الوصف

Selenium Dioxide

CAS No.:********4

Other Names:Selenium(IV)oxide

MF:SeO2

EINECS No.:********7

Grade Standard:Industrial Grade  

Purity (%):*9%

Appearance:White  Powder

Specification:
1.Density:3.*5 g/cm3
2.Molecular weight:**0.*6
3.Melting point:**0deg.c
4.Boiling point:**5deg.c
5.Vapor pressure:1.*5 KPa (*0deg.c)
6.Acidity (pKa):2.*2; 8.*2
7.Hydrochloric acid insoluble:0.***2%
8.Fe:0.**1%
9.Loss on drying:0.4%
*0.Selenate and sulphate:0.*4%
*1.Heavy Metal:0.*1%
*2.Water dissolution test eligible:Eligible

Character: White, luster, square crystal, density 3.*9~3.*5g/ml, badly volatilizable, 
its congealed form from vaporizing form appears white or pale yellow needle shape. 
It can vaporize without thaw. Sublimation temperature **5deg.c, Melting point **0~**0deg.c. 
It badly dissolves in water and turn to selenite acid. Selenium dioxide gas appears yellow-green and  smells  garlic.  Selenium dioxide is a kind of strong oxidizing agent and can was reduced by 
SO2, H2, NH3, CO, C to element selenium. 
The product absorbs water easily so it should avoid wet in store and transfer.
Application:
Used for manganese electrolysis additive, microelement additive for beverage, 
blackening agent for steal material. It can also used for oxidizing agent, catalyst, 
chemical agents, etc.

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