|
selenium dioxide basic information |
|
|
|
selenium dioxide chemical properties |
|
mp |
315 °c (subl.)(lit.) |
|
bp |
684.9 °c(lit.) |
|
density |
4.81 g/ml at 25 °c(lit.) |
|
vapor pressure |
1 mm hg ( 157 °c) |
|
fp |
315°c |
|
solubility |
h2o: soluble |
|
form |
powder |
|
color |
white |
|
water solubility |
38.4 g/100 ml (14 ºc) |
|
sublimation |
315 ºc |
|
merck |
14,8434 |
|
stability: |
stable. incompatible with organic materials, strong acids, ammonia, nitric acid, halogen acids. protect from moisture. |
|
cas database reference |
7446-08-4(cas database reference) |
|
nist chemistry reference |
selenium dioxide(7446-08-4) |
|
epa substance registry system |
selenium oxide (seo2)(7446-08-4) |
|
|
|
selenium dioxide usage and synthesis |
|
chemical properties |
yellowish white to reddish powder or crystals |
|
general description |
a white or creamy-white volatile lustrous crystal or crystalline powder with a pungent sour smell. melting point 340 deg c. density 3.954 g / cm3 . toxic by ingestion and inhalation. |
|
air & water reactions |
in presence of water will corrode most metals [uscg, 1999]. readily soluble in water forming selenious (selenous) acid. |
|
reactivity profile |
inorganic oxidizing agents, such as selenium dioxide , react with reducing agents to generate heat and products that may be flammable, combustible, or otherwise reactive. selenium dioxide reacts with water, particularly hot water, to give selenious (selenous) acid, a weak acid that is corrosive. stable to light and heat. rapidly absorbs dry hydrogen fluoride, hydrogen chloride, hydrogen bromide to form the corresponding selenium oxohalide. a good oxidizing agent. reacts oxidatively with ammonia to form dinitrogen gas and selenium [merck]. oxidizes many organic substances. |
|
health hazard |
absorption of selenium may be demonstrated by presence of the element in the urine and by a garlic-like odor of the breath. inhalation of dust can cause bronchial spasms, symptoms of asphyxiation, and pneumonitis. acute symptoms of ingestion include sternal pain, cough, nausea, pallor, coated tongue, gastrointestinal disorders, nervousness, and conjunctivitis. contact with eyes causes irritation. |
|
fire hazard |
special hazards of combustion products: sublimes and forms toxic vapors when heated in fire. |
|
|
|
selenium dioxide preparation products and raw materials |
hennan sunlake enterprise corporation is located in henan province , the central plain of china , which enjoys favorable geogeaphical position and convenient transportion, the com[any was established in june. 1998 , until now having more than 18 years experience in manufacturing & exporting chemical raw material .
sunlake is a professional manufacturer engaged in producing and selling chemicals,including organic & inorganic chemicals , pigments & dyestuffs , water treatment chemicals , food & feed additives and others . these products have been being well exported to europe , southeast asia , the middle east , africa , south america and some other countries and areas.
we sincerely welcome foreign friends to visit our plant for cooperation. with the idea of "quality first,credit priority, excellent service", we are highly acknowledged by customers for good quality and competitive price. more importantly , the company has a strong r & d team, who are professional engineers and scholars with ph. d. .so we are confident to serve you better with our high - quality products and professional team.
we are taking great efforts to provide our customers with demanded goods and professional services, and continuously improve our core ability of competition and get the momentum for sustainable development, and finally make us being a reliable and professional wupplier in international market.
we welcome any serious inquiries from all customers of the world, and sincerely hope to cooperate with you for a brilliant future!
China (Mainland) 
free samples 54735-61-4 NO.1 factory