Table E.15.
Specifications for tetrasodium diphosphate (E 450(iii)) according to Commission Regulation (EU) No 231/2012 and as INS 450(iii) according to JECFA (2012a,b)
| Commission Regulation (EU) No 231/2012 | JECFA (2012a,b) | |
|---|---|---|
| Assay | Content not less than 95% of Na4P2O7 on the ignited basis. P2O5 content not less than 52.5% and not more than 54.0% | Not less than 95.0% on the ignited basis |
| Description | Colourless or white crystals, or a white crystalline or granular powder. The decahydrate effloresces slightly in dry air | Colourless or white crystals, or a white crystalline or granular powder; the decahydrate effloresces slightly in dry air |
| Identification | ||
| Test for sodium | Passes test | Passes test |
| Test for phosphate | Passes test | Passes test |
| Solubility | Soluble in water. Insoluble in ethanol | Soluble in water. Insoluble in ethanol |
| pH | Between 9.8 and 10.8 (1% solution) | 9.9–10.8 (1 in 100 solution) |
| Purity | ||
| Loss on ignition | Not more than 0.5% for the anhydrous salt, not less than 38% and not more than 42% for the decahydrate (105°C, 4 h then 550°C, 30 min |
Not more than 0.5% for anhydrous, 38–42% for decahydrate (105°, 4 h then 550°, 30 min) |
| Water‐insoluble matter | Not more than 0.2% | Not more than 0.2% |
| Fluoride | Not more than 10 mg/kg (expressed as fluorine) | Not more than 10 mg/kg |
| Arsenic | Not more than 1 mg/kg | Not more than 3 mg/kg |
| Cadmium | Not more than 1 mg/kg | – |
| Lead | Not more than 1 mg/kg | Not more than 4 mg/kg |
| Mercury | Not more than 1 mg/kg | – |