| Packaging | 25 kg fiber drum with polyethylene inner bag, 500 g/1 kg aluminum foil bag, or customized packaging |
| Testing Indicators | Appearance — Visual inspection; Identification — UV-Vis spectroscopy and FTIR analysis; Purity — HPLC or ion chromatography; Assay — Acid-base titration or chromatographic determination; Water content — Karl Fischer titration (ASTM E203); Sodium content — Atomic absorption spectroscopy (AAS); Sulfur content — ICP-OES analysis; Heavy metals — ICP-MS or colorimetric method; Residue on ignition — Gravimetric analysis. |
| Storage Notes | Store in a cool, dry, and well-ventilated place. Keep container tightly closed and protected from moisture, heat, and direct sunlight. Avoid contact with strong oxidizing agents, strong acids, and strong bases. Store away from incompatible chemicals. |
| Lead Time | 10 days |
Chromotropic Acid Disodium Salt is a sulfonated aromatic compound widely used as an analytical reagent. It is mainly applied for spectrophotometric determination of formaldehyde, nitrogen oxides, nitrates, and other trace substances. It is also used as a dye intermediate and laboratory reagent in chemical analysis.