Кадмия сульфат химические свойства, назначение, производство
Химические свойства
Cadmium sulfate is a white to colorless, odorless, crystalline substance.
Физические свойства
Colorless orthogonal crystal; the hydrates have monoclinic crystal system; density 4.69 g/cm3 (density of mono-, and octahydrates is 3.79 and 3.08 g/cm3, respectively); melts at 1,000°C (octahydrate decomposes at 40°C); soluble in water, insoluble in ethanol.
Использование
Cadmium sulfate (CdS), also called “orange cadmium,” is used to produce phosphors and
fluorescent screens. It is also used as a pigment in inks and paints, to color ceramics glazes, in the
manufacture of transistors in electronics, photovoltaic cells, and solar cells, and in fireworks.
Подготовка
Cadmium sulfate is prepared by the reaction of cadmium metal or its oxide or hydroxide with dilute sulfuric acid:
CdO + H2SO4 → CdSO4+ H2
CdO + H2SO4 → CdSO4 + H2O
Cd(OH)2 + H2SO4 → CdSO4+ 2H2O.
Общее описание
Odorless white solid. Sinks and mixes slowly with water.
Реакции воздуха и воды
Water soluble.
Профиль реактивности
Cadmium sulfate acts as a weakly acidic inorganic salt, which is soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions.
Опасность
A confirmed carcinogen.
Угроза здоровью
Inhalation may cause dryness of throat, coughing, constriction in chest, and headache. Ingestion may cause salivation, vomiting, abdominal pains, or diarrhea. Contact with eyes causes irritation.
Пожароопасность
Special Hazards of Combustion Products: Toxic cadmium oxide fume may form in fires.
Профиль безопасности
Confirmed human
carcinogen with experimental carcinogenic
data. Poison by ingestion, subcutaneous, and
intraperitoneal routes. Experimental
teratogenic and reproductive effects.
Mutation data reported. See also
CADMIUM COMPOUNDS and
SULFATES. When heated to
decomposition it emits very toxic fumes of
Cd and SOx.
Возможный контакт
It is used in pigments, electroplating;
as a fungicide; and in synthetic and analytical chemistry.
Also used in fluorescent screens; as an electrolyte.
Incompatibilities: Acts as a weak inorganic acid; neutralizes bases. Incompatible with oxidizers (chlorates, nitrates,
peroxides, permanganates, perchlorates, chlorine, bromine,
fluorine, etc.); contact may cause fires or explosions. Keep
away from alkaline materials, strong bases, strong acids,
oxoacids, epoxides, sulfur, selenium, tellurium, zinc
Перевозки
UN2570 Cadmium compounds, Hazard Class:
6.1; Labels: 6.1-Poisonous materials, Technical Name
Required.
Меры предосторожности
Cadmium compounds cause more health disorders to occupational workers and persons
with pre-existing skin disorders, eye problems, blood disorders, prostate problems, or
impaired liver, kidney, or respiratory function. These workers are more susceptible to the
effects of cadmium salts. On contact with cadmium, exposed workers should wash the
skin and eyes immediately with plenty of water
Кадмия сульфат препаратная продукция и сырье
сырьё
препарат