Potassium thiosulfate

  • Potassium hyposulfite
  • Thiosulfuric acid, dipotassium salt
Formula
K2S2O3
Structure
Description
Alightly yellow lumps with the smell of sulfide.

Registry Numbers and Inventories.
CAS
10294-66-3
EC (EINECS/ELINCS)
233-666-8
Merck
12,7867
Beilstein/Gmelin
47405 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
K2O3S2
Formula mass
190.33
Decomposition point, °C
430
Solubility in water
600 g/L (10 C)

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Store in a cool, dry place.
D2B
Protection
Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Wear appropriate protective gloves and clothings.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, observing precautions in the Protective Equipment section. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Oxidizing materials, metals, strong reducing agents, alcohols aluminum, halogenated agents, halogens, zinc.
Decomposition
Oxides of sulfur, hydrogen sulfide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Extinguishing Media Use water spray to cool fire-exposed containers. Use extinguishing media most appropriate for the surrounding fire.

Health.
Exposure effects
   Ingestion
May cause severe gastrointestinal tract irritation with nausea vomiting and possible burns. May cause central nervous system depression, characterized by excitement, followed by headache dizziness, drowsiness, and nausea. Advanced stages may cause collapse, unconsciousness, coma and possible death due to respiratory failure May form hydrogen sulfide in the stomach, which if absorbed, may be harmful and paralyze the respiratory center.
   Inhalation
May cause severe irritation of the upper respiratory tract with pain, burns, and inflammation. May cause effects similar to those described for ingestion.
   Skin
Contact with skin causes irritation and possible burns, especially if the skin is wet or moist.
   Eyes
May cause severe eye irritation. May cause irreversible eye injury.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.