Paper: An Analysis of the Chromium Element and the 18th Century

Today the element chromium must be separated from its compounds to get it, because it is not found freely in nature. Chromium is a metal that is used in many processes. It is used to form alloys with other metals. Chromium is used to harden steel, and to manufacture stainless steel. It is used in plating to produce a hard, beautiful surface and to prevent corrosion, which most people call chrome. Chrome is mainly used on car trim among other things. Chromium is what gives emeralds their green color, and rubies their red color, so it is used to give glass these colors. It is widely used as a catalyst. Dichromates are oxidizing agents and are used in analysis and in tanning leather. Chromium compounds are used in the textile industry as mordant. It is also used to anodize aluminum by the aircraft and other industry. The Chromium compound chromite is used in the refractory industry for forming bricks and shapes, because of its high melting point, moderate thermal expansion, and ! stable crystalline structure. We as humans also have chromium in our bodies in small trace amounts. It has a role in glucose metabolism and seems to have an effect in the action of insulin. Chromium compounds should be seen as a highly toxic in anything other than trace amounts. Chromium metal powder is a fire hazard and the Chromium VI compounds are highly toxic and carcinogenic. Chromium III compounds are not as toxic as others. Chromium compounds are important pollutants. It is also highly reactive with NH4NO3, N202, Li, NO, KCIO3, SO2. Chromium is only found in compounds in nature. The most important, chromite (FeCr204), is found in Turkey, USA, South Africa, Albania, Finland, Iran, Madagascar, Russia, Rhodesia, Transvaal, Cuba, Brazil, Japan, India, Pakistan, and the Philippines. Chromium is also found in another compound called crocoite (PbCrO4), which is found in Russia, Brazil, USA, and Tasmania....