The use of sodium sulfite：
1. For tellurium and niobium trace analysis and determination and development solution preparation, also used as reducing agent;
2. Used for artificial fiber stabilizer, fabric bleach, photographic developer, dye bleaching deoxidizer, fragrance and dye reducing agent, papermaking lignin removal agent, etc.;
3. Used as a general analysis reagent and photosensitive resistance material;
4. Reducing bleaching agent, bleaching effect on food and plant food in the oxidase has a strong inhibitory effect.
| Product name | Sequence numbers | Testing programmes | Superior | First grade |
sodium sulfite
(HG/T2967-2010)
| 1 | appearance | white crystalline powder |
| 2 | Na2SO3(%) | ≧97 | ≧93.0 |
| 3 | Fe(%) | ≦0.003 | ≦0.005 |
| 4 | water-insoluble substance(%) | ≦0.02 | ≦0.03 |
| 5 | free alkali(%) | ≦0.10 | ≦0.40 |
| 6 | sulfates(%) | ≦2.5 | __ |
| 7 | chloride(%) | ≦0.10 | __ |
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