Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Sodium Bisulfite 40% ACS Grade
ACS Grade · 40%
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 7631-90-5
- Structure
Structure · PubChem - Grade
- ACS Grade · 40%
- Assay specification
- 39.5 - 40.5 % by wt
- Answer summary
Sample specification reference for Sodium Bisulfite 40% 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 (NaHSO3) | 39.5 - 40.5 % by wt | 40.07 % | — |
| Chloride (Cl) | ≤ 0.008 % | 0.00052 % | — |
| Heavy metals (as Pb) | ≤ 0.0004 % | 0.00011 % | — |
| Insoluble matter | ≤ 0.002 % | 0.00047 % | — |
| Iron (Fe) | ≤ 0.0008 % | 0.00010 % | — |
| pH (as received) @ 25 °C | 3.8 - 5.0 | 4.4 | ASTM E70 / calibrated pH electrode |
| Specific gravity @ 20 °C | 1.325 - 1.345 | 1.336 | ASTM D1298 / hydrometer |
| Sulfur dioxide (SO2), available | 24.3 - 24.9 % by wt | 24.7 % | Iodometric titration (I2 / Na2S2O3 back-titration) |
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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