Selenium dioxide
Selenium dioxide
- CAS:
- 7446-08-4
- MF:
- O2Se
- MW:
- 110.96
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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
- crystal system
- square
- Space group
- P42/mbc
- Lattice constant
a/nm b/nm c/nm α/o β/o γ/o V/nm3 0.83622 0.83622 0.50612 90 90 90 0.3539
- 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
30 India supplier list of "Selenium dioxide "
- Product Name:Selenium dioxide, 98%
- Products Intro:Purity: 99% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Trader
- Country/Region: Gujarat,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Manufacturer
- Country/Region: Maharashtra,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Reagent
- Country/Region: Maharashtra,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg
- Company Type: Reagent
- Country/Region: Gujarat,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg And 1MT
- Company Type: Manufacturer
- Country/Region: Maharashtra,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Reagent
- Country/Region: Madhya Pradesh,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 98% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Manufacturer
- Country/Region: Maharashtra,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 99% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Manufacturer
- Country/Region: Gujarat,INDIA
- Product Name:SELENIUM DIOXIDE
- Products Intro:Purity: 99% | Package: 25kg;INR
- Company Type: Manufacturer
- Country/Region: Mumbai,INDIA
- Product Name:Selenium(IV) oxide
- Products Intro:Purity: 99% | Package: 1 kg,5 kg, 10 kg,25kg and 1 MT
- Company Type: Reagent
- Country/Region: Maharashtra,INDIA