Sodium metabisulfite Ph.Eur 500GM | |||
98630SG500 | 377300906EV | ||
Ph.Eur. | 3773009 | ||
7681-57-4 | 84922 | ||
Na2S2O5 | May 2022 | ||
190.1 | April 2025 | ||
Sr.No. | Test | Result | Specification |
---|---|---|---|
1 | Appearance | White crystalline powder. | White or almost white crystalline powder or colorless crystals. |
2 | Solubility | Passes | Freely soluble in water. Slightly soluble in ethanol (96%). |
3 | Identification A (By pH) | 4.61 | 3.5 to 5.0 |
4 | Identification B (Reaction of sulfates) | Complies | White precipitate should form |
5 | Identification C (Reaction of sodium) | Complies | A dense white precipitate should form |
6 | Appearance of solution | Passes | Clear and colorless solution |
7 | pH | 4.61 | 3.5 to 5.0 |
8 | Thiosulfates | Passes | The solution should remain clear for at least 15 min |
9 | Arsenic (As) | Less than 5ppm | 5ppm max |
10 | Iron (Fe) | Less than 20ppm | 20ppm max |
11 | Assay | 97.5% | 95.0% - 100.5% |
Tested By (Chemist - Quality Control) | Approved By (Head - Quality Control) |