English name: Thallium, derived from thallqs, means bud-it was discovered in 186 1 year because its bright yellow line in the spectrum has a new green color. Its main use is to make thallium sulfate, a powerful rodenticide. Thallium is a tasteless and odorless metal, which can be mixed with starch, sugar, glycerol and water to make a rodenticide for "entertaining" mice. It is quite useful in putting out plague.
Chemical properties:
Thallium, atomic number 8 1, atomic weight 204.3833, the chemical symbol comes from the bright green of its spectral line, which originally means "twig". 186 1 year, crookes, a British chemist and physicist, found this element in the spectrum of waste residue from a sulfuric acid plant and named it; The following year, crookes and Lamy made thallium by electrolysis almost simultaneously. The content of thallium in the earth's crust is about 3/100,000, and it is distributed in feldspar, mica and sulfide minerals of iron and copper with low concentration, and there are few independent thallium minerals.
Thallium is a white, heavy and soft metal with a melting point of 303.5°C, a boiling point of1457 C and a density of11.85g/cm. Thallium is a high-risk radioactive heavy metal.
Performance of thallium poisoning:
Cause of poisoning: Thallium is more toxic than lead and mercury. Thallium compounds are widely used in industrial production. In addition, the raw materials for the production of firecrackers (fireworks) often contain a high amount of thallium, and its by-product sodium chloride (non-edible salt) is also polluted. When people eat this non-edible salt (which is often sold by criminals), it causes poisoning.
Poisoning manifestations: numbness or pain in lower limbs, low back pain, hair loss, headache, mental anxiety, muscle pain, limb tremor, unstable walking, etc.
Precautionary measures: sodium chloride (non-edible salt), a by-product of firecrackers, is often red. Be careful not to buy or eat red salt.
Source of elements: It is found in a few minerals (such as selenium thallium silver copper ore and red thallium ore) in the form of compounds, which is extremely toxic.