| Specifications | |
|---|---|
| Assay (iodometric) | 98.0 - 100.5 % |
| Identity | passes test |
| Appearance of solution | passes test |
| pH-value (5 %; water) | 3.5 - 5.0 |
| Insoluble matter | ≤ 0.005 % |
| Chloride (Cl) | ≤ 0.005 % |
| Thiosulfate (S₂O₃) | ≤ 0.05 % |
| Thiosulphate (S₂O₃) | passes test |
| Heavy metals (as Pb) | ≤ 0.001 % |
| As (Arsenic) | ≤ 0.0001 % |
| Fe (Iron) | ≤ 0.0005 % |
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Key Spec Table
| CAS # | EC Number | Hill Formula | Molar Mass | Grade Value |
|---|---|---|---|---|
| 7681-57-4 | 231-673-0 | Na₂O₅S₂ | 190.11 g/mol | ACS,Reag. Ph Eur |
| Description | |
|---|---|
| Catalogue Number | 106528 |
| Synonyms | Sodium metabisulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite |
| Product Information | |
|---|---|
| CAS number | 7681-57-4 |
| EC index number | 016-063-00-2 |
| EC number | 231-673-0 |
| Grade | ACS,Reag. Ph Eur |
| Hill Formula | Na₂O₅S₂ |
| Molar Mass | 190.11 g/mol |
| HS Code | 2832 10 00 |
| Applications | |
|---|---|
| Application | Sodium disulfite (sodium metabisulfite) for analysis EMSURE® ACS,Reag. Ph Eur. CAS 7681-57-4, pH 3.5 - 5 (50 g/l, H₂O, 20 °C). MSDS and product info below. |
| Physicochemical Information | |
|---|---|
| Density | 2.36 g/cm3 (20 °C) |
| Melting Point | 150 °C (decomposition) |
| pH value | 3.5 - 5 (50 g/l, H₂O, 20 °C) |
| Bulk density | 1000 - 1200 kg/m3 |
| Solubility | 650 g/l |
| Toxicological Information | |
|---|---|
| LD 50 oral | LD50 Rat 1540 mg/kg |
| LD 50 dermal | LD50 Rat > 2000 mg/kg |
| Safety Information according to GHS | |
|---|---|
| Hazard Pictogram(s) |   |
| Hazard Statement(s) | H302: Harmful if swallowed. H318: Causes serious eye damage. EUH031: Contact with acids liberates toxic gas. |
| Precautionary Statement(s) | P280: Wear eye protection. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P313: Get medical advice/ attention. |
| RTECS | UX8225000 |
| Storage class | 10 - 13 Other liquids and solids |
| WGK | WGK 1 slightly water endangering |
| Disposal | 6 Sulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E. |
| Safety Information | |
|---|---|
| Hazard Symbols |  Harmful |
| Categories of danger | harmful, irritant |
| R Phrase | R 22-31-41 Harmful if swallowed.Contact with acids liberates toxic gas.Risk of serious damage to eyes. |
| S Phrase | S 26-39-46 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear eye/face protection.If swallowed, seek medical advice immediately and show this container or label. |
| Storage and Shipping Information | |
|---|---|
| Storage | Store at +5°C to +30°C. |
| Transport Information | |
|---|---|
| Declaration (railroad and road) ADR, RID | Kein Gefahrgut |
| Declaration (transport by air) IATA-DGR | No Dangerous Good |
| Declaration (transport by sea) IMDG-Code | No Dangerous Good |
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