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Add to watchlist Trade Now. News Mining. Kitco 4d. Newsfile 4d. Market Watch 5d. But its purity—used in the finest jewelry at a ratio of parts per thousand—makes platinum the finest metal available on the market today.
Platinum is the natural choice for milestone jewelry, such as engagement rings and wedding bands, because it holds significant gemstones better than any other precious metal.
Diamonds set in platinum are also enhanced by the natural whiteness of the metal, whose glowing patina gets more beautiful with time. And unlike white gold, which retains its whiteness only by being plated with rhodium, platinum will never need re-plating.
Recognized as an element in the 18th century, scientists soon discovered that this unusual white metal, difficult to melt using traditional methods, was also nearly incorruptible by gases or chemicals making it thoroughly non-corrosive.
Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes.
Because of its scarcity in Earth's crust, only a few hundred tonnes are produced annually, and given its important uses, it is highly valuable and is a major precious metal commodity.
Platinum is one of the least reactive metals. It has remarkable resistance to corrosion , even at high temperatures, and is therefore considered a noble metal.
Consequently, platinum is often found chemically uncombined as native platinum. Because it occurs naturally in the alluvial sands of various rivers, it was first used by pre-Columbian South American natives to produce artifacts.
It was referenced in European writings as early as 16th century, but it was not until Antonio de Ulloa published a report on a new metal of Colombian origin in that it began to be investigated by scientists.
Platinum is used in catalytic converters , laboratory equipment, electrical contacts and electrodes , platinum resistance thermometers , dentistry equipment, and jewelry.
Being a heavy metal , it leads to health problems upon exposure to its salts ; but due to its corrosion resistance, metallic platinum has not been linked to adverse health effects.
Pure platinum is a lustrous, ductile , and malleable , silver-white metal. Platinum is insoluble in hydrochloric and nitric acid , but dissolves in hot aqua regia A mixture of nitric and hydrochloric acids , to form chloroplatinic acid , H 2 PtCl 6.
Its physical characteristics and chemical stability make it useful for industrial applications. As is expected, tetracoordinate platinum II compounds tend to adopt electron square planar geometries.
Although elemental platinum is generally unreactive, it dissolves in hot aqua regia to give aqueous chloroplatinic acid H 2 PtCl 6 : .
As a soft acid , platinum has a great affinity for sulfur, such as on dimethyl sulfoxide DMSO ; numerous DMSO complexes have been reported and care should be taken in the choice of reaction solvent.
In , Gerhard Ertl won the Nobel Prize in Chemistry for determining the detailed molecular mechanisms of the catalytic oxidation of carbon monoxide over platinum catalytic converter.
The most abundant of these is Pt, comprising Of the naturally occurring isotopes, only Pt is unstable, though it decays with a half-life of 6.
Platinum also has 34 synthetic isotopes ranging in atomic mass from to , making the total number of known isotopes Most platinum isotopes decay by some combination of beta decay and alpha decay.
Platinum is an extremely rare metal,  occurring at a concentration of only 0. Platinum is often found chemically uncombined as native platinum and as alloy with the other platinum-group metals and iron mostly.
Most often the native platinum is found in secondary deposits in alluvial deposits. Another large alluvial deposit is in the Ural Mountains , Russia, and it is still mined.
In nickel and copper deposits, platinum-group metals occur as sulfides e. Pt,Pd S , tellurides e. PtBiTe , antimonides PdSb , and arsenides e.
PtAs 2 , and as end alloys with nickel or copper. Platinum arsenide, sperrylite PtAs 2 , is a major source of platinum associated with nickel ores in the Sudbury Basin deposit in Ontario , Canada.
The mine ceased operations in In , chromites were identified in the Bushveld region of South Africa, followed by the discovery of platinum in In the Sudbury Basin, the huge quantities of nickel ore processed make up for the fact platinum is present as only 0.
Smaller reserves can be found in the United States,  for example in the Absaroka Range in Montana. Large platinum deposits are present in the state of Tamil Nadu , India.
Platinum exists in higher abundances on the Moon and in meteorites. Correspondingly, platinum is found in slightly higher abundances at sites of bolide impact on Earth that are associated with resulting post-impact volcanism, and can be mined economically; the Sudbury Basin is one such example.
Hexachloroplatinic acid mentioned above is probably the most important platinum compound, as it serves as the precursor for many other platinum compounds.
By itself, it has various applications in photography, zinc etchings, indelible ink , plating, mirrors, porcelain coloring, and as a catalyst.
Treatment of hexachloroplatinic acid with an ammonium salt, such as ammonium chloride , gives ammonium hexachloroplatinate ,  which is relatively insoluble in ammonium solutions.
Heating this ammonium salt in the presence of hydrogen reduces it to elemental platinum. Potassium hexachloroplatinate is similarly insoluble, and hexachloroplatinic acid has been used in the determination of potassium ions by gravimetry.
When hexachloroplatinic acid is heated, it decomposes through platinum IV chloride and platinum II chloride to elemental platinum, although the reactions do not occur stepwise: .
All three reactions are reversible. Platinum II and platinum IV bromides are known as well. Platinum hexafluoride is a strong oxidizer capable of oxidizing oxygen.
Platinum IV oxide , PtO 2 , also known as ' Adams' catalyst ', is a black powder that is soluble in potassium hydroxide KOH solutions and concentrated acids.
Unlike palladium acetate , platinum II acetate is not commercially available. Where a base is desired, the halides have been used in conjunction with sodium acetate.
Zeise's salt , containing an ethylene ligand, was one of the first organometallic compounds discovered. Dichloro cycloocta-1,5-diene platinum II is a commercially available olefin complex, which contains easily displaceable cod ligands "cod" being an abbreviation of 1,5-cyclooctadiene.
The cod complex and the halides are convenient starting points to platinum chemistry. Cisplatin , or cis -diamminedichloroplatinum II is the first of a series of square planar platinum II -containing chemotherapy drugs.
These compounds are capable of crosslinking DNA , and kill cells by similar pathways to alkylating chemotherapeutic agents.
Archaeologists have discovered traces of platinum in the gold used in ancient Egyptian burials as early as BC. For example, a small box from burial of Shepenupet II was found to be decorated with gold-platinum hieroglyphics.
It is quite possible they did not recognize there was platinum in their gold. The metal was used by pre-Columbian Americans near modern-day Esmeraldas, Ecuador to produce artifacts of a white gold-platinum alloy.
Archeologists usually associate the tradition of platinum-working in South America with the La Tolita Culture circa BC - AD , but precise dates and location is difficult, as most platinum artifacts from the area were bought secondhand through the antiquities trade rather than obtained by direct archeological excavation.
The resulting gold-platinum alloy would then be soft enough to shape with tools. It was often simply thrown away, and there was an official decree forbidding the adulteration of gold with platinum impurities.
Ulloa and Juan found mines with the whitish metal nuggets and took them home to Spain. Antonio de Ulloa returned to Spain and established the first mineralogy lab in Spain and was the first to systematically study platinum, which was in His historical account of the expedition included a description of platinum as being neither separable nor calcinable.
Ulloa also anticipated the discovery of platinum mines. After publishing the report in , Ulloa did not continue to investigate the new metal.
In , he was sent to superintend mercury mining operations in Huancavelica. In , Charles Wood,  a British metallurgist , found various samples of Colombian platinum in Jamaica, which he sent to William Brownrigg for further investigation.
In , after studying the platinum sent to him by Wood, Brownrigg presented a detailed account of the metal to the Royal Society , stating that he had seen no mention of it in any previous accounts of known minerals.
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