Thallium(I) oxide

  • Thallous oxide
Formula
Tl2O
Structure
Description
Black crystalline powder, hygroscopic, odorless.
Uses
Substance is used in production of glass and artificial gems.

Registry Numbers and Inventories.
CAS
1314-12-1
EC (EINECS/ELINCS)
215-220-4
RTECS
XG5970000
Merck
12,9401
Canada DSL/NDSL
NDSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
OTl2
Formula mass
424.77
Melting point, °C
579
Boiling point, °C
1080
Density
9.5 g/cm3
Solubility in water
Insoluble

Hazards and Protection.
Storage
Keep container closed, thallium compounds are extremely poisonous, avoid all contact.
Protection
Neoprene or nitrile protective gloves. Approved non-vented safety goggles. Protective clothing to prevent skin contact or clothing contamination.
Respirators
NIOSH approved full face respirator with high efficiency filters.
Small spills/leaks
Isolate area, wear appropriate protective equipment. Carefully scoop up material, vacuum powder using HEPA filter, avoid raising dust. Thoroughly clean spill area.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Acids, moisture.
Decomposition
Toxic thallium fumes.

Fire.
Fire fighting
Use extinguishing media suitable for surrounding materials and type of fire. Firefighters must wear full face, self-contained breathing apparatus with full protective clothing to prevent contact with skin and eyes. Fumes from fire are hazardous. Isolate runoff to prevent environmental pollution.
Fire potential
Non-flammable
Combustion products
May emit toxic metal oxide fume.
Health
3
 
Flammability
1
 
 
Reactivity
1
 

Health.
Exposure limit(s)
OSHA PEL 0.1 mg/m3
Exposure effects
The main symptoms of thallium poisoning are peripheral neuropathy and loss of hair. Acute poisoning causes paresthesios, ataxia, alopecia, fever, coryza, abdominal pain, nausea, and vomiting. Symptoms may progress to lethargy, speech disorders, tremors, convulsions, cyanosis, pulmonary edema, bronchopneumonia and death. Kidney, liver and brain damage can occur. Thallium poisoning during the first trimester of pregnancy can cause skeletal deformities, alopecia, low birth weight and premature birth. Chronic thallium poisoning may produce alopecia, salivation and a blue line on the gums. Damage to the gastrointestinal, endocrine system and kidneys may also occur.
   Ingestion
Ingestion of thallium compounds can cause fatigue, limb and joint pain, discoloration of and loss of hair, peripheral neuritis, diarrhea, vomiting, severe pain in the calves of legs, albuminuria, eosinophilia, lymphocytosis and optic neuritis followed by atrophy.
   Inhalation
Inhalation of thallium will cause irritation of mucous membranes and the respiratory tract. Can cause pulmonary edema.
   Skin
Strong skin irritant. Skin contact may cause dermatitis on first contact. Thallium compounds can be absorbed through the skin.
   Eyes
trong eye irritant.

First aid
 
   Ingestion
Do not induce vomiting. Seek immediate, competent medical attention.
   Inhalation
Remove victim to fresh air, keep warm and quiet, administer oxygen if required, get immediate medical attention.
   Skin
Brush off material, wash affected area thoroughly with soap and water, and wash contaminated clothing before reuse.
   Eyes
Flush with copious amounts of water, including under eyelids, for at least 15 minutes. Seek medical attention.

Transport.