Suchen Sie nach Platinum Symbol-Stockbildern in HD und Millionen weiteren lizenzfreien Stockfotos, Illustrationen und Vektorgrafiken in der. Finden Sie perfekte Stock-Fotos zum Thema Platinum Symbol sowie redaktionelle Newsbilder von Getty Images. Wählen Sie aus erstklassigen Inhalten. No higher resolution available. nantyrarian.com ( × pixels, file size: 4 KB, MIME type: image/png). File information. Structured data.
prism online casinoNo higher resolution available. nantyrarian.com ( × pixels, file size: 4 KB, MIME type: image/png). File information. Structured data. Finden Sie perfekte Stock-Fotos zum Thema Platinum Symbol sowie redaktionelle Newsbilder von Getty Images. Wählen Sie aus erstklassigen Inhalten. Platin ist ein chemisches Element im Periodensystem der Elemente mit dem Symbol Pt und der Ordnungszahl Platin ist ein schweres, schmiedbares.
Platinum Symbol Hallmarks and Maker's Marks VideoBlue Nile - Jewelry Education, Platinum
Platinum Symbol Platinum Symbol. - DateiversionenAllerdings werden Platinkatalysatoren schnell durch Alterung und Verunreinigungen inaktiv vergiftet. You are free: to share — to copy, distribute and transmit the work to remix — to adapt the work Under the following conditions: attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. Merkur Spielcasino Möglichkeit ist das flammenfreie elektrisch-induktive Riszk des Schmelzgutes in Zirkonoxidkeramiken. Die nachfolgenden anderen Wikis verwenden diese Datei: Verwendung auf he.
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.
If you can't read the markings on your jewelry, or there aren't any, read the article for tips on testing jewelry with an acid testing kit, a silver testing solution, or hydrogen peroxide.
Did this summary help you? Yes No. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker.
Cookie Settings. Learn why people trust wikiHow. Explore this Article methods. Tips and Warnings. Related Articles. Article Summary.
Method 1 of Locate any identifying marks on your jewelry. These markings will be etched into the metal. If the jewelry has a clasp then the marks are probably on the back of the clasp.
The jewelry might also have a small metal tag etched with marks hanging from the end. Lastly, search the largest parts of the jewelry.
If your jewelry doesn't have any markings at all it's probably not a precious metal. Look for marks indicating silver jewelry. Sterling silver is Pure silver jewelry is rare as pure silver is soft and easily damaged.
Find any marks indicating platinum jewelry. Platinum is a very rare and expensive metal. Therefore, all platinum jewelry will be marked to show authenticity.
Run a magnet over the jewelry. Most pure precious metals aren't magnetic, so if you place a magnet near the jewelry, you shouldn't see any movement.
Cancel Report. Create a new account. Log In. Powered by CITE. We need you! Are we missing an important symbol in this category?
Hear from active traders about their experience adding CME Group futures and options on futures to their portfolio. Find a broker. Understand how the bond market moved back to its normal trading range, despite historic levels of volatility.
Market Data Home. Real-time market data. Hallmarks, also known as quality or purity marks, guarantee the purity or quality of a precious metal.
They are expressed with numbers, symbols, letters or a combination thereof stamped, impressed or struck on platinum to indicate its fineness, according to Modern Silver Magazine.
English and French jewelry makers have used hallmarks since the 14th century, but American makers have never used them on platinum per se.
French jewelry makers utilized the eagle head and dog head hallmarks for platinum after , when they formally recognized it as a precious metal.
The symbol consists of a crescent moon shape, inverted to face left. This shape is connected to an equally-sized unfilled circle, itself containing a significantly smaller circle.
Platinum was thought, amongst alchemists, to be the combination of silver and gold. The symbol incorporates the signs of the sun and moon, associated with these metals.