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Copper is a with the symbol Cu (from cuprum) and 29. It is a metal with very high and . Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color. It is used as a conductor of heat and electricity, a building material, and a constituent of various metal .

The metal and have been used for thousands of years. In the Roman era, copper was principally mined on , hence the origin of the name of the metal as сyprium (metal of Cyprus), later shortened to сuprum. Its compounds are commonly encountered as copper(II) salts, which often impart blue or green colors to minerals such as and and have been widely used historically as pigments. Architectural structures built with copper corrode to give green (or ). prominently features copper, both by itself and as part of pigments.

Copper is essential to all living organisms as a trace because it is a key constituent of the respiratory enzyme complex . In and copper is a constituent of the blood pigment , which is replaced by the iron-complexed in fish and other . The main areas where copper is found in humans are liver, muscle and bone. Copper compounds are used as , , and wood preservatives.

Characteristics
Physical
Copper, and are in of the periodic table, and they share certain attributes: they have one s-orbital electron on top of a filled d- and are characterized by high ductility and electrical conductivity. The filled d-shells in these elements do not contribute much to the interatomic interactions, which are dominated by the s-electrons through . Contrary to metals with incomplete d-shells, metallic bonds in copper are lacking a character and are relatively weak. This explains the low and high of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress thereby increasing its hardness. For this reason, copper is usually supplied in a fine-grained form, which has greater strength than forms. ξ1

The softness of copper partly explains its high electrical conductivity (59.6×106 /m) and thus also high thermal conductivity, which are the second highest among pure metals at room temperature. ξ2 This is because the resistivity to electron transport in metals at room temperature mostly originates from scattering of electrons on thermal vibrations of the lattice, which are relatively weak for a soft metal. The maximum permissible current density of copper in open air is approximately 3.1×106 A/m2 of cross-sectional area, above which it begins to heat excessively. ξ3 As with other metals, if copper is placed against another metal, will occur.

Together with and (both yellow), and (bluish), copper is one of only four elemental metals with a natural color other than gray or silver. ξ4 Pure copper is orange-red and acquires a reddish when exposed to air. The characteristic color of copper results from the electronic transitions between the filled 3d and half-empty 4s atomic shells – the energy difference between these shells is such that it corresponds to orange light. The same mechanism accounts for the yellow color of gold and caesium. ξ5

Chemical
Copper does not react with water, but it slowly reacts with atmospheric oxygen forming a layer of brown-black copper oxide. In contrast to the oxidation of iron by wet air, this oxide layer stops the further, bulk corrosion. A green layer of (copper carbonate) can often be seen on old copper constructions, such as the . Copper when exposed to , which react with it to form various .

Isotopes
There are 29 of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a of 3/2. The other isotopes are , with the most stable being 67Cu with a of 61.83 hours. Seven have been characterized, with 68mCu the longest-lived with a half-life of 3.8 minutes. Isotopes with a above 64 decay by , whereas those with a mass number below 64 decay by . , which has a half-life of 12.7 hours, decays both ways.

62Cu and 64Cu have significant applications. 64Cu is a for X-ray imaging, and complexed with a can be used for cancer. 62Cu is used in 62Cu-PTSM that is a for positron emission tomography.

Occurrence
Copper is synthesized in massive stars and is present in the Earth's crust at a concentration of about 50 parts per million (ppm), ξ6 where it occurs as or in minerals such as the copper sulfides and , copper carbonates and and the mineral . The largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the in , US. Native copper is a , with the largest described single crystal measuring 4.4×3.2×3.2 cm.

Production
Most copper is mined or as copper sulfides from large in deposits that contain 0.4 to 1.0% copper. Examples include in , in Utah, and in New Mexico, United States. According to the , in 2005, Chile was the top mine producer of copper with at least one-third world share followed by the United States, Indonesia and Peru. Copper can also be recovered through the process. Several sites in the state of Arizona are considered prime candidates for this method.http://www.azcentral.com/arizonarepublic/business/articles/2011/06/19/20110619copper-new-method-fight.html The amount of copper in use is increasing and the quantity available is barely sufficient to allow all countries to reach developed world levels of usage.

Reserves
Copper has been in use at least 10,000 years, but more than 96% of all copper ever mined and has been extracted since 1900, and more than half was extracted in only the last 24 years. As with many natural resources, the total amount of copper on Earth is vast (around 1014 tons just in the top kilometer of Earth's crust, or about 5 million years worth at the current rate of extraction). However, only a tiny fraction of these reserves is economically viable, given present-day prices and technologies. Various estimates of existing copper reserves available for mining vary from 25 years to 60 years, depending on core assumptions such as the growth rate. ξ7 Recycling is a major source of copper in the modern world. Because of these and other factors, the future of copper production and supply is the subject of much debate, including the concept of , analogous to .

The price of copper has historically been unstable, and it quintupled from the 60-year low of US$0.60/lb (US$1.32/kg) in June 1999 to US$3.75 per pound (US$8.27/kg) in May 2006. It dropped to US$2.40/lb (US$5.29/kg) in February 2007, then rebounded to US$3.50/lb (US$7.71/kg) in April 2007. In February 2009, weakening global demand and a steep fall in commodity prices since the previous year's highs left copper prices at US$1.51/lb.

Methods
The concentration of copper in ores averages only 0.6%, and most commercial ores are sulfides, especially chalcopyrite (CuFeS2) and to a lesser extent chalcocite (Cu2S). These minerals are concentrated from ores to the level of 10–15% copper by or . Heating this material with silica in removes much of the iron as slag. The process exploits the greater ease of converting iron sulfides into its oxides, which in turn react with the silica to form the silicate slag, which floats on top of the heated mass. The resulting copper matte consisting of Cu2S is then to convert all sulfides into oxides:
2 Cu2S 3 O2 → 2 Cu2O 2 SO2
The cuprous oxide is converted to blister copper upon heating:
2 Cu2O → 4 Cu O2
The Sudbury process converted only half the sulfide to oxide and then used this oxide to remove the rest of the sulfur as oxide. It was then electrolytically refined and the anode mud exploited for the platinum and gold it contained. This step exploits the relatively easy reduction of copper oxides to copper metal. Natural gas is blown across the blister to remove most of the remaining oxygen and is performed on the resulting material to produce pure copper:
Cu2 2 e– → Cu

Recycling
Copper, like aluminium, is 100% recyclable without any loss of quality whether in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the 's , the global per capita stock of copper in use in society is 35–55 kg. Much of this is in more-developed countries (140–300 kg per capita) rather than less-developed countries (30–40 kg per capita).

The process of recycling copper follows roughly the same steps as is used to extract copper, but requires fewer steps. High purity scrap copper is melted in a furnace and then and cast into and ; lower purity scrap is refined by electroplating in a bath of sulfuric acid. "Overview of Recycled Copper" Copper.org. Copper.org (2010-08-25). Retrieved on 2011-11-08.

Alloys
Numerous exist, many with important uses. is an alloy of copper and . usually refers to copper- alloys, but can refer to any alloy of copper such as . Copper is one of the most important constituents of silver and gold alloys and carat solders used in the jewelry industry, modifying the color, hardness and melting point of the resulting alloys.

The alloy of copper and nickel, called , is used in low-denomination , often for the outer cladding. The US 5-cent coin called nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The 90% copper/10% nickel alloy is remarkable by its resistance to corrosion and is used in various parts being exposed to seawater. Alloys of copper with aluminium (about 7%) have a pleasant golden color and are used in decorations. Some lead-free solders consist of tin alloyed with a small proportion of copper and other metals. Balver Zinn Solder Sn97Cu3. (PDF) . balverzinn.com. Retrieved on 2011-11-08.

Compounds
Copper forms a rich variety of compounds, usually with 1 and 2, which are often called cuprous and cupric, respectively.

Binary compounds
As with other elements, the simplest compounds of copper are binary compounds, i.e. those containing only two elements. The principal ones are the oxides, sulfides, and . Both and are known. Among the numerous , important examples include and .

The cuprous halides with , , and are known, as are the cupric halides with , , and . Attempts to prepare copper(II) iodide give cuprous iodide and iodine. ξ8

2 Cu2 4 I− → 2 CuI I2

Coordination chemistry
Copper, like all metals, forms with . In aqueous solution, copper(II) exists as Cu(H2O)62 . This complex exhibits the fastest water exchange rate (speed of water ligands attaching and detaching) for any transition . Adding aqueous causes the precipitation of light blue solid . A simplified equation is:
Cu2 2 OH− → Cu(OH)2
results in the same precipitate. Upon adding excess ammonia, the precipitate dissolves, forming :
Cu(H2O)4(OH)2 4 NH3 → Cu(H2O)2(NH3)42 2 H2O 2 OH−
Many other form complexes; these include , , and . forms a blue crystalline penta, which is the most familiar copper compound in the laboratory. It is used in a called the . ξ9

, compounds containing more than one alcohol , generally interact with cupric salts. For example, copper salts are used to test for . Specifically, using and the presence of the sugar is signaled by a color change from blue Cu(II) to reddish copper(I) oxide.Ralph L. Shriner, Christine K. F. Hermann, Terence C. Morrill, David Y. Curtin, Reynold C. Fuson "The Systematic Identification of Organic Compounds" 8th edition, J. Wiley, Hoboken. ISBN 0-471-21503-1 Schweizer's reagent and related complexes with and other dissolve cellulose.Kay Saalwächter, Walther Burchard, Peter Klüfers, G. Kettenbach, and Peter Mayer, Dieter Klemm, Saran Dugarmaa "Cellulose Solutions in Water Containing Metal Complexes" Macromolecules 2000, 33, 4094–4107. form very stable chelate complexes with copper(II). Many wet-chemical tests for copper ions exist, one involving , which gives a brown precipitate with copper(II) salts.

Organocopper chemistry
Compounds that contain a carbon-copper bond are known as organocopper compounds. They are very reactive towards oxygen to form copper(I) oxide and have . They are synthesized by treating copper(I) compounds with , terminal or ;"Modern Organocopper Chemistry" Norbert Krause, Ed., Wiley-VCH, Weinheim, 2002. ISBN 978-3-527-29773-3. in particular, the last reaction described produces a . These can undergo with to form ; as such, they are important in the field of . is highly shock-sensitive but is an intermediate in reactions such as the and the . to and of alkynes can also be achieved with organocopper compounds. Copper(I) forms a variety of weak complexes with and , especially in the presence of amine ligands.

Copper(III) and copper(IV)
Copper(III) is most characteristically found in oxides. A simple example is potassium , KCuO2, a blue-black solid. The best studied copper(III) compounds are the . (YBa2Cu3O7) consists of both Cu(II) and Cu(III) centres. Like oxide, fluoride is a highly basic anion and is known to stabilize metal ions in high oxidation states. Indeed, both copper(III) and even copper(IV) fluorides are known, and , respectively.

Some copper proteins form , which also feature copper(III). With di- and tri, purple-colored copper(III) complexes are stabilized by the deprotonated ligands.

Complexes of copper(III) are also observed as intermediates in reactions of organocopper compounds.

History
Copper Age
Copper occurs naturally as native copper and was known to some of the oldest civilizations on record. It has a history of use that is at least 10,000 years old, and estimates of its discovery place it at 9000 BC in the Middle East; a copper pendant was found in northern Iraq that dates to 8700 BC. ξ10 There is evidence that gold and (but not iron smelting) were the only metals used by humans before copper. The history of copper metallurgy is thought to have followed the following sequence: 1) of , 2) , 3) , and 4) the . In southeastern Anatolia, all four of these metallurgical techniques appears more or less simultaneously at the beginning of the Neolithic c. 7500 BC. ξ11 However, just as agriculture was independently invented in several parts of the world (including Pakistan, China, and the Americas) copper smelting was invented locally in several different places. It was probably discovered independently in China before 2800 BC, in Central America perhaps around 600 AD, and in West Africa about the 9th or 10th century AD. was invented in 4500–4000 BC in Southeast Asia and has established mining at in , UK at 2280 to 1890 BC. , a male dated from 3300–3200 BC, was found with an axe with a copper head 99.7% pure; high levels of in his hair suggest his involvement in copper smelting. Experience with copper has assisted the development of other metals; in particular, copper smelting led to the discovery of . Production in the in and is dated between 6000 and 3000 BC.Pleger, Thomas C. "A Brief Introduction to the Old Copper Complex of the Western Great Lakes: 4000–1000 BC", Proceedings of the Twenty-seventh Annual Meeting of the Forest History Association of Wisconsin, Oconto, Wisconsin, October 5, 2002, pp. 10–18.Emerson, Thomas E. and McElrath, Dale L. Archaic Societies: Diversity and Complexity Across the Midcontinent, SUNY Press, 2009 ISBN 1-4384-2701-8. Natural bronze, a type of copper made from ores rich in silicon, arsenic, and (rarely) tin, came into general use in the Balkans around 5500 BC.

Bronze Age
Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use. Bronze artifacts from cities and artifacts of copper and bronze alloys date to 3000 BC. ξ12 The began in Southeastern Europe around 3700–3300 BC, in Northwestern Europe about 2500 BC. It ended with the beginning of the Iron Age, 2000–1000 BC in the Near East, 600 BC in Northern Europe. The transition between the period and the Bronze Age was formerly termed the period (copper-stone), with copper tools being used with stone tools. This term has gradually fallen out of favor because in some parts of the world the Chalcolithic and Neolithic are coterminous at both ends. Brass, an alloy of copper and zinc, is of much more recent origin. It was known to the Greeks, but became a significant supplement to bronze during the Roman Empire.

Antiquity and Middle Ages
In Greece, copper was known by the name chalkos (χαλκός). It was an important resource for the Romans, Greeks and other ancient peoples. In Roman times, it was known as aes Cyprium, aes being the generic Latin term for copper alloys and Cyprium from , where much copper was mined. The phrase was simplified to cuprum, hence the English copper. and represented copper in mythology and alchemy, because of its lustrous beauty, its ancient use in producing mirrors, and its association with Cyprus, which was sacred to the goddess. The seven heavenly bodies known to the ancients were associated with the seven metals known in antiquity, and Venus was assigned to copper.

Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South America, particularly in Peru around 1000 AD; it proceeded at a much slower rate on other continents. Copper burial ornamentals from the 15th century have been uncovered, but the metal's commercial production did not start until the early 20th century.

The cultural role of copper has been important, particularly in currency. Romans in the 6th through 3rd centuries BC used copper lumps as money. At first, the copper itself was valued, but gradually the shape and look of the copper became more important. had his own coins made from brass, while 's coins were made from Cu-Pb-Sn alloys. With an estimated annual output of around 15,000 t, reached a scale unsurpassed until the time of the ; the most intensely mined were those of , and in Central Europe.

The gates of the used made by depletion gilding. It was most prevalent in Alexandria, where alchemy is thought to have begun. In ancient India, copper was used in the holistic medical science for surgical instruments and other medical equipment. Ancient Egyptians (~2400 BC) used copper for sterilizing wounds and drinking water, and later on for headaches, burns, and itching. The , with copper cylinders soldered to lead, dates back to 248 BC to AD 226 and resembles a galvanic cell, leading people to believe this was the first battery; the claim has not been verified.

Modern period
The was a mine in Falun, Sweden, that operated from the 10th century to 1992. It produced two thirds of Europe's copper demand in the 17th century and helped fund many of Sweden's wars during that time. ξ13 It was referred to as the nation's treasury; Sweden had a .

The uses of copper in art were not limited to currency: it was used by sculptors, in photographic technology known as the , and the . and for ships' hulls was widespread; the ships of Christopher Columbus were among the earliest to have this feature. The in Hamburg was the first modern plant starting its production in 1876. The German scientist invented in 1830 while determining the metal's atomic mass; around then it was discovered that the amount and type of alloying element (e.g., tin) to copper would affect bell tones. was developed by in Finland and first applied at in 1949; the energy-efficient process accounts for 50% of the world’s primary copper production.

The , formed in 1967 with Chile, Peru, Zaire and Zambia, played a similar role for copper as does for oil. It never achieved the same influence, particularly because the second-largest producer, the United States, was never a member; it was dissolved in 1988.

Applications
The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an (5% of total use) such as and . A small part of copper supply is used in production of compounds for nutritional supplements and fungicides in agriculture. of copper is possible, although it is usually necessary to use an alloy for intricate parts to get good machinability characteristics.

Wire and cable
Despite competition from other materials, copper remains the preferred in nearly all categories of electrical wiring with the major exception being overhead where is often preferred.Pops, Horace, 2008, Processing of wire from antiquity to the future, Wire Journal International, June, pp 58–66The Metallurgy of Copper Wire, http://www.litz-wire.com/pdf files/Metallurgy_Copper_Wire.pdf Copper wire is used in , , , , circuitry, and countless types of .Joseph, Günter, 1999, Copper: Its Trade, Manufacture, Use, and Environmental Status, edited by Kundig, Konrad J.A., ASM International, pps. 141–192 and pps. 331–375. is the most important market for the copper industry. This includes building wire, communications cable, power distribution cable, appliance wire, automotive wire and cable, and magnet wire. Roughly half of all copper mined is used to manufacture electrical wire and cable conductors.Joseph, Günter, 1999, Copper: Its Trade, Manufacture, Use, and Environmental Status, edited by Kundig, Konrad J.A., ASM International, p.348 Many electrical devices rely on copper wiring because of its multitude of inherent beneficial properties, such as its high , , , resistance, resistance, low , high , , and ease of installation.

Electronics and related devices
and increasingly feature copper in place of aluminium because of its superior electrical conductivity (see for main article); and use copper as a result of its superior heat dissipation capacity to aluminium. , , , and in microwave ovens use copper, as do for microwave radiation.

Electric motors
Copper’s greater versus other metals enhances the electrical energy efficiency of .IE3 energy-saving motors, Engineer Live, http://www.engineerlive.com/Design-Engineer/Motors_and_Drives/IE3_energy-saving_motors/22687/ This is important because motors and motor-driven systems account for 43%-46% of all global electricity consumption and 69% of all electricity used by industry.Energy‐efficiency policy opportunities for electric motor‐driven systems, International Energy Agency, 2011 Working Paper in the Energy Efficiency Series, by Paul Waide and Conrad U. Brunner, OECD/IEA 2011 Increasing the mass and cross section of copper in a increases the electrical energy efficiency of the motor. , a new technology designed for motor applications where energy savings are prime design objectives,Fuchsloch, J. and E.F. Brush, (2007), “Systematic Design Approach for a New Series of Ultra‐NEMA Premium Copper Rotor Motors”, in EEMODS 2007 Conference Proceedings, 10‐15 June,Beijing.Copper motor rotor project; Copper Development Association; http://www.copper.org/applications/electrical/motor-rotor are enabling general-purpose to meet and exceed (NEMA) standards.NEMA Premium Motors, The Association of Electrical Equipment and Medical Imaging Manufacturers; http://www.nema.org/gov/energy/efficiency/premium/

Architecture
Copper has been used since ancient times as a durable, , and weatherproof architectural material.Seale, Wayne (2007). The role of copper, brass, and bronze in architecture and design; Metal Architecture, May 2007Copper roofing in detail; Copper in Architecture; Copper Development Association, U.K., www.cda.org.uk/archArchitecture, European Copper Institute; http://eurocopper.org/copper/copper-architecture.htmlKronborg completed; Agency for Palaces and Cultural Properties, København, http://www.slke.dk/en/slotteoghaver/slotte/kronborg/kronborgshistorie/kronborgfaerdigbygget.aspx?highlight=copper , , , , , , vaults, and have been made from copper for hundreds or thousands of years. Copper’s architectural use has been expanded in modern times to include interior and exterior , building , , and indoor products, such as attractive handrails, bathroom fixtures, and counter tops. Some of copper’s other important benefits as an architectural material include its low , light weight, , and its recyclability.

The metal’s distinctive natural green has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering.Architectural considerations; Copper in Architecture Design Handbook, http://www.copper.org/applications/architecture/arch_dhb/fundamentals/arch_considerations.htmPeters, Larry E. (2004). Preventing corrosion on copper roofing systems; Professional Roofing, October 2004, http://www.professionalroofing.net It can be a mixture of carbonate and sulfate compounds in various amounts, depending upon environmental conditions such as sulfur-containing acid rain.Oxidation Reaction: Why is the Statue of Liberty Blue-Green? Engage Students in Engineering; www.EngageEngineering.org; Chun Wu, Ph.D., Mount Marty College; Funded by the National Science Foundation (NSF) under Grant No. 083306. http://www.wepanknowledgecenter.org/c/document_library/get_file?folderId=517&name=DLFE-2454.pdfYahoo! Answers – What is the patina of an oxidised copper coin made of? http://sg.answers.yahoo.com/question/index?qid=20090726064632AAiDf2kApplication Areas: Architecture – Finishes – patina; http://www.copper.org/applications/architecture/finishes.htmlGlossary of copper terms, Copper Development Association (UK): http://www.copperinfo.co.uk/resources/glossary.shtml Architectural copper and its alloys can also be to embark a particular look, feel, and/or color. Finishes include mechanical surface treatments, chemical coloring, and coatings.Finishes – natural weathering; Copper in Architecture Design Handbook, Copper Development Association Inc., http://www.copper.org/applications/architecture/arch_dhb/finishes/finishes.html

Copper has excellent and properties and can be ; the best results are obtained with . ξ14

Antibiofouling applications
Copper is , meaning bacteria will not grow on it. For this reason it has long been used to line parts of ships to protect against and . It was originally used pure, but has since been superseded by . Similarly, as discussed in , copper alloys have become important netting materials in the industry because of the fact that they are and prevent , even in extreme conditionsEdding, Mario E., Flores, Hector, and Miranda, Claudio, (1995), Experimental Usage of Copper-Nickel Alloy Mesh in Mariculture. Part 1: Feasibility of usage in a temperate zone; Part 2: Demonstration of usage in a cold zone; Final report to the International Copper Association Ltd. and have strong structural and Corrosion Behaviour of Copper Alloys used in Marine Aquaculture. (PDF) . copper.org. Retrieved on 2011-11-08. properties in marine environments.

Antimicrobial applications
Numerous antimicrobial efficacy studies have been conducted in the past 10 years regarding copper’s efficacy to destroy a wide range of bacteria, as well as , , and .

have natural intrinsic properties to destroy a wide range of (e.g., O157:H7, -resistant (), , , , , and ). Copper Touch Surfaces. Copper Touch Surfaces. Retrieved on 2011-11-08. Some 355 copper alloys were proven to kill more than 99.9% of disease-causing bacteria within just two hours when cleaned regularly. EPA registers copper-containing alloy products, May 2008 The (EPA) has approved the registrations of these copper alloys as “ materials with public health benefits," which allows manufacturers to legally make claims as to the positive public health benefits of products made with registered antimicrobial copper alloys. In addition, the EPA has approved a long list of antimicrobial copper products made from these alloys, such as bedrails, , over-bed tables, , , , hardware, , equipment, handles, etc. (for a comprehensive list of products, see: ). Copper doorknobs are used by hospitals to reduce the transfer of disease, and is suppressed by copper tubing in plumbing systems. Antimicrobial copper alloy products are now being installed in healthcare facilities in the U.K., Ireland, Japan, Korea, France, Denmark, and Brazil and in the subway transit system in Santiago, Chile, where copper-zinc alloy handrails will be installed in some 30 stations between 2011–2014. Chilean subway protected with Antimicrobial Copper – Rail News from. rail.co. Retrieved on 2011-11-08. Codelco to provide antimicrobial copper for new metro lines (Chile). Construpages.com.ve. Retrieved on 2011-11-08. PR 811 Chilean Subway Installs Antimicrobial Copper. (PDF). antimicrobialcopper.com. Retrieved on 2011-11-08.

Folk medicine
Copper is commonly used in jewelry, and folklore says that copper bracelets relieve symptoms. In , some proponents speculate that excess copper absorbed through the skin can treat some ailments, or that the copper somehow creates a magnetic field, treating nearby tissue.

In various studies, though, no difference is found between arthritis treated with a copper bracelet, magnetic bracelet, or placebo bracelet. The Daily Mail:
Copper bracelet arthritis cure is a myth, say scientists National Institutes of Health ( NIH):


No difference was observed between devices in terms of their effects on pain as measured by the primary outcome measure (WOMAC A), the PRI and the VAS. Similar results were obtained for stiffness (WOMAC B), physical function (WOMAC C), and medication use. Further analyses of the PRI subscales revealed a statistically significant difference between devices (P=0.025), which favoured the experimental device. Participants reported lower sensory pain after wearing the standard magnetic wrist strap, than when wearing control devices. However, no adjustment was made for multiple testing. As far as medical science is concerned, wearing copper has no known benefit, for any medical condition at all. A human being can have a dietary copper deficiency, but this is very rare, because copper is present in many common foods, including (beans), grains, and . University of Arkansas for Medical Sciences:
Can wearing a copper bracelet cure arthritis?

According to the Center for Hand and Upper Extremity Surgery at UAMS, copper deficiency is extremely rare and most regular diets provide enough copper to meet the daily requirements. Copper is a component of some of the normal cellular enzymes in most mineral rich foods, such as vegetables, potatoes, legumes (beans and peas), nuts (peanuts and pecans), grains (wheat and rye) and fruits. Supplementation is only needed in patients with serious medical conditions that affect their gastrointestinal tract and impair their ability to absorb nutrients.

There is no evidence that copper even can be absorbed through the skin. But if it were, this could actually lead to copper poisoning, which may actually be more likely than beneficial effects. University of Arkansas for Medical Sciences:
Find the Truth Behind Medical Myths

While it’s never been proven that copper can copper be absorbed through the skin by wearing a bracelet, research has shown that excessive copper can result in poisoning, causing vomiting and, in severe cases, liver damage.

More recently, some clothing has been sold with copper woven into it, with the same folk medicine claims being made. While compression clothing is a real treatment for some ailments, therefore the clothing may appear to work, the added copper may very well have no benefit beyond a . Truth in Advertising
Tommie Copper

So it seems possible that copper-infused compression clothing could help you recover from a tough workout, and it’s also possible it could have some anti-bacterial properties in clothes. But as for the claims in the infomercial about relieving joint pain and helping with everyday aches — any relief from copper-compression seems more likely to be a placebo effect than anything else. Think carefully before shelling out for Tommie Copper.

Other uses
Copper compounds in liquid form are used as a wood preservative, particularly in treating original portion of structures during restoration of damage due to . Together with zinc, copper wires may be placed over non-conductive roofing materials to discourage the growth of moss. Textile fibers use copper to create antimicrobial protective fabrics, Ergowear, Copper antimicrobial yarn technology used in male underwear as do , and . Electroplating commonly uses copper as a base for other metals such as nickel.

Copper is one of three metals, along with lead and silver, used in a museum materials testing procedure called the . In this procedure, copper is used to detect chlorides, oxides, and sulfur compounds.

Copper is used as the printing plate in , and other forms of .

Copper oxide and carbonate is used in and in to impart green and brown colors.

Copper is the principal alloying metal in some and alloys. It may also be used on its own, or as a constituent of brass, bronze, and many other .

Degradation
and can both mobilize solid copper, as a cyanide compound. The Ericoid Mycorrhizal Fungi Calluna, Erica and Vaccinium can grow in copper metalliferous soils. The ectomycorrhizal fungi Suillus luteus protects young pine trees from copper toxicity. A sample of the fungus was found growing from gold mining solution; and was found to contain cyano metal complexes; such as gold, silver, copper iron and zinc. The fungus also plays a role in the solubilization of heavy metal sulfides.

Biological role
have diverse roles in biological electron transport and oxygen transportation, processes that exploit the easy interconversion of Cu(I) and Cu(II). ξ15 electronic-book ISBN 978-94-007-5561-1 electronic- ξ15 electronic-book ISBN 978-94-007-5561-1 electronic- S. J. Lippard, J. M. Berg "Principles of bioinorganic chemistry" University Science Books: Mill Valley, CA; 1994. ISBN 0-935702-73-3. The biological role for copper commenced with the appearance of oxygen in earth's atmosphere. The protein is the oxygen carrier in most and some such as the ( Limulus polyphemus). Because hemocyanin is blue, these organisms have blue blood, not the red blood found in organisms that rely on for this purpose. Structurally related to hemocyanin are the and . Instead of reversibly binding oxygen, these proteins hydroxylate substrates, illustrated by their role in the formation of .

Copper is also a component of other proteins associated with the processing of oxygen. In , which is required for aerobic , copper and iron cooperate in the reduction of oxygen. Copper is also found in many , proteins that catalyze the decomposition of , by converting it (by ) to oxygen and :

2 HO2 → H2O2 O2

Several copper proteins, such as the "blue copper proteins", do not interact directly with substrates, hence they are not enzymes. These proteins relay electrons by the process called .

Dietary needs
Copper is an essential in plants and animals, but not some microorganisms. The human body contains copper at a level of about 1.4 to 2.1 mg per kg of body mass. Stated differently, the for copper in normal healthy adults is quoted as 0.97 mg/day and as 3.0 mg/day. Copper is absorbed in the gut, then transported to the liver bound to . After processing in the liver, copper is distributed to other tissues in a second phase. Copper transport here involves the protein , which carries the majority of copper in blood. Ceruloplasmin also carries copper that is excreted in milk, and is particularly well-absorbed as a copper source. Copper in the body normally undergoes (about 5 mg a day, vs. about 1 mg per day absorbed in the diet and excreted from the body), and the body is able to excrete some excess copper, if needed, via , which carries some copper out of the liver that is not then reabsorbed by the intestine.

Copper-based disorders
Because of its role in facilitating iron uptake, can produce -like symptoms, , bone abnormalities, hypopigmentation, impaired growth, increased incidence of infections, osteoporosis, hyperthyroidism, and abnormalities in glucose and cholesterol metabolism. Conversely, causes an accumulation of copper in body tissues.

Severe deficiency can be found by testing for low plasma or serum copper levels, low ceruloplasmin, and low red blood cell superoxide dismutase levels; these are not sensitive to marginal copper status. The "cytochrome c oxidase activity of leucocytes and platelets" has been stated as another factor in deficiency, but the results have not been confirmed by replication.

Fire diamond for copper metal

Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of that damage . Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for healthy growth in rabbits has been reported to be at least 3 in the diet. However, higher concentrations of copper (100 ppm, 200 ppm, or 500 ppm) in the diet of rabbits may favorably influence , growth rates, and carcass dressing percentages.

Chronic copper toxicity does not normally occur in humans because of transport systems that regulate absorption and excretion. Autosomal recessive mutations in copper transport proteins can disable these systems, leading to with copper accumulation and of the liver in persons who have inherited two defective genes.

See also

Notes
for copper
in pure water, or acidic or alkali conditions. Copper in neutral water is more noble than hydrogen.in water containing sulfidein 10 M ammonia solutionin a chloride solution

Further reading

External links 


     

     

     
 

 References
     
     

     
    ^  (2024). 9780072921946, McGraw-Hill Professional. 
    ^  (2024). 9780849304859, CRC press. 
    ^  (2024). 9780962438202, Resistance Welding Manufacturing Alliance. 
    ^  (1884). 9780665469121, W. & R. Chambers. . 
    ^  (1992). 9783527281268, VCH Publishers. . 
    ^  (2003). 9780198503408, Oxford University Press. . 
    ^  (2024). 9780393328318, New York: W.W. Norton. 
    ^  (2024). 9780123526519, Academic Press. 
    ^  (2007). 9783527316045 . 
    ^  (2024). 9780313335075, Greenwood Publishing Group. 
    ^  (1990). 9780140136425, Penguin. . 
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    ^  (2004). 9781861891730 . 
    ^  (2024). 9780871707260, ASM International. 
    ^  (2024). 9789400755604, Springer. 
    ^  (2024). 9780896039438, Humana Press. 
    ^  (2024). 9780471736967, Wiley, New York. 

     
     
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