Selenium dioxide | Yunnan Titan New Materials Technology Co.,Ltd

Mô tả

Selenium dioxide is the chemical compound with the formula SeO₂. This colorless solid is one of the most frequently encountered compounds of selenium.

Selenium dioxide



Other names[hide] Selenium(IV) oxide Selenous anhydride
Identifiers
CAS number	7446-08-4^Y
PubChem	24007
ChemSpider	22440^Y
UNII	9N3UK29E57^Y
UN number	3283
RTECS number	VS8575000
Jmol-3D images	Image 1
Properties
Molecular formula	SeO₂
Molar mass	110.96 g/mol
Appearance	White, yellowish white,^[1] or red^[1] crystalline solid
Odor	rotten radishes
Density	3.954 g/cm³, solid
Melting point	340 °C (sealed tube)
Boiling point	350 °C subl.
Solubility in water	38.4 g/100 mL (20 °C) 39.5 g/100 ml (25 °C) 82.5 g/100 mL (65 °C)
Solubility	soluble in benzene
Solubility in ethanol	6.7 g/100 mL (15 °C)
Solubility in acetone	4.4 g/100 mL (15 °C)
Solubility in acetic acid	1.11 g/100 mL (14 °C)
Solubility in methanol	10.16 g/100 mL (12 °C)
Vapor pressure	1.65 kPa (70 °C)
Acidity (pK_a)	2.62; 8.32
Refractive index (n_D)	> 1.76
Structure
Crystal structure	see text
Coordination geometry	trigonal (Se)
Hazards
MSDS	ICSC 0946
EU Index	034-002-00-8
EU classification	Toxic (T) Dangerous for the environment (N)
R-phrases	R23/25, R33, R50/53
S-phrases	(S1/2), S20/21, S28, S45, S60, S61
Flash point	Non-flammable
Related compounds
Other anions	Selenium disulfide
Other cations	Sulfur dioxide Tellurium dioxide
Related selenium oxides	Selenium trioxide
Related compounds	Selenous acid
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

ỨNG DỤNG

For manganese electrolysis additive beverage with trace elements additives, iron and steel materials blackening agent

Can be used as the oxidizer, catalyst, chemical reagent.

Phiếu kiểm nghiệm

Product name	Selenium dioxide	CAS：7446-08-4
Description	White lustrous tetragonal crystal
TEST ITEMS		TEST RESULT( % )
		Analytical grade	Chemically pure
SeO₂		≥ 99.0	98.0
Residue on ignition (as sulphate)		≤ 0.05	0.2
Cl		≤ 0.003	0.005
Sulfate and selenate		≤ 0.05	0.1
Fe		≤ 0.001	0.002
Heavy metals (as Pb)		≤ 0.001	0.05
Water Insoluble		≤ 0.005	0.01