Potassium disulfite
SIAL/55777 - analytical standard
Synonym: E224; Potassium metabisulfite; Potassium pyrosulfite
CAS Number: 16731-55-8
Empirical Formula (Hill Notation): K2O5S2
Molecular Weight: 222.32
EC Number: 240-795-3
MDL Number: MFCD00167605
Linear Formula: K2S2O5
Product Type: Chemical
application(s) | cleaning products cosmetics food and beverages personal care |
assay | ≥98% (RT) |
format | neat |
grade | analytical standard |
InChI | 1S/2K.H2O5S2/c;;1-6(2)7(3 |
InChI key | RWPGFSMJFRPDDP-UHFFFAOYSA |
Quality Level | 100 ![]() |
shelf life | limited shelf life, expiry date on the label |
SMILES string | [K+].[K+].[O-]S(=O)S([O-] |
solubility | H2O: 200 mg/mL, clear to very slightly hazy, colorless |
technique(s) | gas chromatography (GC): suitable |
HPLC: suitable |
Application: | Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support. |
General description: | Potassium disulfite (Potassium metabisulfite, PMB) is an inorganic salt with antimicrobial properties. It is a sulfiting agent that prevents browning of foods. |
Symbol | ![]() ![]() |
Signal word | Danger |
Hazard statements | H318 - H335 |
Precautionary statements | P261 - P271 - P280 - P304 + P340 + P312 - P305 + P351 + P338 - P403 + P233 |
Hazard Codes | Xi |
Risk Statements | 31-41 |
Safety Statements | 26-39 |
RIDADR | NONH for all modes of transport |
WGK Germany | WGK 1 |
Supplemental Hazard Statements | EUH031 |
Purity | ≥98% (RT) |
UNSPSC | 85151701 |