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| | Selenium trioxide Basic information |
| Product Name: | Selenium trioxide | | Synonyms: | Selenium trioxide;Selenium(VI) oxide;Selenium(VI) trioxide;Selenium oxide (SeO3) (6CI,7CI,8CI,9CI);Selenium trioxide ISO 9001：2015 REACH | | CAS: | 13768-86-0 | | MF: | O3Se | | MW: | 126.96 | | EINECS: | 237-385-1 | | Product Categories: | | | Mol File: | 13768-86-0.mol |  |
| | Selenium trioxide Chemical Properties |
| Melting point | 118°C | | Boiling point | decomposes at 180℃ [CRC10] | | density | 3.440 | | form | white tetragonal crystals | | Water Solubility | dissolves in H2O forming selenic acid [KIR82] | | EPA Substance Registry System | Selenium oxide (SeO3) (13768-86-0) |
| RIDADR | 3283 | | HazardClass | 6.1 | | PackingGroup | II |
| | Selenium trioxide Usage And Synthesis |
| Chemical Properties | white crystal(s); hygroscopic; can be prepared by reacting SO3 with potassium selenate or phosphorus pentoxide with selenic acid; strong oxidizing agent; stable in dry air at room temperatures; decomposes, if heated, first to selenium pentoxide, then to the dioxide [KIR82] | | General Description | White Solid. | | Air & Water Reactions | Reacts vigorously with water to form selenic acid solution. | | Reactivity Profile | Inorganic oxidizing agents, such as Selenium trioxide, can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). The chemical reduction of materials in this group can be rapid or even explosive, but often requires initiation (heat, spark, catalyst, addition of a solvent). Explosive mixtures of inorganic oxidizing agents with reducing agents often persist unchanged for long periods if initiation is prevented. Such systems are typically mixtures of solids, but may involve any combination of physical states. Some inorganic oxidizing agents are salts of metals that are soluble in water; dissolution dilutes but does not nullify the oxidizing power of such materials. Organic compounds in general have some reducing power and can in principle react with compounds in this class. Actual reactivity varies greatly with the identity of the organic compound. Inorganic oxidizing agents can react violently with active metals, cyanides, esters, and thiocyanates. | | Health Hazard | Absorption of selenium may be demonstrated by presence of the element in the urine and by a garlic-like odor of breath. Inhalation can cause bronchial spasms, symptoms of asphyxiation, and pneumonitis. Acute symptoms of ingestion include sternal pain, cough, nausea, pallor, coated tongue, gastrointestinal disorders, nervousness and conjunctivitis. Contact with eyes or skin causes irritation. |
| | Selenium trioxide Preparation Products And Raw materials |
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