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THALLIUM Structure

THALLIUM

Chemical Properties

Melting point 303 °C(lit.)
Boiling point 1457 °C(lit.)
Density  1.01 g/mL at 25 °C
solubility  insoluble in H2O; reacts with acid solutions
form  rod
color  Clear colorless
Specific Gravity 11.85
Resistivity 18 μΩ-cm, 20°C
Water Solubility  insoluble H2O; reacts with HNO3, H2SO4 [MER06]
Merck  13,9327
Exposure limits TLV-TWA 0.1 mg/m3 (thallium and its soluble salts) (ACGIH, MSHA, and OSHA); IDHL 10/mg/m3.
Stability Stable.
CAS DataBase Reference 7440-28-0(CAS DataBase Reference)
EPA Substance Registry System Thallium (7440-28-0)

Safety Information

Hazard Codes  Xn,T+,T
Risk Statements  26/28-33-53-36/37/38-20/22-36/38-23/25
Safety Statements  13-28-45-61-36/37/39-36/37-26
RIDADR  UN 3288 6.1/PG 2
WGK Germany  3
RTECS  XG3425000
23
TSCA  Yes
HazardClass  6.1
PackingGroup  II
Hazardous Substances Data 7440-28-0(Hazardous Substances Data)
Toxicity A naturally occurring metal used in organic syntheses, to form alloys with other metals, as a rodenticide and in superconductor research. Thallium was also used historically as a depilatory. Acute toxicity from thallium includes nausea, vomiting, diarrhea, polyneuritis, coma, convulsions, and death. Chronic toxicity includes reddening of the skin, polyneuritis, alopecia, and cataracts. Neural, hepatic, and renal damage, as well as deafness and loss of vision, have been documented after chronic exposure. The mechanism associated with such toxic effects is thought to involve complexing of thallium with sulfhydryl groups in mitochondria and consequent interference with oxidative phosphorylation. The oral LD50 in rats is about 30 mg/ kg, although 8-12 mg/kg is the estimated lethal dose in humans. Thallium is also teratogenic in rats.

MSDS

Usage And Synthesis