Potassium disulfite
SIGALD/12619 - puriss., meets analytical specification of Ph.Eur., BP, NF, FCC, E224, 95.0-101.0% (iodometric), powder, 51.8-57.6% sulfur dioxide
Synonym: 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
| anion traces | chloride (Cl-): ≤100 mg/kg |
| assay | 95.0-101.0% (iodometric) |
| cation traces | As: ≤2 mg/kg |
| Cu: ≤20 mg/kg | |
| Fe: ≤10 mg/kg | |
| Hg: ≤1 mg/kg | |
| Pb: ≤2 mg/kg | |
| Se: ≤5 mg/kg | |
| Zn: ≤20 mg/kg | |
| form | powder |
| grade | puriss. |
| impurities | organic volatile impurities, complies (GC) |
| residual solvents, in accordance | |
| ≤0.001% heavy metals (as Pb) | |
| ≤0.08% thiosulfate (S2O3) | |
| 51.8-57.6% sulfur dioxide | |
| InChI | 1S/2K.H2O5S2/c;;1-6(2)7(3 |
| InChI key | RWPGFSMJFRPDDP-UHFFFAOYSA |
| pH | 3.5-4.5 (20 °C, 5%) |
| quality | meets analytical specification of Ph.Eur., BP, NF, FCC, E224 |
| Quality Level | 100  |
| SMILES string | [K+].[K+].[O-]S(=O)S([O-] |
| suitability | in accordance for appearance of solution |
| Symbol |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H318 - H335 |
| Precautionary statements | P280 - P305 + P351 + P338 + P310 |
| 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 | 95.0-101.0% (iodometric) |
| UNSPSC | 12352300 |