Selenium dioxide
Selenium oxide
CAS: 7446-08-4
Molecular Formula: O2Se
Selenium dioxide - Names and Identifiers
Selenium dioxide - Physico-chemical Properties
| Molecular Formula | O2Se |
| Molar Mass | 110.96 |
| Density | 4.81g/mLat 25°C(lit.) |
| Melting Point | 315°C (subl.)(lit.) |
| Boling Point | 684.9°C(lit.) |
| Flash Point | 315°C |
| Water Solubility | 38.4 g/100 mL (14 ºC) |
| Solubility | H2O: soluble |
| Vapor Presure | 1 mm Hg ( 157 °C) |
| Appearance | powder |
| Specific Gravity | 3.95 |
| Color | white |
| Exposure Limit | ACGIH: TWA 0.2 mg/m3NIOSH: IDLH 1 mg/m3; TWA 0.2 mg/m3 |
| Merck | 14,8434 |
| PH | 2 (10g/l, H2O, 20℃) |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Incompatible with organic materials, strong acids, ammonia, nitric acid, halogen acids. Protect from moisture. |
| Refractive Index | nD20 <1.76 |
| Physical and Chemical Properties | Characteristics of white or light yellow monoclinic or tetragonal crystal, hygroscopic and irritating sour taste. melting point 315~317 ℃ relative density 3.950 solubility: soluble in water, ethanol, acetone, acetic acid and benzene. |
| Use | As a special reagent for plant alkaloids, it can also be used for the precipitation of zirconium, hafnium and the preparation of selenium compounds |
Selenium dioxide - Risk and Safety
| Risk Codes | R36/38 - Irritating to eyes and skin. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R33 - Danger of cumulative effects R23/25 - Toxic by inhalation and if swallowed. R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R20/22 - Harmful by inhalation and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S60 - This material and its container must be disposed of as hazardous waste. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S28A - S20/21 - S28 - After contact with skin, wash immediately with plenty of soap-suds. |
| UN IDs | UN 3440 6.1/PG 3 |
| WGK Germany | 2 |
| RTECS | VS8575000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 2811 29 90 |
| Hazard Class | 6.1 |
| Packing Group | II |
| Toxicity | LD50 orally in Rabbit: 68.1 mg/kg |
Selenium dioxide - Upstream Downstream Industry
| Raw Materials | Selenium Nitric acid Nitric acid |
| Downstream Products | Selenium Disulfide |
Selenium dioxide - Nature
Open Data Verified Data
white or light yellow monoclinic or tetragonal crystals with hygroscopicity and pungent sour taste. The relative density was 3. 950. The melting point was 315-317 °c. Sublimation at 340-350 °c. Soluble in water, ethanol, acetone, acetic acid and benzene. Easily reduced to selenium. Highly toxic!
Last Update：2024-01-02 23:10:35
Selenium dioxide - Preparation Method
Open Data Verified Data
- selenium powder oxidation method: selenium powder and oxygen are reacted in the presence of nitrogen dioxide, the product is cooled to obtain a finished product, and pure selenium dioxide is obtained by sublimation.
- nitric acid oxidation method: crude selenium powder is added to the reactor to react with nitric acid, and the product is concentrated, filtered, dried, and then thermally decomposed to obtain selenium dioxide.
Last Update：2022-01-01 11:05:59
Selenium dioxide - Use
Open Data Verified Data
It is used as an oxidizing agent of an organic compound, a catalyst, a chemical reagent, and a raw material for producing various inorganic selenium compounds. It is also used in copying machines, rectifiers, and the like.
Last Update：2022-01-01 11:05:59
Selenium dioxide - Safety
Open Data Verified Data
packaged in glass bottles, each with a net weight of 0.5kg. It is an inorganic drug. Risk code: GB6.1 class 61015. Highly toxic B10 37. Store in a ventilated, dry warehouse. Pay attention to moisture, packaging should be sealed. To prevent breakage of the packaging. Toxicity and protection: similar to the toxicity of arsenic trioxide. Acute poisoning, upper respiratory tract and eye mucosa irritation symptoms, Dry Cough, rhinitis, nasal intense burning pain and other symptoms, but also cause weakness, Head Pain, dizziness, Nausea, Vomit, the exhaled breath and skin have garlic odor, loss of consciousness, collapse. Chronic poisoning will appear enamel changes, skin jaundice, chronic arthritis, rash, nail lesions, anemia, gastrointestinal disorders, neurological disorders and even dementia. Skin or mucous membrane contact with this product, severe pain, numbness, or cause burns. Poisoning patients should be removed from the poisoning site, change clothes, quiet, warm. When the patient has loss of consciousness and collapse, the patient is in the horizontal position, the head is lowered, the injection of norepinephrine and other drugs, and the patient is sent to the hospital for first aid. The maximum allowable concentration in air is 0.1 mg/m3. Use protective equipment during operation. Attention is often checked for the concentration of selenium in the air. Regular physical examination. A diet rich in protein and amino acids is supplied.
Last Update：2022-01-01 11:06:00
Selenium dioxide - Reference Information
| sublimation point | 315°C |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | selenium dioxide is mainly defined as an oxidation reagent in organic synthesis, which participates in many oxidation reactions. In recent years, many reactions have been gradually replaced by other, more excellent reagents, probably due to the toxicity of the reagent. However, the oxidation reaction of selenium dioxide with active methyl, methylene and methylene groups still plays an important role in the conversion of organic chemical functional groups. |
| toxicity | is similar to the toxicity of arsenic trioxide. Acute poisoning, upper respiratory tract and eye mucosa irritation symptoms, Dry Cough, rhinitis, nasal intense burning pain and other symptoms, but also cause weakness, Head Pain, dizziness, Nausea, Vomit, the exhaled air and skin have garlic, loss of consciousness, collapse. Chronic poisoning will appear enamel changes, skin jaundice, chronic arthritis, rash, nail lesions, anemia, gastrointestinal disorders, neurological disorders and even dementia. Skin or mucous membrane contact with this product, severe pain, numbness, or cause burns. Poisoning patients should be removed from the poisoning site, change clothes, quiet, warm. When the patient has loss of consciousness and collapse, the patient is in the horizontal position, the head is lowered, the injection of norepinephrine and other drugs, and the patient is sent to the hospital for first aid. The maximum allowable concentration in air is 0.1mg/m3. Use protective equipment during operation. Attention is often checked for the concentration of selenium in the air. Regular physical examination. A diet rich in protein and amino acids is supplied. |
| Use | for the preparation of high purity selenium and other selenium compounds, or organic synthetic drug oxidants and catalysts used as organic compound oxidants, catalysts, chemical reagents, raw materials for the manufacture of various inorganic selenium compounds. It is also used in copying machines, rectifiers, and the like. 1, for the production of Electrolytic metal manganese 2, for the production of sodium selenite 3, selenium dioxide used as an oxidant of organic compounds, catalysts, chemical reagents, raw materials for the production of various inorganic selenium compounds. Used as a special reagent of plant alkali, can also be used for the precipitation of zirconium, hafnium and preparation of selenium compounds react with ammonia to generate nitrogen and selenium, in alcohol solution to generate ethyl ammonium selenite [NH? (C? H5)SeO?] With hydrazine to generate nitrogen and black amorphous selenium, with hydroxylamine hydrochloride to generate nitrogen and red-brown amorphous selenium, and nitric acid to generate selenous acid. 4, selenium dioxide for the preparation of high-purity selenium and other selenium compounds. It is also used in copying machines, rectifiers, and the like. manufacture of other selenium compounds, alkaloid assays, oxidants. It reacts with ammonia to generate nitrogen and selenium, and generates ethyl ammonium selenite [NH4(C2H5)SeO3] in alcohol solution, and hydrazine to generate nitrogen and black amorphous selenium, with hydroxylamine hydrochloride to generate nitrogen and red-brown amorphous selenium, and nitric acid to generate selenous acid. |
| production method | selenium powder oxidation method selenium powder is reacted with oxygen in the presence of nitrogen dioxide, and the product is cooled to obtain a finished product, pure selenium dioxide was obtained by sublimation. The Se O2 → SeO2 nitric acid oxidation method adds crude selenium powder to the reactor to react with nitric acid, and the product is concentrated, filtered, dried, and then thermally decomposed to prepare selenium dioxide. Its Se 4HNO3 → H2SeO3 4NO2 H2OH2SeO3 → SeO2 H2O |
| category | toxic substances |
| toxicity grade | highly toxic |
| Acute toxicity | oral-rat LD50: 68.1 mg/kg; Oral-mouse LC50: 23.3 mg/kg |
| flammability hazard characteristics | non-combustible; Toxic selenide smoke from fire scene |
| storage and transportation characteristics | warehouse low temperature, ventilation, dry; With oxidant, strong acid, separate storage of food raw materials |
| extinguishing agent | depending on the surrounding chemicals |
| Occupational Standard | TWA 0.2 mg (selenium)/m3; Tel 0.3 mg (selenium)/M3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:21:28
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Raw Materials for Selenium dioxide
Downstream Products for Selenium dioxide