Definition | |
Chemical name | Potassium bisulphite |
Potassium hydrogen sulphite |
Einecs | 231-870-1 |
Chemical formula | KHSO3 in aqueous solution |
Molecular weight | 120,17 |
Assay | Content not less than 280 g KHSO3 per litre (or 150 g SO2 per litre) |
Description | Clear colourless aqueous solution |
Identification | |
A.Positive tests for sulphite and for potassium | |
Purity | |
Iron | Not more than 50 mg/kg based on the SO2 content |
Selenium | Not more than 10 mg/kg based on the SO2 content |
Arsenic | Not more than 3 mg/kg |
Lead | Not more than 5 mg/kg |
Mercury | Not more than 1 mg/kg |
Heavy metals (as Pb) | Not more than 10 mg/kg |