Thallium selenite

  • Thallium(i) selenite
Formula
Tl2SeO3
Structure
Description
Dark gray plates with a metallic luster.
Uses
Molten thallium selenide is a semiconductor.

Registry Numbers and Inventories.
CAS
12039-52-0
EC (EINECS/ELINCS)
234-895-6
RTECS
XG6300000
RTECS class
Other
UN (DOT)
1707
Beilstein/Gmelin
320015 (G)
RCRA
P114
Canada DSL/NDSL
NDSL
US TSCA
Listed
Korea ECL
Listed

Properties.
Formula
O3SeTl2
Formula mass
283.34
Melting point, °C
340
Solubility in water
Moderately soluble.

Hazards and Protection.
Storage
Avoid heat and sparks.
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
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
No data.
Incompatibilities
Thallium selenide reacts with halogens to give haloselenides.
Decomposition
When heated to decomposition, emits toxic fumes of thallium and selenium.

Fire.
Fire fighting
Use method most appropriate to fight surrounding fire.
Fire potential
Non-Combustible
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH REL: TWA 0.1 mg/m3 [skin] OSHA PEL: TWA 0.1 mg/m3 [skin] IDLH 15 mg/m3 (as Tl)
Exposure effects
Early effects may include paresthesias, myalgias, peripheral burning sensation, headache, cranial nerve palsies, seizures, delirium, coma, peripheral neuropathy, severe pain, and muscle weakness/atrophy. Protracted cases may develop ataxia, choreiform movements, dementia, depression and psychosis. Neurological damage resolves slowly and may be permanent.
   Ingestion
Gi symptoms may include anorexia, salivation, diarrhea, constipation, stomatitis, severe paroxysmal abdominal pain, vomiting, and hemorrhage.
   Inhalation
Respiratory failure or ards may develop in severe cases.
   Skin
Severe acne, hair pigmentation, mees lines, and alopecia may occur.
   Eyes
Optic neuritis, decreased visual acuity and impaired color vision may occur.

First aid
 
   Ingestion
Administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents. Consider after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion (generally within 1 hour). Monitor cardiac, renal and hepatic function. Prussian blue: although preferred in europe, prussian blue is not commercially available in the us and is not fda-approved. Contraindications: diethylthiocarbamate has been reported to result in dangerous redistribution of thallium to the cns and is contraindicated. Potassium chloride - has been reported to enhance elimination with equivocal results; can acutely worsen neurological symptoms.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   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.
UN number
1707
Response guide
Hazard class
6.1
Packing Group
II