Ammonium sulfite monohydrate

  • Diammonium sulfite monohydrate
  • Sulfurous acid, diammonium salt, monohydrate
Formula
(NH4)2SO3 : H2O
Structure
Description
colorless crystals

Registry Numbers and Inventories.
CAS
7783-11-1
31 36/37/38
UN (DOT)
3077

Properties.
Formula
H10N2O4S
Formula mass
134.16
Melting point, °C
Decomposes
Boiling point, °C
 
Density
1.41 g/cm3 (20 C)

Hazards and Protection.
Storage
Keep container tightly closed.
Protection
Compatible chemical-resistant gloves. Chemical safety goggles. Protective clothing.
Respirators
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Where risk assessment shows air-purifying respirators area ppropriate use a dust mask type N95 (US) or type P1 (EN 143) respirator.
Small spills/leaks
Sweep up, place in a bag and hold for waste disposal. Avoid raising dust. Ventilate area and wash spill site after material pickup is complete.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Air, strong oxidizing agents, acids.
Decomposition
Ammonia, hydrogen sulfide gas.

Fire.
Fire fighting
Extinguish with water spray, carbon dioxide, dry chemical powder or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.
Hazards
Emits toxic fumes under fire conditions.
Health
2
 
Flammability
0
 
 
Reactivity
1
 

Health.
Exposure effects
Prolonged or repeated exposure may cause allergic reactions in certain sensitive individuals.
   Ingestion
Ingestion results in irritation of the gastrointestinal tract. Large doses may cause violent colic and diarrhea, circulatory disturbances, central nervous depression and even death.
   Inhalation
May be harmful if inhaled. Material is irritating to mucous membranes and upper respiratory tract.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
Causes irritation. Persons with allergies and/or asthma may exhibit hypersensitivity to sulfites.

First aid
 
   Ingestion
If swallowed, wash out mouth with water provided person is conscious. Call a physician.
   Inhalation
If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.
   Skin
In case of contact, immediately wash skin with soap and copious amounts of water. Remove contaminated clothing and shoes. Call a physician.
   Eyes
In case of contact with eyes, flush with copious amounts of water for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. Call a physician.

Transport.
UN number
3077
Response guide
Hazard class
9
Packing Group
III