Potassium sulfite

  • Sulfurous acid, dipotassium salt
Formula
K2SO3
Structure
Description
White powder.
Uses
Photography, preservative and antioxidant in foods.

Registry Numbers and Inventories.
CAS
10117-38-1
EC (EINECS/ELINCS)
233-321-1
RTECS
WT3530000
Merck
12,7847
Beilstein/Gmelin
32691 (G)
Swiss Giftliste 1
G-7830
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
K2O3S
Formula mass
158.25

Hazards and Protection.
Storage
Store in a cool, dry location in a tightly closed container.
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Protection
Chemical splash goggles in compliance with OSHA regulations are advised; however, OSHA regulations also permit other type safety glasses. Wear resistant gloves such as: nitrile rubber, To prevent repeated or prolonged skin contact, wear impervious clothing and boots.
Respirators
If overexposure has been determined or documented, a NIOSH/MSHA jointly approved air supplied respirator is advised in absence of proper environmental control. OSHA regulations also permit other NIOSH/MSHA respirators under specified conditions.
Small spills/leaks
Small Spill: Sweep up material for disposal or recovery. Large Spill: Use protective clothing and devices as required. Stop spill at source. Scoop or vacuum transfer spilled product to clean containers for recovery. Sweep up unrecoverable product. Transfer sweepings, contaminated soil, and other materials to containers for disposal.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong mineral acids, strong organic acids, strong oxidizing agents.
Decomposition
Sulfur dioxide.

Fire.
Fire fighting
Use an extinguishing media appropriate for surrounding fire. Water may be used to keep fire-exposed containers cool until fire is out. Wear a self-contained breathing apparatus with a full facepiece operated in the positive pressure demand mode with appropriate turn-out gear and chemical resistant personal protective equipment.
Hazards
No special fire hazards are known to be associated with this product.
Combustion products
Sulfur dioxide.

Health.
Poison_Class
3
Exposure effects
Signs and symptoms of exposure to this material through breathing, swallowing, and/or passage of the material through the skin may include: stomach or intestinal upset (nausea, vomiting, diarrhea, irritation (nose, throat, airways).
   Ingestion
Nausea and vomiting may be noted. Weight loss can be seen with chronic exposure.
   Inhalation
Respiratory depression, cyanosis, pulmonary edema, bronchitis, and dyspnea may be noted following exposure to non-fatal concentrations.
   Skin
May cause mild skin irritation. Symptoms may include redness and burning of skin
   Eyes
May cause mild eye irritation. Symptoms include stinging, tearing, and redness

First aid
 
   Ingestion
Hydrogen sulfide is a gas at room temperature (harbison, 1998), making ingestion unlikely.
   Inhalation
Immediately move patient to fresh air and administer 100 percent oxygen. Prevent self-exposure and possible death by wearing a self-contained breathing apparatus to rescue the victim.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.