![Lenntech <!-- PLUGIN:LANGUAGE:water_treatment_and_purification -->](https://web.archive.org/web/20160120202631im_/http://www.lenntech.com/images/design/Lenntech_logo_blue.jpg)
Chromium - Cr
Chemical properties of chromium - Health effects of chromium - Environmental effects of chromium
| |
ChromiumChromium is a lustrous, brittle, hard metal. Its colour is silver-gray and it can be highly polished. It does not tarnish in air, when heated it borns and forms the green chromic oxide. Chromium is unstable in oxygen, it immediately produces a thin oxide layer that is impermeable to oxygen and protects the metal below. ApplicationsChromium main uses are in alloys such as stainless steel, in chrome plating and in metal ceramics. Chromium plating was once widely used to give steel a polished silvery mirror coating. Chromium is used in metallurgy to impart corrosion resistance and a shiny finish; as dyes and paints, its salts colour glass an emerald green and it is used to produce synthetic rubies; as a catalyst in dyeing and in the tanning of leather; to make molds for the firing of bricks. Chromium (IV) oxide (CrO2) is used to manufacture magnetic tape. Chromium in the environment Chromium is mined as chromite (FeCr2O4) ore. Chromium ores are mined today in South Africa, Zimbabwe, Finland, India, Kazakihstan and the Philippines. A total of 14 million tonnes of chromite ore is extracted. Reserves are hestimated to be of the order of 1 billion tonnes with unexploited deposits in Greenland, Canada e USA. Health effects of chromium
|
There are several different kinds of chromium that differ in their effects upon organisms. Chromium enters the air, water and soil in the chromium(III) and chromium(VI) form through natural processes and human activities. |
Read more on chromium in water
Back to the periodic table of elements.
About Lenntech
Lenntech BV
Rotterdamseweg 402 M
2629 HH Delft
tel: +31 152 610 900
fax: +31 152 616 289
e-mail: info@lenntech.com
Copyright © 1998-2016 Lenntech B.V. All rights reserved