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Platinum is the second most common of the platinum group metals (PGM) after palladium. Thanks to it's chemical resistance, even at high temperatures, it has found a wide variety of technological uses, for example as catalysts, in lab ware, as anodes or on turbine blades. It is a silverish-white ductile metal with a melting point of 1768.3 °C (3214.9 °F). The name platinum comes from the Spanish "platina", meaning "little silver".
(Short description of refining platinum)
Testing of platinum is made by ICP-MS difference and in accordance to an ISO/ASTM standard.
Ref : Posting by Lou
Platinum in it self is very inert and can be used for the casing of implanted devices as pace makers. In it's solution form as tetravalent platinum it can give rise to platinum allergy.
Platinum dissolved in aqua regia.
Pt + 4HNO3 + 6HCl -> H2PtCl6 + 4 NO2 + 4H2O
Platinum dissolved in hydrochloric acid and chlorine.
Pt + 2Cl2 + 2HCl -> H2PtCl6
In both cases the end product is hexachloroplatinic acid.
Platinum has one interesting quirk, when it is alloyed with silver it can actually be dissolved in nitric acid only. This fact can be used to remove platinum from gold alloys by inquarting. The platinum follows the silver as a nitrate salt into solution, leaving a gold sponge that is easy to refine with aqua regia or to melt down directly.
- NurdRage : Dissolving platinum in aqua regia
- NurdRage : Dissolving platinum in hydrochloric acid and chlorine.
- GRF : Separation and Purification Au,Pt,Pd,Ag,Rh,Os,Ir,Ru
- GRF : Discussion about refining platinum, lots of tips
- GRF : Precipitating platinum, also contains a description of bromate hydrolysis
- GRF : Precipitating Pt with KCl
- GRF : Precipitating platinum sponge with hydrazine sulfate + tips from Lou
- GRF : Platinum with iridium
- GRF : Melting and casting
- Wikipedia : Platinum
- Science Madness : Refining of palladium and platinum
- Recovery of Platinum from Laboratory Residues, G.B. Kauffman, L.A. Teter and R.N. Rhoda, Inorganic Syntheses 7, 232-236 (1931)