| SYNONYMS |
TARTRAZINE |
| DEFINITION | Tartrazine consists essentially of trisodium 5-hydroxy-1-(4-sulfonatophenyl) (4-sulfonatophenylazo)-H-pyrazole-3-carboxylate and subsidary colour matters together with sodium chloride and/or sodium sulfate as the principal uncoloured components. Tartrazine is described as the sodium salt. The calcium and the potassium are also permitted. |
| CLASS | Monoazo |
| COLOUR INDEX NO. | 19140 |
| EEC NUMBER | E-102 |
| EINECS | 217-699-5 |
| CHEMICAL NAMES | Trisodium-5-hydroxy-1-(4-sulfonatophenyl)-4-(4-sulfonatophenylazo)-H- |
| pyrazole-3-carboxylate | |
| CHEMICAL FORMULA | C16H9N4Na3O9S2 |
| MOLECULAR WEIGHT | 534.4 |
| ASSAY | Content not less than 85% total colouring matters, calculated as the sodium salt. |
| E 1% 1cm 530 at ca 426 nm in aqueous solution. | |
| DESCRIPTION | Light orange powder |
| IDENTIFICATION | |
| a. Spectrometry | Maximum in water at ca 426 nm |
| b. Yellow solution in water | |
| PURITY | Not more than 0.2% |
| Water Insoluble matter | |
| Subsidiary colouring matters | Not more than 1.0% |
| Organic compounds other than colouring matters | [4-hydrazinobenzene sulfonic acid / 4-aminobenzene-1-sulfonic acid / 5-oxo-1-(4-sulfophenyl)-2-pyrazoline-3-carboxylic acid / 4,4'- diazoaminodi(benzene sulfonic acid) / Tetrahydroxysuccinic acid] - Total not more than 0.5% |
| Unsulfonated primary aromatic amines | Not more than 0.01% (Calculated as aniline) |
| Ether extractable matter | Not more than 0.2% under neutral conditions |
| Arsenic | Not more than 3 mg/kg. |
| Lead | Not more than 10 mg/kg. |
| Mercury | Not more than 1 mg/kg. |
| Cadmium | Not more than 1 mg/kg. |
| Heavy metals | Not more than 40 mg/kg. |
| (as Pb) |
