Difference between revisions of "Antimony" - New World Encyclopedia
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== Compounds == | == Compounds == | ||
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− | '' | + | * [[Antimony pentafluoride]] (SbF<sub>5</sub>) |
+ | |||
+ | * '''[[Antimony trioxide]]*''' (Sb<sub>2</sub>O<sub>3</sub>): It is the most important commercial compound of antimony. Its industrial preparation mainly involves roasting antimonide minerals. It is used as: a flame retardant for textiles and polymers; a [[pigment]]; and an opacifying agent for [[glass]]es, [[ceramic]]s and [[enamel]]s. This compound is only weakly absorbed by the digestive system, and the main route of exposure is by inhalation of the dust. Acute poisoning is rare, and the signs are fairly noncharacteristic (vomiting, abdominal pain, irritation of the mucous membranes, diarrhea, cardiac irregularities). Long-term exposure leads to chronic toxicity, indicated by irritation of skin and respiratory tract, with a characteristic [[pneumoconosis]]* visible on chest [[X ray]]s. Antimony trioxide is known to pass into breast milk and to traverse the placenta. | ||
+ | |||
+ | * [[Stibine]] (antimony trihydride, SbH<sub>3</sub>) | ||
+ | |||
+ | * [[Indium antimonide]] (InSb) | ||
== Applications == | == Applications == | ||
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− | + | The most important use of antimony is as a hardener in lead for storage batteries. In addition, antimony is increasingly being used in the [[semiconductor]] industry in the production of [[diode]]s, [[infrared]] detectors, and [[Hall effect|Hall-effect]]* devices. | |
+ | |||
+ | Antimony (particularly as an [[alloy]]) is also used in: | ||
+ | *antifriction alloys | ||
+ | *[[type metal]]* | ||
+ | *small arms and [[tracer bullet]]*s | ||
+ | *cable sheathing | ||
+ | *plumbing | ||
+ | *soldering (some "lead-free" solders contain 5% antimony) | ||
+ | *main and big-end bearings in [[internal combustion engine]]s | ||
+ | *[[linotype]]* printing machines | ||
− | + | Antimony compounds—particularly the [[oxide]]s, [[sulfide]]s, sodium antimonate, and antimony trichloride—are used in the making of flame-proofing compounds, [[ceramic]] enamels, [[glass]], [[paint]]s, and [[pottery]]. Antimony trioxide is the most important of the antimony compounds and is primarily used in flame-retardant formulations. These flame-retardant applications include such markets as children's clothing, toys, aircraft and automobile seat covers. Also, antimony sulfide is one of the ingredients in modern matches. | |
− | + | === Medical uses === | |
+ | |||
+ | * [[Stibnite]]*, the natural sulfide of antimony, was known and used in Biblical times as [[medicine]], and it is still used as such in some developing countries. | ||
+ | * Antimony was used in the past for the treatment of [[schistosomiasis]]*, but it has been replaced by another drug (Praziquantel). Antimony attaches itself to the [[sulfur]] atoms of certain [[enzyme]]s that are used by both the parasite and human host. Small doses can kill the parasite without significantly harming the patient. | ||
+ | * Antimony and its compounds are used in several [[veterinary]] preparations. For instance, Anthiomaline or Lithium antimony thiomalate is used as a skin conditioner in ruminants. Antimony has a nourishing or conditioning effect on keratinized tissues, at least in animals. | ||
== Precautions == | == Precautions == | ||
[[Image:Skull and crossbones.svg|left|80px]] | [[Image:Skull and crossbones.svg|left|80px]] | ||
− | |||
− | + | Antimony and many of its compounds are [[toxic]]*. Clinically, antimony poisoning is very similar to [[arsenic]] poisoning. In small doses, antimony causes [[headache]]*, [[dizziness]]*, and [[Depression (mood)|depression]]*. Larger doses cause violent and frequent vomiting, and will lead to death in a few days. | |
− | + | ||
− | + | In the past, small doses have been reported in some acidic fruit drinks. The acidic nature of the drink was sufficient to dissolve small amounts of antimony oxide in the packaging for the drink. Modern manufacturing methods, however, avoid this problem. Also, a study has found that antimony is leached from [[polyethylene terephthalate]]* (PET) bottles, but at levels below drinking water guidelines. | |
− | + | ||
− | + | The guidelines for maximum permissible levels of antimony in drinking water are as follows.<ref>Shotyk, William; Krachler, Michael; Chen, Bin [http://www.rsc.org/delivery/_ArticleLinking/DisplayHTMLArticleforfree.cfm?JournalCode=EM&Year=2006&ManuscriptID=b517844b&Iss=2 Contamination of Canadian and European bottled waters with antimony from PET containers] ''J. Environ. Monit'' 2006, 8, 288-292 DOI: 10.1039/b517844b</ref> | |
+ | * World Health Organization (WHO): 20 micrograms per liter (ug/L) | ||
+ | * U.S. EPA, Health Canada, and the Ontario Ministry of Environment: 6 ug/L | ||
+ | * German Federal Ministry of Environment: 5 ug/L | ||
+ | * Japan: 2 ug/L | ||
− | + | ==Footnotes== | |
+ | <references/> | ||
==References== | ==References== | ||
− | + | ||
*[http://periodic.lanl.gov/elements/51.html Los Alamos National Laboratory – Antimony] | *[http://periodic.lanl.gov/elements/51.html Los Alamos National Laboratory – Antimony] | ||
*[http://www.atsdr.cdc.gov/toxprofiles/phs23.html Public Health Statement for Antimony] | *[http://www.atsdr.cdc.gov/toxprofiles/phs23.html Public Health Statement for Antimony] | ||
*[http://elements.vanderkrogt.net/elem/sb.html Antymony] - detailed history of antimony | *[http://elements.vanderkrogt.net/elem/sb.html Antymony] - detailed history of antimony | ||
+ | * Institut national de recherche et de sécurité (INRS), ''Fiche toxicologique nº 198 : Trioxyde de diantimoine'', 1992. | ||
==See also== | ==See also== | ||
− | *[[ | + | |
+ | * [[Arsenic]] | ||
+ | * [[Chemical element]] | ||
+ | * [[Periodic table]] | ||
== External links == | == External links == | ||
− | + | ||
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* [http://www.npi.gov.au/database/substance-info/profiles/10.html National Pollutant Inventory - Antimony and compounds] | * [http://www.npi.gov.au/database/substance-info/profiles/10.html National Pollutant Inventory - Antimony and compounds] | ||
*[http://www.webelements.com/webelements/elements/text/Sb/index.html WebElements.com – Antimony] | *[http://www.webelements.com/webelements/elements/text/Sb/index.html WebElements.com – Antimony] | ||
* [http://www.vanderkrogt.net/elements/elem/sb.html Elementymology & Elements Multidict: Antimony] (by Peter van der Krogt) | * [http://www.vanderkrogt.net/elements/elem/sb.html Elementymology & Elements Multidict: Antimony] (by Peter van der Krogt) | ||
* [http://www.indexmundi.com/en/commodities/minerals/antimony/antimony_table09.html World Mine Production of Antimony, by Country] | * [http://www.indexmundi.com/en/commodities/minerals/antimony/antimony_table09.html World Mine Production of Antimony, by Country] | ||
+ | * [http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/_icsc00/icsc0012.htm International Chemical Safety Card 0012] | ||
+ | * [http://ecb.jrc.it/ European Chemicals Bureau] | ||
[[Category:Physical sciences]] | [[Category:Physical sciences]] |
Revision as of 22:59, 23 October 2006
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General | |||||||||||||||||||||||||
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Name, Symbol, Number | antimony, Sb, 51 | ||||||||||||||||||||||||
Chemical series | metalloids | ||||||||||||||||||||||||
Group, Period, Block | 15, 5, p | ||||||||||||||||||||||||
Appearance | silvery lustrous grey | ||||||||||||||||||||||||
Atomic mass | 121.760(1) g/mol | ||||||||||||||||||||||||
Electron configuration | [Kr] 4d10 5s2 5p3 | ||||||||||||||||||||||||
Electrons per shell | 2, 8, 18, 18, 5 | ||||||||||||||||||||||||
Physical properties | |||||||||||||||||||||||||
Phase | solid | ||||||||||||||||||||||||
Density (near r.t.) | 6.697 g/cm³ | ||||||||||||||||||||||||
Liquid density at m.p. | 6.53 g/cm³ | ||||||||||||||||||||||||
Melting point | 903.78 K (630.63 °C, 1167.13 °F) | ||||||||||||||||||||||||
Boiling point | 1860 K (1587 °C, 2889 °F) | ||||||||||||||||||||||||
Heat of fusion | 19.79 kJ/mol | ||||||||||||||||||||||||
Heat of vaporization | 193.43 kJ/mol | ||||||||||||||||||||||||
Heat capacity | (25 °C) 25.23 J/(mol·K) | ||||||||||||||||||||||||
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Atomic properties | |||||||||||||||||||||||||
Crystal structure | rhombohedral | ||||||||||||||||||||||||
Oxidation states | −3, 3, 5 | ||||||||||||||||||||||||
Electronegativity | 2.05 (Pauling scale) | ||||||||||||||||||||||||
Ionization energies (more) |
1st: 834 kJ/mol | ||||||||||||||||||||||||
2nd: 1594.9 kJ/mol | |||||||||||||||||||||||||
3rd: 2440 kJ/mol | |||||||||||||||||||||||||
Atomic radius | 145 pm | ||||||||||||||||||||||||
Atomic radius (calc.) | 133 pm | ||||||||||||||||||||||||
Covalent radius | 138 pm | ||||||||||||||||||||||||
Miscellaneous | |||||||||||||||||||||||||
Magnetic ordering | no data | ||||||||||||||||||||||||
Electrical resistivity | (20 °C) 417 nΩ·m | ||||||||||||||||||||||||
Thermal conductivity | (300 K) 24.4 W/(m·K) | ||||||||||||||||||||||||
Thermal expansion | (25 °C) 11.0 µm/(m·K) | ||||||||||||||||||||||||
Speed of sound (thin rod) | (20 °C) 3420 m/s | ||||||||||||||||||||||||
Speed of sound (thin rod) | (r.t.) 55 m/s | ||||||||||||||||||||||||
Shear modulus | 20 GPa | ||||||||||||||||||||||||
Bulk modulus | 42 GPa | ||||||||||||||||||||||||
Mohs hardness | 3.0 | ||||||||||||||||||||||||
Brinell hardness | 294 MPa | ||||||||||||||||||||||||
CAS registry number | 7440-36-0 | ||||||||||||||||||||||||
Notable isotopes | |||||||||||||||||||||||||
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Antimony (chemical symbol Sb, atomic number 51) is a metalloid with four allotropic forms. The stable form of antimony is a blue-white metal. Yellow and black antimony are unstable nonmetals. The symbol Sb is derived from the Latin word Stibium, which means "mark."
- Antimony is used in flame-proofing, paints, ceramics, enamels, a wide variety of alloys, electronics, and rubber.
Etymology
The derivation of antimony's modern name and its symbol can be traced along a complex path. Antimony sulfide (Sb2S3) was used in some countries as a cosmetic powder, and its Coptic name (CTHM, or "stem") was borrowed by the Greeks, who called it στιβι (stibi). From that came the Latin name stibium, which was then converted in Arabic to انتيمون ([al-]ithmīd). Al-ithmīd, in turn, was later latinized by alchemists to "athimodium," and eventually to "antimonium." The chemical pioneer Jöns Jakob Berzelius abbreviated stibium as Sb in his writings about antimony, and his abbreviation became the standard symbol.
Occurrence
Estimates of the abundance of antimony in the Earth's crust range from 0.2 to 0.5 parts per million (ppm). Despite this low abundance, it is found in over 100 mineral species. It is sometimes found in the native (elemental) state, but it occurs predominantly as the sulfide mineral stibnite (Sb2S3). It is also found associated with lead, copper, and silver.
The People's Republic of China is by far the world's largest producer of antimony. The largest mine in that country is the Xikuangshan mine in Hunan Province. Other producers are Russia, South Africa, Tajikistan, and Bolivia.
Commercially, antimony is generally produced in the form of ingots, broken pieces, granules, and cast cake. Other forms are powder, shot, and single crystals.
Country | Tonnes | % of total |
---|---|---|
People's Republic of China | 126 000 | 81.5 |
Russia | 12 000 | 7.8 |
South Africa | 5 023 | 3.3 |
Tajikistan | 3 480 | 2.3 |
Bolivia | 2 430 | 1.6 |
Top 5 | 148 933 | 96.4 |
Total world | 154 538 | 100.0 |
Chiffres de 2003, métal contenue dans les minerais et concentrés, source : L'état du monde 2005
History
Antimony was recognized in antiquity (3000 B.C.E. or earlier) in various compounds and was prized for its fine casting qualities. The black powder of antimony sulfide (stibium) is soluble in water and was the ancient version of mascara during Roman times. It was used to darken eyebrows and eyelashes, or to draw a line around the perimeter of the eye.
In the traditional history of Middle Eastern alchemy, it is claimed that pure antimony was well-known to the Islamic alchemist Geber (Abu Musa Jabir ibn Hayyan) in the eighth century. This claim, however, is disputed. Marcellin Berthelot, who translated a number of Geber's books, stated that antimony is never mentioned in them. Other authors, however, state that Berthelot translated only some of the less important books, while the more interesting ones (some of which might describe antimony) have yet to be translated.
According to the history of metallurgy, the first description of the procedure to isolate antimony is in the Italian book De la pirotechnia by Vannoccio Biringuccio, published in 1540. This book precedes the more famous Latin book De re metallica of 1556 by Agricola, although the latter has often been incorrectly considered the discoverer of metallic antimony.
The traditional history of Western alchemy maintains that metallic antimony was described (before Biringuccio's book) by the Prior Basilius Valentinus, in the Latin manuscript "Currus Triumphalis Antimonii" of about 1450. It was published in the English translation, "The triumphal chariot of antimony," in 1604, by Johann Thölde (1565-1614). The marvelous finding of all of the Valentinus' manuscripts, as in the alchemical tales, is fully described by Jean-Jacques Manget in his Bibliotheca chemica curiosa (1702). These manuscripts remained enclosed for more than a century in a pillar of St. Peter's Abbey at Erfurt, until the pillar was shattered by a thunderbolt.
Some scholars have considered Basilius Valentinus a mythological personage. The most prominent critic was Leibniz (1646-1716), who declared after a careful search that the Prior Valentinus never existed in the Abbey of Erfurt, but was only a pseudonym, probably of Thölde himself, used to merge poorly translated materials of various origins.
Notable characteristics
In the periodic table, antimony is located in group 15 (formerly group 5A), between arsenic and bismuth. It is thus a member of the nitrogen family of elements, sometimes called the pnictogens (or pnicogens). It lies in period 5, between tin and tellurium.
In its elemental form, antimony is a silvery white, brittle, fusible, crystalline solid. It exhibits poor electrical and thermal conductivity and vaporizes at low temperatures. A metalloid, antimony resembles a metal in appearance and physical properties, but chemically it does not react as a metal. It is attacked by oxidizing acids and halogens. Antimony and some of its alloys are unusual in that they expand on cooling.
Isotopes
Antimony has multiple isotopes, only two of which are stable: 121Sb and 123Sb. Their relative abundances have been calculated to be about 57.36% and 42.64%, respectively. The radioactive isotope 125Sb has a half-life of about 2.76 years, but the other radioisotopes have extremely short half-lives.
Compounds
- Antimony pentafluoride (SbF5)
- Antimony trioxide (Sb2O3): It is the most important commercial compound of antimony. Its industrial preparation mainly involves roasting antimonide minerals. It is used as: a flame retardant for textiles and polymers; a pigment; and an opacifying agent for glasses, ceramics and enamels. This compound is only weakly absorbed by the digestive system, and the main route of exposure is by inhalation of the dust. Acute poisoning is rare, and the signs are fairly noncharacteristic (vomiting, abdominal pain, irritation of the mucous membranes, diarrhea, cardiac irregularities). Long-term exposure leads to chronic toxicity, indicated by irritation of skin and respiratory tract, with a characteristic pneumoconosis visible on chest X rays. Antimony trioxide is known to pass into breast milk and to traverse the placenta.
- Stibine (antimony trihydride, SbH3)
- Indium antimonide (InSb)
Applications
The most important use of antimony is as a hardener in lead for storage batteries. In addition, antimony is increasingly being used in the semiconductor industry in the production of diodes, infrared detectors, and Hall-effect devices.
Antimony (particularly as an alloy) is also used in:
- antifriction alloys
- type metal
- small arms and tracer bullets
- cable sheathing
- plumbing
- soldering (some "lead-free" solders contain 5% antimony)
- main and big-end bearings in internal combustion engines
- linotype printing machines
Antimony compounds—particularly the oxides, sulfides, sodium antimonate, and antimony trichloride—are used in the making of flame-proofing compounds, ceramic enamels, glass, paints, and pottery. Antimony trioxide is the most important of the antimony compounds and is primarily used in flame-retardant formulations. These flame-retardant applications include such markets as children's clothing, toys, aircraft and automobile seat covers. Also, antimony sulfide is one of the ingredients in modern matches.
Medical uses
- Stibnite, the natural sulfide of antimony, was known and used in Biblical times as medicine, and it is still used as such in some developing countries.
- Antimony was used in the past for the treatment of schistosomiasis, but it has been replaced by another drug (Praziquantel). Antimony attaches itself to the sulfur atoms of certain enzymes that are used by both the parasite and human host. Small doses can kill the parasite without significantly harming the patient.
- Antimony and its compounds are used in several veterinary preparations. For instance, Anthiomaline or Lithium antimony thiomalate is used as a skin conditioner in ruminants. Antimony has a nourishing or conditioning effect on keratinized tissues, at least in animals.
Precautions
Antimony and many of its compounds are toxic. Clinically, antimony poisoning is very similar to arsenic poisoning. In small doses, antimony causes headache, dizziness, and depression. Larger doses cause violent and frequent vomiting, and will lead to death in a few days.
In the past, small doses have been reported in some acidic fruit drinks. The acidic nature of the drink was sufficient to dissolve small amounts of antimony oxide in the packaging for the drink. Modern manufacturing methods, however, avoid this problem. Also, a study has found that antimony is leached from polyethylene terephthalate (PET) bottles, but at levels below drinking water guidelines.
The guidelines for maximum permissible levels of antimony in drinking water are as follows.[1]
- World Health Organization (WHO): 20 micrograms per liter (ug/L)
- U.S. EPA, Health Canada, and the Ontario Ministry of Environment: 6 ug/L
- German Federal Ministry of Environment: 5 ug/L
- Japan: 2 ug/L
Footnotes
- ↑ Shotyk, William; Krachler, Michael; Chen, Bin Contamination of Canadian and European bottled waters with antimony from PET containers J. Environ. Monit 2006, 8, 288-292 DOI: 10.1039/b517844b
ReferencesISBN links support NWE through referral fees
- Los Alamos National Laboratory – Antimony
- Public Health Statement for Antimony
- Antymony - detailed history of antimony
- Institut national de recherche et de sécurité (INRS), Fiche toxicologique nº 198 : Trioxyde de diantimoine, 1992.
See also
External links
- National Pollutant Inventory - Antimony and compounds
- WebElements.com – Antimony
- Elementymology & Elements Multidict: Antimony (by Peter van der Krogt)
- World Mine Production of Antimony, by Country
- International Chemical Safety Card 0012
- European Chemicals Bureau
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