Sodium sulfite (anhydrous)
CAS 7757-83-7 · EC 231-821-4 · Na2O3S
Also known as sodium sulphite, disodium sulfite
ECHA CHEM holds two records with this CAS/EC (100.028.929 and 100.216.736); both have "Not classified" as the most-notified classification (31.99% and 96.77% respectively). Record 100.028.929 used here.
Handle chemistry safely
Wear gloves and eye protection, work with good ventilation, and read the supplier’s safety data sheet before use. Hazard information here is a summary, not a replacement for it. Dispose of all photographic chemistry correctly, in line with local laws and your local authority’s guidance. Never mix waste solutions, and check the supplier’s safety data sheet before disposing of anything.
Hazards
There is no official EU classification. Shown is the classification most companies have notified to ECHA: 31.99% of notifications, 12 distinct classifications notified.
No hazard statements in this classification.
Photographic uses
- preservative in developers
- fixer component (F-5, F-24)
- Parodinal
Used in: Kodak D-76, Kodak D-23, Kodak D-19, Kodak D-72 (Dektol-type), Kodak D-96, Kodak F-5 acid hardening fixer, Kodak F-24 non-hardening fixer