Calconcarboxylic acid, also known as Patton and Reeders Reagent, is an azo dye used as a sensitive indicator for metal titration. It is primarily utilized for the determination of calcium in the presence of magnesium at high pH levels (pH 12–13). In its solid form, it appears as a dark powder and exhibits a distinct color change from wine-red to blue at the titration endpoint when calcium ions are sequestered by a chelating agent like EDTA.
Advantages
- High selectivity for calcium ions in complex matrices.
- Sharp and easily detectable color transition at the titration endpoint.
- Suitable for environmental monitoring, including mercury detection in water.
- Applied in biochemical research for phosphoprotein determination via fluorescent quenching.
Technical specifications
| Catalogue number |
1.04595 |
| Product name |
Calconcarboxylic acid |
| Synonyms |
Patton and Reeders Reagent, HHSNADA |
| CAS Number |
3737-95-9 |
| Molecular Formula |
C21H14N2O7S · 2H2O |
| Molar Mass |
474.44 g/mol |
| Form |
Solid |
| Melting Point |
300 °C |
| Bulk Density |
400 kg/m3 |
| Storage Temperature |
2–30 °C |
Available packaging options
| 1.04595.0005 |
5 g plastic bottle |
| 1.04595.0025 |
25 g plastic bottle |
