Cobaltous bromide

  • Cobalt dibromide
  • Cobalt(II) bromide
Formula
CoBr2
Structure
Description
Cobaltous bromide is a red violet crystalline solid.
Uses
Chiefly in hygrometers, also as catalysts for organic reactions.

Registry Numbers and Inventories.
CAS
7789-43-7
EC (EINECS/ELINCS)
232-166-7
RTECS
GF9595000
RTECS class
Other
UN (DOT)
9103
Merck
12,2496
Beilstein/Gmelin
9280 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Br2Co
Formula mass
218.74
Melting point, °C
6782
Density
4.909 g/cm3 (20 C)
Solubility in water
Soluble

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 appropriate protective gloves, clothing and goggles.
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: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Hygroscopic, forms hexahydrate in air solution containing cobaltous ion.
Incompatibilities
Reacts as acid to neutralize bases.
Decomposition
When heated to decomposition can give off highly toxic fumes of bromide.

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
Containers may explode when heated.
Combustion products
When heated to decompose can give off highly toxic fumes of bromide.

Health.
Exposure limit(s)
NIOSH REL: TWA 0.05 mg/m3 (as Co) OSHA PEL: TWA 0.1 mg/m3 (as Co) 20 mg/m3 (as Co)
Carcinogin
G-A3, I-2B
Exposure effects
Fever may occur with chronic intoxication. Acute intoxication can result in CNS depression and coma. Bromides cross the placenta and may be detected in the milk of nursing mothers. Case reports suggest that prenatal exposure may cause growth retardation, craniofacial abnormalities and developmental delay.
   Ingestion
Nausea and vomiting occur following acute or chronic ingestion. Anorexia and weight loss may occur with chronic intoxication.
   Inhalation
An interstitial fibrotic pulmonary process has been described among hard metal workers and diamond polishers.
   Skin
Bromide toxicity is associated in about 25% of cases with the development of bromoderma, an erythematous, nodular or acneiform rash over the face and possibly the entire body. One case of toxic epidermal necrolysis has been reported.
   Eyes
Pupils may be normal, miotic or mydriatic. Nystagmus is common.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move to fresh air.
   Skin
Wash with water.
   Eyes
Wash with water then irrigate with 0.9% saline for at least 15 minutes.

Transport.
UN number
9103
Response guide
Hazard class
9
USCG CHRIS Code
COB
 
Std. Transport #
4962650