- Thallium(i) selenite
Dark gray plates with a metallic luster.
Molten thallium selenide is a semiconductor.
Registry Numbers and Inventories.
Melting point, °C
Solubility in water
Hazards and Protection.
Avoid heat and sparks.
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.
Wear appropriate protective gloves, clothing and goggles.
Wear positive pressure self-contained breathing apparatus (SCBA).
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.
Thallium selenide reacts with halogens to give haloselenides.
When heated to decomposition, emits toxic fumes of thallium and selenium.
Use method most appropriate to fight surrounding fire.
Fire may produce irritating, corrosive and/or toxic gases.
NIOSH REL: TWA 0.1 mg/m3 [skin] OSHA PEL: TWA 0.1 mg/m3 [skin] IDLH 15 mg/m3 (as Tl)
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.
Gi symptoms may include anorexia, salivation, diarrhea, constipation, stomatitis, severe paroxysmal abdominal pain, vomiting, and hemorrhage.
Respiratory failure or ards may develop in severe cases.
Severe acne, hair pigmentation, mees lines, and alopecia may occur.
Optic neuritis, decreased visual acuity and impaired color vision may occur.
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.
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.
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
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.