Ammonium alum

  • Alum ammonium
  • Aluminum ammonium alum
  • Aluminum ammonium sulfate
  • Aluminum ammonium bis(sulfate)
  • Burnt ammonium alum
  • Sulfuric acid, aluminum ammonium salt (2:1:1)
Formula
Al2(NH4)2(SO4)4
Structure
Description
White powder. Odorless.
Uses
Medication.

Registry Numbers and Inventories.
CAS
7784-25-0
EC (EINECS/ELINCS)
232-055-3
Merck
12,335
Beilstein/Gmelin
36087 (G)
EPA OPP
98501
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Al2H8N2O16S4
Formula mass
474.29
Density
2.45 g/cm3 (20 C)
Solubility in water
50 g/L (20 C)

Hazards and Protection.
Storage
Keep tightly closed in a cool dry location. Store only with compatible chemicals.
Handling
Avoid contace with skin, eyes and clothing. Laboratory use only. Use in a chemical hood with proper protection.
Protection
Chemical splash goggles in compliance with OSHA regulations are advised; however, OSHA regulations also permit other type safety glasses. Whre chemical resistant gloves. To prevent repeated or prolonged skin contact, wear impervious clothing and boots.
Respirators
Full protective clothing and NIOSH approved SCBA with full facepiece operated in the pressure demant/positive pressure mode.
Small spills/leaks
Evacuate and ventilate area. Wear appropriate protective equipment. Sweep up and place in appropriate container and hold for disposal. Was contaminated surfaces.
Stability
No data.
Incompatibilities
Strong oxidizing agents.
Decomposition
Oxides of nitrogen, sulfur dioxide, ammonia and sulfur trioxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Health.
Exposure limit(s)
OSHA: PEL (8 h TWA): 15 mg/m3.
Exposure effects
Aluminum accumulates in brain tissue and is a neurotoxic agent. Ataxia and seizures have been reported following ingestions and in patients with compromised renal function receiving bladder irrigations. Mental status changes, including obtundation, lethargy and confusion, may occur.
   Ingestion
Ingestions of small amounts of alum may cause dryness and a puckering sensation of mucous membranes in the mouth and throat. Rectal enemas containing 1% ammonium alum caused mild cramping and nausea in the majority of patients.
   Inhalation
Inhalation is irritating and may cause airway congestion. Symptoms are usually transient. Respiratory depression has been reported in patients with severe aluminum encephalopathy.
   Skin
Concentrated solutions may irritate abraded skin.
   Eyes
Irritation.

First aid
 
   Ingestion
Dilution: immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Do not induce vomiting.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   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.