ANNEX I
E 520 ALUMINIUM SULPHATE
Synonyms | Alum |
Definition | |
Chemical name | Aluminium sulphate |
Einecs | 233-135-0 |
Chemical formula | Al2(SO4)3 |
Molecular weight | 342,13 |
Assay | Content not less than 99,5 % on the ignited basis |
Description | White powder, shining plates or crystalline fragments |
Identification | |
| |
| Freely soluble in water, insoluble in ethanol |
Purity | |
Loss on ignition | Not more than 5 % (500 oC, 3h) |
Alkalies and alkaline earths | Not more than 0,4 % |
Selenium | Not more than 30 mg/kg |
Fluoride | Not more than 30 mg/kg |
Arsenic | Not more than 3 mg/kg |
Lead | Not more than 10 mg/kg |
Mercury | Not more than 1 mg/kg |