Ammonium bisulfite

  • Sulfurous acid, monoammonium salt
  • Acid ammonium sulfite
  • Ammonium hydrogensulfite
Formula
NH4HSO3
Structure
Description
Colorless crystals.
Uses
Source of sulfur in fluid fertilizers.

Registry Numbers and Inventories.
CAS
10192-30-0
EC (EINECS/ELINCS)
233-469-7
RTECS
WT3595000
UN (DOT)
2693
Merck
12,528
Beilstein/Gmelin
114931 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H5NO3S
Formula mass
99.11
Melting point, °C
147
Decomposition point, °C
147
Density
2.03 g/cm3 (20 C)
Solubility in water
2670 g/L

Hazards and Protection.
Storage
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear face shield or safety glasses and rubber gloves.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Add calcium hypochlorite (Ca(ClO)2). Neutralize with dilute acid. Adjust pH to neutral (pH=7).
Stability
No data.
Incompatibilities
Can react explosively with strong oxidizing agents.
Decomposition
When heated to decomposition it emits toxic vapors of ammonia. When heated to decomposition it emits very toxic fumes of so(x) sulfur oxides, NOX nitrogen oxides and nh(3).

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.)
Fire potential
Nonflammable.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
None

Health.
Exposure effects
Increases in blood pressure and pulse have been reported. An altered mental status (coma) may be seen, but is not characteristic unless hypoxemia occurs. Seizures may occur with extensive absorption. No data were available to assess the teratogenic potential of this agent. <br>Decreased egg production has occurred in experimental animals. Ammonia crosses the ovine placental barrier. <br>No data were available to assess the potential effects of exposure to this agent during lactation. <br>No information about possible male reproductive effects was found in available references.
   Ingestion
Nausea and vomiting occur frequently following ingestion. Swelling of the lips, mouth, and larynx, and oral or esophageal burns may occur if concentrated ammonia solutions are ingested.
   Inhalation
TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.
   Skin
Concentrated ammonia may produce liquifaction necrosis and deep penetrating burns.
   Eyes
Swelling of the tongue, angioedema, difficulty in swallowing, or upper airway obstruction may occur in sensitive individuals. Ocular injury may occur from exposure to high concentrations.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Flush exposed area with water.
   Eyes
Flush with water.

Transport.
UN number
2693
Response guide
Hazard class
8
Packing Group
III
 
USCG CHRIS Code
ASU
 
43 Misc. water solutions
Std. Transport #
4932348
 
IMO Pollution Category
D
IMO Hazard code
S