황산 탈륨, 고체 C화학적 특성, 용도, 생산
화학적 성질
white fine crystalline powder or needles
용도
Thallium(I) sulfate is used as a precursor to thallium(I) sulfide, which exhibits high electrical conductivity when exposed to infrared light. It is further used in photocells. It is also mixed with selenium and arsenic to produce low melting glasses.
생산 방법
Commercial sources are flue dusts, either from pyrite (FeS2)
burners or from lead and zinc smelters and refiners, as a byproduct
of cadmium production at the rate of a few thousand
pounds per year. In the flue dusts thallium occurs largely as a
sulfate, which is extracted with hot water or dilute sulfuric
acid. The purification of thallium is accomplished by taking
advantage of the difference in solubility of certain thallium
compounds and the impurities. Traces of zinc, copper,
cadmium, lead, and indium are removed by dissolving
the thallium in and precipitating the impurities with hydrogen
sulfide.
일반 설명
Odorless white rhomboid prisms or a dense white powder. Density 6.77 g / cm3. Melting point 1170°F (632°C). Extremely toxic by ingestion. Very toxic by skin absorption and ingestion. A slow acting cumulative poison. Used as a rat poison, and an ant bait. Also used for analysis (testing for iodine in the presence of chlorine) and ozonometry. Not registered as a pesticide in the U.S.
공기와 물의 반응
Soluble in water.
반응 프로필
THALLIUM(I) SULFATE has weak oxidizing and weak reducing powers. Redox reactions can however still occur.
건강위험
Rated as extremely toxic. The probable oral lethal dose in humans is 5 to 50 mg/kg, or between 7 drops and 1 teaspoon for a 150-pound person. The mean lethal dose in an adult is probably about 1 gm of THALLIUM(I) SULFATE. Chronic exposure causes hair loss starting 10 days after exposure and complete baldness in about a month.
화재위험
When heated to decomposition, THALLIUM(I) SULFATE emits very toxic fumes of thallium and sulfur oxide.
Safety Profile
Human poison by ingestion. Experimental poison by ingestion and subcutaneous routes. Human systemic effects by ingestion: ataxia, change in heart rate, excitement, eye changes, irritability, nausea or vomiting, nerve or sheath structural changes, somnolence, wakefulness. Experimental reproductive effects. When heated to decomposition it emits very toxic fumes of T1 and SOx. Used as a rat poison, ant bait, and a reagent in analytical chemistry. See also THALLIUM COMPOUNDS and SULFATES.
Carcinogenicity
Thallium is not classifiable with
respect to carcinogenicity due to a lack of relevant human and
animal studies. Several subchronic and chronic animal studies
on thallium and compounds are available; however, they
were not designed to examine carcinogenic end points.
Purification Methods
The sulfate crystallises from hot water (7mL/g) by cooling; then dry it under vacuum over P2O5. It is POISONOUS.
황산 탈륨, 고체 준비 용품 및 원자재
원자재
준비 용품
