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is a chemical element with the symbol Tl and atomic number 81.
occurs in crook site, lorandite, and hutchinsonite.
- In its
pure form, thallium is odorless and tasteless.
is also present in pyrites and is recovered from the roasting of this
ore in connection with the production of sulfuric acid.
is obtained as a by-product of the recovery of lead and zinc.
is recovered as a byproduct from the flue dust and residues generated
during the roasting and smelting steps in the processing of copper,
lead, zinc, and other sulfide ores.
is highly toxic and is used in rat poisons and insecticides, and its use
has been cut back or eliminated in many countries.
is used in the electrodes in dissolved oxygen analyzers.
has been used in treating ringworm and other skin infections; however,
its use has been limited because of the narrow margin between toxicity
and therapeutic benefits.
has been used, with sulfur or selenium and arsenic, to produce low
melting glasses which becomes fluid between 125 and 150 C.
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