Vanadium oxide fume

Synonyms/Trade Names Divanadium pentoxide fume, Vanadic anhydride fume. Vanadium oxide fume. Vanadium pentaoxide fume. Other synonyms vary depending upon the specific vanadium compound. 

Vanadium fume S316 Zinc oxide fume... 

Thermal decomposition—Thermal decomposition methods may be used to prepare metal oxide fumes. An aerosol of a precursor to the metal oxide (i.e., a substance that is readily decomposed, thermally, to yield the oxide) is first generated and then is heated by passing it through a heated tube to decompose it to the oxide. Metal formates, oxalates, and the like, which readily yield the oxides and do not produce objectionable side products, are commonly used precursors. In this program, fumes of iron oxide, vanadium oxide, and copper oxide were generated using this method. 

VANADIUM BROMIDE see VEKOOO VANADIUM CHLORIDE see VEFOOO VANADIUM(III) CHLORIDE see VEPOOO VANADIUM COMPOUNDS see VCZOOO VANADIUM DUST and FUME (ACGIH) see VDUOOO VANADIUM DUST and FUME (ACGIH) see VDZOOO VANADIUM (OSHA) see VDZOOO VANADIUM OXIDE see VEAOOO VANADIUM(V) OXIDE see VDUOOO VANADIUM OXYTRICHLORIDE see VDPOOO VANADIUM PENTAOXIDE see VDUOOO VANADIUMPENTOXID (GERMAN) see VDUOOO VANADIUM PENTOXIDE (dust) see VDUOOO VANADIUM PENTOXIDE (fume) see VDZOOO... 

Typical fillers graphite, fumed silica, molybdemun disulfide, vanadium oxide... 

Synonyms Cl 77938 Vanadic acid anhydride Vanadic anhydride Vanadium dust and fume Vanadium oxide... 

Vanadium (V) oxide Vanadium pentaoxide Vanadium pentoxide (dust) Vanadium pentoxide (fume) Vanadium pentoxide, nonfused... 

Additives used in final products Fillers carbon nanotubes, fumed silica, graphite. Fillers molybdenum disulfide, montmorlllonite, nanosilica, titanium dioxide, vanadium oxide Plasticizers dioctyl phthalate, ethylene carbonate, polyoxyethylene-sorbitane monolaureate, propylene carbonate, polyethylene and polypropylene glycols, tetraethylene glycol, tetraglyme Antislatics polyoxyethylene sorbitan monolaurate, polyoxyethylene glycol, polyoxyethylene octylphenyl ether ... 

The adopted values for TWAs for airborne vanadium, including oxide and metal dusts of vanadium, is 0.5 mg/m the values for fumes of vanadium compounds is 0.05 mg/m. These limits are for normal 8-h workday and 40-h work-week exposures. The short-term exposure limit (STEL) is 1.5 mg/m for dusts (25). A description of health ha2ards, including symptoms, first aid, and organ involvement, personal protection, and respirator use has beenpubhshed (26). 

In a 2-1. round-bottomed, 3-necked flask fitted with a stirrer and two large-bore condensers are placed 200 cc. of 50 per cent nitric acid and 0.25 g. of vanadium pentoxide. The flask is heated to 65-70° in a water bath (thermometer in water), and I cc. of cyclopentanone added. Oxidation is indicated by the production of brown fumes. The water bath is removed, and 42 g. (less the i cc.) of the cyclic ketone added from a dropping funnel through the condenser at the rate of a drop every three seconds. The heat of the reaction keeps the flask at about 70°. If the temperature drops, oxidation ceases until the ketone has accumulated, when it may proceed almost explosively. In such a case, or if the temperature is higher, much succinic acid is formed. After addition has been completed, the water bath... 

The effects of various metal oxides and salts which promote ignition of amine-red fuming nitric acid systems were examined. Among soluble catalysts, copperQ oxide, ammonium metavanadate, sodium metavanadate, iron(III) chloride (and potassium hexacyanoferrate(II) with o-toluidine) are most effective. Of the insoluble materials, copper(II) oxide, iron(III) oxide, vanadium(V) oxide, potassium chromate, potassium dichromate, potassium hexacyanoferrate(III) and sodium pentacyanonitrosylferrate(II) were effective. 

Welding Fumes, gases oxides of cadmium, chromium, fluorides, iron, manganese, nickel, nitrogen, vanadium, by-products from fluxes, coatings, electrodes... 

Orthophthalic acid is made by the oxidation of naphthalene (1) with H2SCL fuming heated, in the presence of mercuric sulfate —SO2 is also formed and recovered (2 ) with air in the presence of vanadium pentoxide at 450 to 520°C. Orthophthalic acid also is formed when benzene compounds containing carbon ortho-substituted groups are oxidized. Orthophthalic arid is used in the manufacture of indigo and other dyes,... 

The effect of inorganic additives upon ignition delay in anilinium nitrate—red fuming nitric acid systems was examined. The insoluble compounds copper(I) chloride, potassium permanganate, sodium pentacyanonitrosylferrate and vanadium(V) oxide were moderately effective promoters, while the soluble ammonium or sodium metavanadates were very effective, producing vigorous ignition. 

OSHA PEL Respirable Dust and Fume TWA 0.05 mg(V205)/m3 NIOSH REL TWA 1.0 mg(V)/m3 SAFETY PROFILE An inhalation hazard. Poison by subcutaneous route. Questionable carcinogen with experimental tumorigenic data. Flammable in dust form from heat, flame, or sparks. Violent reaction with BrFs, CI2, lithium, nitryl fluoride, oxidants. When heated to decomposition it emits toxic fumes of VOx. See also VANADIUM COMPOUNDS. 

VANADIUM DUST and FUME (ACGIH) VANAD-IUM(V) OXIDE VANADIUM PENTAOXIDE VANADIUMPENTOXID (GERMAN) VANADIUM PENTOXIDE, non-fused form (DOT) VANADIUM-PENTOXYDE (DUTCH) VANADIUM, PENTOXYDE de (FRENCH) WANADU PIECIOTLENEK (POLISH)... 

Chromium(VI) oxide nitrate and vanadium(V) oxide nitrate were first prepared by Schmeisser and Lutzow by the reaction of chromium(VI) oxide and vanadium(V) oxide with nitrogen(V) oxide. The nitrogen(V) oxide was prepared in the solid state by dehydration of fuming nitric acid with phosphorus(V) oxide. The method described below simplifies the preparation of anhydrous nitrogen(V) oxide and shortens significantly the time required. The products obtained can be protected from hydrolysis by totally excluding water from the all-glass system. 

Vanadium (V) oxide nitrate is a pale yellow, viscous liquid which boils at 64 to 65° at 0.7 mm. Hg pressure. It is soluble in carbon tetrachloride. It reacts immediately with water to form nitric acid and a dark red-brown precipitate of impure vanadium(V) oxide. It is a powerful oxidizing agent and ignites most hydrocarbons with which it comes in contact. It attacks paper, wood, and rubber in the same manner as fuming nitric acid does. It can be stored for considerable lengths of time in a sealed ampul in the absence of light and moisture, and it can be purified by vacuum distillation. 

The chief interference is from Fe(lll), which forms a green complex with chromotropic acid. Before the determination of Ti, larger quantities of iron should be separated or smaller ones reduced with ascorbic acid or sulphite. Vanadium in quantities not exceeding those of titanium has no appreciable effect on the determination of Ti. Molybdenum at concentrations below 50 pg/ml does not interfere. Fluoride interferes by masking titanium, but can be removed by fuming with H2SO4. Oxidants (e.g. HNO3) must be absent because chromotropic acid is fairly easily oxidized. 

VANADIUM TRICHLORIDE OXIDE (7727-18-6) Reacts with moisture in air, forming hydrogen chloride fumes. Reacts with water, forming hydrochloric acid. Air contact causes formation of corrosive hydrogen chloride fumes. Reacts violently with many substances, including bases, sodium, potassium. Aqueous solution incompatible with sulfuric acid, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, epichlorohydrin, organic anhydrides, isocyanates, nitromethane, vinyl acetate. Attacks metals in the presence of moisture. 

Vanadium(V) oxide dust or fume [Vanadium pentoxide] V703 1314-62-1 0.05 mg/m ... 

Vanadium is mainly absorbed via the respiratory and gastrointestinal routes. The oxidation state of vanadium does not appear to influence absorption (Carson et al.. 1986). In occupational exposure the main route of absorption is by inhalation of dust and fumes containing vanadium or vanadium compounds. 

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