CASR |
: | 7681-57-4 |
Molecular Formula |
: | Na2S2O5 |
Molecular Weight |
: | 190.1 |
| Specifications | |
|---|---|
| Appearance: | White or almost white to yellowish crystalline powder or colorless crystals. |
| Solubility: | Freely soluble in water and in glycerin. Slightly soluble in ethanol (96%) and alcohol. |
| Identification A (By pH): | 3.5 to 5.0 |
| Identification (Reaction of sulfates): | White precipitate should form. |
| Identification (Reaction of sodium): | A dense white precipitate should form. |
| Identification (Sulfite): | A filter paper moistened with mercurous nitrate solution should blacken. |
| Appearance of solution: | Clear and colorless solution. |
| pH: | 3.5 to 5.0 |
| Thiosulfates: | The solution should remain clear for at least 15 min. |
| Limit of Thiosulfate: | NMT 0.05% |
| Iron (Fe): | NMT 20ppm |
| Limit of Chloride: | NMT 0.05% |
| Assay(as SO2): | 65.0%- 67.4% |
| Assay: | 95.0% - 100.5% |
| Total aerobic microbial count: | NMT 100 CFU/gm |
| Total Yeast and mold count: | NMT 10 CFU/gm |
| E.coli: | should be absent/gm |
| Salmonella: | should be absent/10gm |
| Pseud. aeruginosa: | should be absent/gm |
| Staphylococcus aureus: | should be absent/gm |
| Bile-tolerant gram negative bacteria: | should be absent/gm |
| Bacterial endotoxin test: | NMT 6.0 EU/gm |
