Selenium dioxide manufacturers and suppliers

Selenium dioxide suppliers

Properties

Melting point:: 315 °C (subl.)(lit.)

Boiling point:: 684.9 °C(lit.)

Density: 4.81 g/mL at 25 °C(lit.)

vapor pressure: 1 mm Hg ( 157 °C)

refractive index: nD20 <1.76

Flash point:: 315°C

storage temp.: Store below +30°C.

solubility: H₂O: soluble

form: powder

color: white

Specific Gravity: 3.95

PH: 2 (10g/l, H2O, 20℃)

Water Solubility: 38.4 g/100 mL (14 ºC)

Sublimation: 315 ºC

Merck: 14,8434

Exposure limits: ACGIH: TWA 0.2 mg/m3
NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3

Stability:: Stable. Incompatible with organic materials, strong acids, ammonia, nitric acid, halogen acids. Protect from moisture.

Safety Information

Symbol(GHS): GHS06,GHS08,GHS09

Signal word: Danger

Hazard statements: H301+H331-H373-H410

Precautionary statements: P273-P301+P310+P330-P304+P340+P311-P314

Hazard Codes: T,N,Xn

Risk Statements: 36/38-50/53-33-23/25-51/53-20/22

Safety Statements: 26-61-60-45-28A-20/21-28

RIDADR: UN 3440 6.1/PG 3

WGK Germany: 2

RTECS: VS8575000

F: 3

TSCA: Yes

HS Code: 2811 29 90

HazardClass: 6.1

PackingGroup: II

Toxicity: LD50 orally in Rabbit: 68.1 mg/kg

Use

Selenium dioxide is reduced to selenium metal when heated with carbon and other reducing agents. When heated with ammonia, selenium dioxide forms selenium, nitrogen and water: 3SeO2 + NH3 3Se + 2N2 + 6H2O Ammonia reacts with selenium dissolved in ethanol to form ammonium ethyl selenite, NH4(C2H5)SeO3. Reaction with nitric acid forms selenic acid: Se + 2HNO3 H2SeO4 + 2NO Selenium dioxide is reduced by hydrazine to black amorphous selenium: SeO2 + N2H4 Se + N2 + 2H2O Hydroxylamine hydrochloride reduces selenium dioxide to reddish-brown amorphous selenium: SeO2 + 4NH2OHHCl Se + 2N2 + 6H2O + 4HCl The dioxide rapidly absorbs hydrogen halides, forming selenium oxyhalides: SeO2 + HBr SeOBr2 + H2O Reaction with thionyl chloride yields selenium oxychloride: SeO2 + SOCl2 SeOCl2 + SO2

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