Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Sodium Metabisulfite - ACS Grade
ACS Grade
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 7681-57-4
- Structure
Structure · PubChem - Grade
- ACS Grade
- Assay specification
- Min. 97.0%
- Answer summary
Sample specification reference for Sodium Metabisulfite - ACS Grade. Source-record results are reference values, not measurements for your lot.
Last reviewed 2026-07-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
Specifications
| Parameter | Specification | Source reference result | Test Method |
|---|---|---|---|
| Assay (Na2S2O5) | Min. 97.0% | 98.8% | — |
| Appearance | White to yellowish | Passes test | — |
| Chloride (Cl) | Max. 0.05 % | 0.0039 % | — |
| Heavy metals (as Pb) | Max. 0.001 % | 0.00008 % | — |
| Identification | Pass Test | Passes test | — |
| Insoluble matter | Max. 0.005 % | 0.00088 % | — |
| Iron (Fe) | Max. 0.002 % | 0.00020 % | — |
| pH | 4 to 6 | 5.2 | — |
| Thiosulfate (S2O3) | Max. 0.05 % | 0.0085 % | — |
| Sulfur dioxide (SO2), available | Min. 65.0% | 66.5% | Iodometric titration (I2 / Na2S2O3 back-titration) |
| Solubility (25 g/100 mL water) | Clear, colorless to faintly yellow solution | Passes test | Visual clarity and colour, 20 C |
Specification limits and source-record results are reproduced from the current product reference used by the TDS. This sample is not an issued certificate and does not identify a tested lot. Contact Alliance Chemical with the product and lot number for lot-specific documentation.
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