Vanadium (IPAEng|vəˈneɪdiəm) is a
chemical elementthat has the symbol V and atomic number23. A soft and ductile element, vanadium naturally occurs in about 65 different minerals and is used mainly to produce certain alloys. It is one of the 596 elements found in most living organisms.
Vanadium is a soft and ductile, silver-grey metal. It has good resistance to
corrosionby alkalis, sulfuric and hydrochloric acid. It oxidizes readily at about 933 K (660 C). Vanadium has good structural strength and a low fission neutron cross section, making it useful in nuclear applications. Although a metal, it shares with chromiumand manganesethe property of having valency oxides with acidproperties.
oxidation states of vanadium include +2, +3, +4 and +5. A popular experiment with ammonium vanadate NH4VO3, reducing the compound with zincmetal, can demonstrate colorimetrically all four of these vanadium oxidation states. An oxidation state of +1 is rarely seen.
Approximately 80% of vanadium produced is used as
ferrovanadiumor as a steeladditive.Fact|date=September 2008 Other uses:
* In such
stainless steel, e.g. for use in surgical instruments and tools.
rustresistant and high speed tool steels.
** mixed with
aluminiumin titaniumalloys used in jet engines and high-speed airframes
* Vanadium steel alloys are used in
axles, crankshafts, gears, and other critical components.
* It is an important
carbidestabilizer in making steels.
* Because of its low fission
neutroncross section, vanadium has nuclear applications.
* Vanadium foil is used in
claddingtitanium to steel.
Vanadium-galliumtape is used in superconducting magnets (175,000 gauss).
* Vanadium pentoxide V2O5 is used as a
catalystin manufacturing sulfuric acid(via the contact process) and maleic anhydride. It is also used in making ceramics and glassmanufacturing.
* Glass coated with
vanadium dioxideVO2 can block infrared radiation(and not visible light) at a specific temperature.
fuel cells and storage batteries such as vanadium redox batteries.
* Added to
corundumto make simulated alexandritejewelry.
* Vanadate electrochemical conversion coatings for protecting steel against rust and corrosion
Lithium vanadium oxideis proposed for use as a high energy density anode for lithium ion batteries, at 745Wh/l when paired with a lithium cobalt oxidecathode. [http://techon.nikkeibp.co.jp/article/HONSHI/20080129/146549/]
* Used to make lacrosse shafts
* Possibly used to make
Wootz steeland Damascus steel.
Vanadium (named after
Vanadis, another name for Freya, the Scandinavian goddess of fertility) was originally discovered by Andrés Manuel del Río(a Spanish-born Mexican mineralogist) in Mexico City, in 1801. He discovered the element after being sent a sample of "brown lead" ore (now named vanadinite). Through experimentation, he found it to form salts with a wide variety of colors, so he named the element panchromium (Greek: all colors). He later renamed this compound erythronium, since most of the salts turned red when heated. The French chemist Hippolyte Victor Collet-Descotilsincorrectly declared that del Río's new element was only impure chromium. Del Río thought himself to be mistaken and accepted the statement of the French chemist that was also backed by del Río's friend Baron Alexander von Humboldt.cite journal
title = The Road to Chemical Names and Eponyms: Discovery, Priority, and Credit
author = Pedro Cintas
journal = Angewandte Chemie International Edition
volume = 43
issue = 44
pages = 5888 – 5894
year = 2004
doi = 10.1002/anie.200330074 ]
1831, Sefström of Swedenrediscovered vanadium in a new oxide he found while working with some ironores and later that same year Friedrich Wöhlerconfirmed del Río's earlier work.cite journal
title = Ueber das Vanadin, ein neues Metall, gefunden im Stangeneisen von Eckersholm, einer Eisenhütte, die ihr Erz von Taberg in Småland bezieht
author = N. G. Sefström
Annalen der Physik und Chemie
volume = 97
issue = 1
pages = 43 – 49
year = 1831
doi = 10.1002/andp.18310970103 ] Later,
George William Featherstonhaugh, one of the first US geologists, suggested that the element should be named "rionium" after del Río, but this never happened.
Metallic vanadium was isolated by
Henry Enfield Roscoein 1867, who reduced vanadium(III) chlorideVCl3 with hydrogen.cite journal
title = Researches on Vanadium.--Part II.
author = Henry E. Roscoe
Proceedings of the Royal Society of London
volume = 18
pages = 37–42
year =1869 – 1870
url = http://www.jstor.org/stable/112705
doi = ] The name vanadium comes from
Vanadis, a goddess in Scandinavian mythology, because the element has beautiful multicolored chemical compounds.
Vanadium is mined mostly in
South Africa, Namibia, Botswana, Zimbabwe, Zambia, north west China, the Great Plainsof USA, eastern Russiaand Kazakhstan.
= Biological role = In
biology, a vanadium atom is an essential component of some enzymes, particularly the vanadium nitrogenaseused by some nitrogen-fixing micro-organisms. Vanadium is essential to ascidians or sea squirts in vanadium chromagen proteins. The concentration of vanadium in their blood is more than 100 times higher than the concentration of vanadium in the seawater around them. Rats and chickens are also known to require vanadium in very small amounts and deficiencies result in reduced growth and impaired reproduction.Fact|date=September 2008
Ten percent of the
blood cellpigment of the sea cucumberis vanadium. Just as the horseshoe crabhas blue blood rather than red blood (colored by iron in hemoglobin) because of copperin the hemocyaninpigment, the blood of the sea cucumber is yellow because of the vanadium in the vanabin pigment [cite web | last = Natkin | first = Michael | title = Blood Color | work = Science Facts | publisher = Soak (Source Of All Knowledge) | date = 2007 | url = http://www.soak.com/topic/sciencefacts/article/tshow/98556/blood+color | accessdate = 2007-11-16 ] . Nonetheless, there is no evidence that vanabins carry oxygen, in contrast to hemoglobin and hemocyanin. A form of vanadium, vanadyl sulfate, seems to improve glucose control in people with type 2 diabetes.cite journal| journal = Diabetes | volume = 45| issue = | year = 1996| pages = 659–66| title = Oral vanadyl sulfate improves insulin sensitivity in NIDDM but not in obese nondiabetic subjects.| last = Halberstam| first = M, et al| url = | format = | accessdate =| doi = 10.2337/diabetes.45.5.659| pmid = 8621019 ] cite journal| journal = Metabolism | volume = 45| issue = | year = 1996;| pages = 1130–5| title = Effects of vanadyl sulfate on carbohydrate and lipid metabolism in patients with non-insulin dependent diabetes mellitus.| last = Boden| first = G, et al| url = | format = | accessdate =| doi = 10.1016/S0026-0495(96)90013-X ] cite journal| journal = Metabolism | volume = 49| issue = | year = 2000| pages = 400–10| title = Metabolic effects of vanadyl sulfate in humans with non-insulin-dependent diabetes mellitus: in vivo and in vitro studies.| last = Goldfine | first = AB, et al| url = | format = | accessdate =| doi = 10.1016/S0026-0495(00)90418-9 ] cite journal| journal = Altern Complement Med.| volume = 5| issue = | year = 1999| pages = 273–291| title = Vanadium: a review of its potential role in the fight against diabetes.| last = Badmaev| first = V, et al| url = | format = | accessdate =| doi = 10.1089/acm.1999.5.273 ] cite journal| journal = J Biol Chem| volume = 274| issue = | year = 1999| pages = 26617–26624 title = L-glutamic acid gamma-monohydroxamine. A potentiator of vanadium-evoked glucose metabolism in vitro and in vivo.| last = Goldwaser| first = I, et al| url = | format = | accessdate =
doi = 10.1074/jbc.274.37.26617
title = L-Glutamic Acid gamma -Monohydroxamate. A POTENTIATOR OF VANADIUM-EVOKED GLUCOSE METABOLISM IN VITRO AND IN VIVO
pmid = 10473627 ]
Several species of macrofungi, namely "Amanita muscaria" and related species, are known as effective accumulators of vanadium (up to 500 mg/kg in dry weight). Vanadium is present as an organometallic compound (called amavadine) in fungal fruit-bodies. However, the biological importance of the accumulation process is unknown. Fact|date=September 2008
Mineral supplement in drinking water
Most continental waters show a vanadium concentration of less than 3
ppb. However, the groundwater of Mt. Fujicontains a very high concentration of vanadium—up to 150 ppb. This vanadium is solubilized from the basalt by the groundwater. The vanadium content in Mt. Fuji becomes higher at places nearer the summit and deeper in the ground. Recently this high-vanadium water of Mt. Fuji has been sold by many companies as an agent to cope with diabetes. However, there is no concrete evidence for its efficacy. The rainbow trout living in the Mt. Fuji water showed much higher accumulation of vanadium in kidneys and bone.Fact|date=September 2008
Vanadium is never found unbound in nature but it does occur in about 65 different
minerals among which are patroniteVS4, vanadinitePb5(VO4)3Cl, and carnotiteK2(UO2)2(VO4)2.3H2O.
By far the greatest proportion of the world's vanadium production is sourced from vanadium-bearing
magnetitefound in ultramafic gabbrobodies. From these ores vanadium can be calcined to form ferrovanadium, or can be recovered from the vanadium steel smelting process which is widely used in Russia and China.
Vanadium is also present in
bauxite, and in carboncontaining deposits such as crude oil, coal, oil shaleand tarsands. Vanadium has also been detected spectroscopically in light from the Sunand some other stars.
Much of the vanadium metal being produced is now made by
calciumreduction of V2O5 in a pressure vessel. Vanadium is usually recovered as a by-product or co-product, and so world resources of the element are not really indicative of available supply.
:"See also ."
Vanadium is available commercially and production of a sample in the
laboratoryis not normally required. Commercially, routes leading to metallic vanadium as main product are not usually required as enough is produced as byproductin other processes.
In industry, heating of vanadium ore or residues from other processes with salt NaCl or
sodium carbonateNa2CO3 at about 850°C gives sodium vanadate NaVO3. This is dissolved in water and acidified to give a red solid which in turn is melted to form a crude form of vanadium pentoxideV2O5. Reduction of vanadium pentoxide with calciumgives pure vanadium. An alternative suitable for small scales is the reduction of vanadium pentachloride VCl5 with hydrogenor magnesium. Many other methods are also in use.
Industrially, most vanadium is used as an additive to improve
steels. Rather than proceed via pure vanadium metal it is often sufficient to react the crude of vanadium pentoxide V2O5 with crude iron. This produces ferrovanadium suitable for further work.
Vanadium pentoxide V2O5 is used as a catalyst principally in the production of sulfuric acid. It is the source of vanadium used in the manufacture of ferrovanadium. It can be used as a dye and color-fixer.
Vanadyl sulfate VOSO4, also called
vanadium(IV) sulfateoxide hydrate, is used as a relatively controversial dietary supplement, primarily for increasing insulinsensitivity and body-building. Whether it works for the latter purpose has not been proven, and there is some evidence that athletes who take it are merely experiencing a placebo effect.
Anhydrous VCl4 is a liquid at room temperature and reacts violently with water; it can be used, in conjunction with an appropriate nitrogen compound, for vapour deposition of hard VN layers [http://www3.interscience.wiley.com/cgi-bin/abstract/109609704/ABSTRACT] . Vanadium pentafluoride is an extremely powerful
fluorinating agent, capable of perfluorinating chloroalkanes [http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGD-4D5KSCG-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0e95853a43997369cb00b05980e7f894] , and has been proposed (eg [http://www.isrd.tpu.ru/english/orion/html/11-2.htm] ) as a safe and economical substitute for XeF2( Xenon difluoride)); it is also liquid at room temperature.
Orthovanadate VO43- is used in biochemistry as a
phosphateanalogue; in protein crystallographyit can be used to make phosphate binding sites very visible in electron density.
polyoxometalatecluster compounds, including V10 O24.
Toxicity of vanadium compounds
The toxicity of vanadium depends on its physico-chemical state; particularly on its valence state and solubility. Tetravalent VOSO4 has been reported to be more than 5 times as toxic as trivalent V2O3 (Roschin, 1967). Vanadium compounds are poorly absorbed through the gastrointestinal system. Inhalation exposures to vanadium and vanadium compounds result primarily in adverse effects to the respiratory system (Sax, 1984; ATSDR, 1990; Ress et al., 2003; Worle-Knirsch et al., 2007). Quantitative data are, however, insufficient to derive a subchronic or chronic inhalation reference dose. Other effects have been reported on blood parameters after oral or inhalation exposures (Scibior et al., 2006; Gonzalez-Villalva et al., 2006), on liver (Kobayashi et al., 2006), neurological development in rats (Soaso and Garcia, 2007), and other organs.
There is little evidence that vanadium or vanadium compounds are reproductive toxins or teratogens. Vanadium pentoxide was reported to be carcinogenic in male rats and male and female mice by inhalation in an NTP study (Ress et al., 2003), although the interpretation of the results has recently been disputed (Duffus, 2007). Vanadium has not been classified as to carcinogenicity by the U.S. EPA (1991a).
Various oxidation states of vanadium ions
It is known that vanadium gets the oxidation states +2, +3, +4, +5.To observe the colors of these states,
ammonium metavanadate(NH4VO3) can be used as a starting agent. It must be acidified beforehand so dioxovanadium(V) ion, VO2+ (yellow +5 oxidation number) is produced. In alkaline medium, the stable form of vanadium(V) state is VO3-.
zincpowder and concentrated hydrochloric acidcontinuously, VO2+ is reduced into blue VO2+.
It can be seen that during the reaction, the mixture is green in colour as the original yellow of the +5 state and the blue of the +4 are present.
Continuously adding Zn powder and concentrated HCl, blue VO2+ is reduced to green V3+. V3+ is then reduced to violet V2+ by Zn powder and concentrated HCl again.
:"See also .":"See also
Naturally occurring vanadium is composed of one stable
isotope51V and one radioactive isotope 50V with a half-lifeof 1.5×1017 years. 24 artificial radioisotopes have been characterized (in the range of mass numberbetween 40 and 65) with the most stable being 49V with a half-life of 330 days, and 48V with a half-life of 15.9735 days. All of the remaining radioactiveisotopes have half-lives shorter than an hour, the majority of them below 10 seconds. In 4 isotopes, metastable excited states were found (including 2 metastable states for 60V).
decay modebefore the most abundant stable isotope 51V is electron capture. The next most common mode is beta decay. The primary decay products before 51V are element 22 ( titanium) isotopes and the primary products after are element 24 ( chromium) isotopes.
Powdered metallic vanadium is a fire hazard, and unless known otherwise, all vanadium compounds should be considered highly toxic. Generally, the higher the oxidation state of vanadium, the more toxic the compound is. The most dangerous compound is
Occupational Safety and Health Administration(OSHA) has set an exposure limit of 0.05 mg/m3 for vanadium pentoxide dust and 0.1 mg/m3 for vanadium pentoxide fumes in workplace air for an 8-hour workday, 40-hour work week.
National Institute for Occupational Safety and Health(NIOSH) has recommended that 35 mg/m3 of vanadium be considered immediately dangerous to life and health. This is the exposure level of a chemical that is likely to cause permanent health problems or death.
* [http://periodic.lanl.gov/elements/23.html Los Alamos National Laboratory – Vanadium]
*"High vanadium content in Mt.Fuji groundwater and its relevance to the ancient biosphere by Tatsuo Hamada in Vanadium in Environment. Part 1: Chemistry and Biochemistry. Edited by Jerome O. Nriagu. Page 97-123. 1998. John Wilen & Sons, Inc."
*cite journal |last=Duffus |first=J. H. |authorlink= |coauthors= |year=2007 |month= |title=Carcinogenicity classification of vanadium pentoxide and inorganic vanadium compounds, the NTP study of carcinogenicity of inhaled vanadium pentoxide, and vanadium chemistry |journal=Regulatory Toxicology and Pharmacology |volume=47 |issue=1 |pages=110–114 |doi=10.1016/j.yrtph.2006.08.006 |url= |accessdate= |quote=
*cite journal |last=Gonzalez-Villalva |first=A. |authorlink= |coauthors="et al." |year= |month= |title=Thrombocytosis induced in mice after subacute and subchronic V2O5 inhalation |journal=Toxicology and Industrial Health |volume=22 |issue=3 |pages=113–116 |doi=10.1191/0748233706th250oa |url= |accessdate= |quote=
*cite journal |last=Kobayashi |first=K. |authorlink= |coauthors="et al." |year=2006 |month= |title=Pentavalent vanadium induces hepatic metallothionein through interleukin-6-dependent and -independent mechanisms |journal=Toxicology |volume=228 |issue=2–3 |pages=162–170 |doi=10.1016/j.tox.2006.08.022 |url= |accessdate= |quote=
*cite journal |last=Ress |first=N. B. |authorlink= |coauthors="et al." |year=2003 |month= |title=Carcinogenicity of inhaled vanadium pentoxide in F344/N rats and B6C3F1 mice |journal=Toxicological Sciences |volume=74 |issue=2 |pages=287–296 |doi=10.1093/toxsci/kfg136 |url= |accessdate= |quote=
*cite journal |last=Ścibior |first=A. |authorlink= |coauthors=Zaporowska, H.; Ostrowski, J. |year=2006 |month= |title=Selected haematological and biochemical parameters of blood in rats after subchronic administration of vanadium and/or magnesium in drinking water |journal=Archives of Environmental Contamination and Toxicology |volume=51 |issue=2 |pages=287–295 |doi=10.1007/s00244-005-0126-4 |url= |accessdate= |quote=
*cite journal |last=Soazo |first=Marina |authorlink= |coauthors=Garcia, Graciela Beatriz |year=2007 |month= |title=Vanadium exposure through lactation produces behavioral alterations and CNS myelin deficit in neonatal rats |journal=Neurotoxicology and Teratology |volume=29 |issue=4 |pages=503–510 |doi=10.1016/j.ntt.2007.03.001 |url= |accessdate= |quote=
*cite journal |last=Wörle-Knirsch |first=Jörg M. |authorlink= |coauthors="et al." |year=2007 |month= |title=Nanoparticulate Vanadium Oxide Potentiated Vanadium Toxicity in Human Lung Cells |journal=Environ. Sci. Technol. |volume=41 |issue=1 |pages=331–336 |doi=10.1021/es061140x |url= |accessdate= |quote=
* [http://www.webelements.com/webelements/elements/text/V/index.html WebElements.com – Vanadium]
* [http://www.mii.org/Minerals/photovan.html Mineral Information Institute – Vanadium]
* [http://www.atsdr.cdc.gov/tfacts58.html ATSDR – ToxFAQs: Vanadium]
* [http://www.ceic.unsw.edu.au/centers/vrb/ The Vanadium Redox Battery was invented at The University of New South Wales]
* [http://www.lenntech.com/Periodic-chart-elements/V-en.htm Vanadium general infos]
* [http://chemed.chem.purdue.edu/demos/main_pages/12.7.html Oxidation States of Vanadium, with video demostration and electrode potentials relevant]
* [http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html Redox chemistry quoted Vanadium as illustrations]
* [http://www.vanadiumconsortium.com The (REACH) Vanadium Consortium]
* [http://www.mrteverett.com/Chemistry/pdictable/q_elements.asp?Symbol=V Comprehensive Data on Vanadium]
Wikimedia Foundation. 2010.
Look at other dictionaries:
VANADIUM — Le vanadium est l’élément chimique de symbole V et de numéro atomique 23. C’est un élément de transition du groupe Va de la classification périodique. Il a été découvert de façon certaine en 1830, dans un minerai de fer suédois, par Nils Gabriel… … Encyclopédie Universelle
Vanadium — Titane ← Vanadium → Chrome … Wikipédia en Français
vanadium — Symbol: V Atomic number: 23 Atomic weight: 50.9415 Soft and ductile, bright white metal. Good resistance to corrosion by alkalis, sulphuric and hydrochloric acid. It oxidizes readily about 933K. There are two naturally occurring isotopes of… … Elements of periodic system
Vanadium — Va*na di*um, n. [NL., fr. Icel. Vanad[=i]s, a surname of the Scandinavian goddess Freya.] (Chem.) A rare element of the nitrogen phosphorus group, found combined, in vanadates, in certain minerals, and reduced as an infusible, grayish white… … The Collaborative International Dictionary of English
Vanadium  — Vanadium (Vanadin) V, Atomgew. 51,2, ein hellgraues, silberglänzendes Pulver, dessen spez. Gew. 5,5 und dessen Schmelzpunkt 1680° ist. Es verhält sich in chemischer Beziehung ähnlich wie Niob und Tantal; oxydiert sich langsam an der Luft,… … Lexikon der gesamten Technik
Vanadium  — Vanadium (Vanadin), V, Atomgew. 51,0, spez. Gew. 5,7, Schmelzpunkt 1715°. Vanadinit ist in Peru und Neu Mexiko abbauwürdig . Die wichtigsten seiner fünf Oxyde sind: Vanadiummonoxyd V2O, Vanadiumtrioxyd V2O3 und Vanadiumpentoxyd… … Lexikon der gesamten Technik
vanadium — rare metallic element, 1833, named 1830 by Swedish chemist Nils Gabriel Sefström (1787 1845), from O.N. Vanadis, one of the names of the Norse beauty goddess Freyja (see FREYA (Cf. Freya)), perhaps because of its colorful compounds … Etymology dictionary
vanadium — [və nā′dē əm] n. [ModL < ON Vanadis,FREYA + IUM: name proposed (1831) by BERZELIUS Baron Jöns Jakob for element discovered independently by N. G. Sefström (1787 1845), Swed chemist, and previously (1801) by A. M. del Rio (1764 1849), Mex… … English World dictionary
Vanadium — Eigenschaften … Deutsch Wikipedia
vanadium — /veuh nay dee euhm/, n. Chem. a rare element occurring in certain minerals and obtained as a light gray powder with a silvery luster or as a ductile metal: used as an ingredient of steel to toughen it and increase its shock resistance. Symbol: V; … Universalium