Table E.24.
Specifications for potassium polyphosphate (E 452(ii)) according to Commission Regulation (EU) No 231/2012 and as INS 452(ii) according to JECFA (2012a,b)
| Commission Regulation (EU) No 231/2012 | JECFA (2012a,b) | |
|---|---|---|
| Assay | P2O5 content not less than 53.5% and not more than 61.5% on the ignited basis | Not less than 53.5% and not more than 61.5% of P2O5 on the ignited basis |
| Description | Fine white powder or crystals or colourless glassy platelets | Odourless, colourless or white glassy masses, fragments, crystals or powder |
| Identification | ||
| Test for potassium | Passes test | Mix 0.5 g of the sample with 10 mL of nitric acid and 50 mL of water, boil for about 30 min and cool. The resulting solution is used for the test |
| Test for phosphate | Passes test | Mix 0.5 g of the sample with 10 mL of nitric acid and 50 mL of water, boil for about 30 min and cool. The resulting solution is used for the test |
| Solubility | 1 g dissolves in 100 mL of a 1 in 25 solution of sodium acetate | 1 g dissolves in 100 mL of a 1 in 25 solution of sodium acetate |
| pH | Not more than 7.8 (1% suspension) | – |
| Purity | ||
| Loss on ignition | Not more than 2% (105°C, 4 h then 550°C, 30 min) | Not more than 2% after drying (105°, 4 h) followed by ignition at 550°C for 30 min |
| Cyclic phosphate | Not more than 8% on P2O5 content | Not more than 8.0% |
| 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 | – |