Table E.16.
Specifications for tetrapotassium diphosphate (E 450(v)) according to Commission Regulation (EU) No 231/2012 and as INS 450(v) according to JECFA (2012a,b)
| Commission Regulation (EU) No 231/2012 | JECFA (2012a,b) | |
|---|---|---|
| Assay | Content not less than 95% (800°C for 0.5 h). P2O5 content not less than 42.0% and not more than 43.7% | Not less than 95% on the ignited basis |
| Description | Colourless crystals or white, very hygroscopic powder | Colourless or white crystals, or a white crystalline or granular powder, powder of granular solid; hygroscopic |
| Identification | ||
| Test for potassium | 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 10.0 and 10.8 (1% solution) | 10.0–10.7 (1 in 100 solution) |
| Purity | ||
| Loss on ignition | Not more than 2% (105°C, 4 h then 550°C, 30 min | Not more than 2% (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 | – |