Table E.6.
Specifications established for dipotassium phosphate (E 340(ii)) according to Commission Regulation (EU) No 231/2012 and JECFA (2006a)
| Commission Regulation No 231/2012 | JECFA (2006b,c,d,e,f) | |
|---|---|---|
| Assay |
Content not less than 98% after drying at 105°C for 4 h P2O5 content between 40.3% and 41.5% on the anhydrous basis |
Not less than 98.0% after drying |
| Description | Colourless or white granular powder, crystals or masses; deliquescent substance, hygroscopic | Colourless or white granular powder, crystals or masses; deliquescent |
| Identification | ||
| Test for potassium | Passes test | Passes test |
| Test for phosphate | Passes test | Passes test |
| Solubility | Freely soluble in water. Insoluble in ethanol | Freely soluble in water, insoluble in ethanol |
| pH | Between 8.7 and 9.4 (1% solution) | 8.7–9.3 (1 in 100 solution) |
| Test for orthophosphate | Dissolve 0.1 g of the sample in 10 mL water, acidify slightly with dilute acetic acid TS and add 1 mL of silver nitrate TS. A yellow precipitate is formed | |
| Purity | ||
| Loss on drying | Not more than 2.0% (105°C, 4 h) | Not more than 5% (105°C, 4 h) |
| Water‐insoluble matter/substances | Not more than 0.2% (on the anhydrous basis) | Not more than 0.2% |
| Fluoride | Not more than 10 mg/kg (expressed as fluorine) |
Not more than 10 mg/kg See description under TESTS |
| 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 | – |