 A Hexavalent chromium compound: Chromium(VI)-oxide Hexavalent chromium or Cr(VI) compounds are those which contain the element chromium in the +6 oxidation state. Chromates are often used as pigments for photography, and in pyrotechnics, dyes, paints, inks, and plastics. They can also be used for stainless steel production, textile dyes, wood preservation, leather tanning, and as anti-corrosion and conversion coatings. They are used as corrosion inhibitors, but due to their toxicity they are being replaced by alternatives. Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1120 × 840 pixel, file size: 443 KB, MIME type: image/jpeg) Source: German Wikipedia, original upload 26. ...
Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (1120 × 840 pixel, file size: 443 KB, MIME type: image/jpeg) Source: German Wikipedia, original upload 26. ...
General Name, Symbol, Number chromium, Cr, 24 Chemical series transition metals Group, Period, Block 6, 4, d Appearance silvery metallic Standard atomic weight 51. ...
In chemistry, the oxidation state is an indicator of the degree of oxidation of an atom in a chemical compound. ...
A sample of ammonium dichromate Chromates and dichromates are salts of chromic acid and dichromic acid, respectively. ...
Natural Ultramarine pigment in powdered form. ...
Photography [fәtɑgrәfi:],[foʊtɑgrәfi:] is the process of recording pictures by means of capturing light on a light-sensitive medium, such as a film or sensor. ...
The word pyrotechnic (literally meaning fire technology) refers to any chemical explosive device, but especially fireworks. ...
The 630 foot high, stainless-clad (type 304L) Gateway Arch defines St. ...
This page is about making leather. ...
Conversion coatings are coatings for metals where the part surface is converted into the coating with a chemical or electro-chemical process. ...
Corrosion inhibitor - Wikipedia /**/ @import /w/skins-1. ...
Hexavalent chromium is recognized as a human carcinogen via inhalation.[1] Workers in many different occupations are exposed to hexavalent chromium. Occupational exposures occur mainly among workers who: The hazard symbol for carcinogenic chemicals in the Globally Harmonized System. ...
- handle dry chromate-containing pigments
- spray chromate-containing paints and coatings
- operate chrome plating baths
- weld, cut or grind chromium-containing metals such as stainless steel.
Bright chrome is often used as a decorative feature on consumer products such as cars. ...
Toxicity
Hexavalent chromium in contact with skin acts as both sensitizer and irritant. After entering the organism, it gets reduced to trivalent chromium, which then binds to proteins and creates haptens which trigger immune system reaction. Once developed, chrome sensitivity becomes fairly persistent; in such cases, even contact with chromate-dyed textiles or wearing of chromate-tanned leather shoes can cause or exacerbate contact dermatitis. A hapten is a small molecule which can elicit an immune response only when attached to a large carrier such as a protein; the carrier may be one which also does not elicit an immune response by itself. ...
Tanned leather in Marrakech This article or section does not cite any references or sources. ...
Modern leather-working tools Leather is a material created through the tanning of hides and skins of animals, primarily cattlehide. ...
Contact dermatitis is a term for a skin reaction resulting from exposure to allergens or irritants. ...
Hexavalent chromium compounds are carcinogens. Chronic inhalation of such compounds increases risk of lung cancer. Zinc chromate is the strongest carcinogen of the chromates used in industry. Soluble compounds, like chromic acid, are much weaker carcinogens. The hazard symbol for carcinogenic chemicals in the Globally Harmonized System. ...
Lung cancer is the malignant transformation and expansion of lung tissue, and is the most lethal of all cancers worldwide, responsible for 1. ...
Zinc chromate conversion coating on small steel parts. ...
In chemistry, chromic acid is a chromium (Cr) compound, yet to be isolated, with the formula H2CrO4. ...
Hexavalent chromium is genotoxic. It appears that the mechanism of genotoxicity relies on pentavalent or trivalent chromium, an intracellular reduction product of hexavalent chromium after its penetration into the cell. According to some researchers, the damage is caused by hydroxyl radicals, produced during reoxidation of pentavalent chromium by hydrogen peroxide molecules present in the cell. [1] Categories: Move to Wiktionary | Biochemistry stubs ...
Hydroxide is a functional group consisting of oxygen and hydrogen: -O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. ...
Hydrogen peroxide (H2O2) is a very pale blue liquid which appears colourless in a dilute solution, slightly more viscous than water. ...
In an organism, hexavalent chromium undergoes reduction, first to metastable pentavalent chromium, then to trivalent chromium. Pentavalent chromium is a known carcinogen. If the material gets lodged in tissues (lungs are especially vulnerable here, followed by fine capillaries in kidneys and intestines), its long-term action may lead to cancerous growth. In some parts of Russia, pentavalent chromium was reported as one of the factors of incidence of premature senility. [2] The word capillary is used to describe any very narrow tube or channel through which a fluid can pass. ...
Permissible Exposure Limit (PEL or OSHA PEL) The OSHA PEL for airborne exposures to hexavalent chromium is 5 µg/m3 (0.005 mg/m3).[2]
Vitamin C Researchers have recently reported discovering that vitamin C reacts inside human lung cells with chromium 6, causing massive DNA damage. Low doses of chromium 6, combined with vitamin C, produce up to 15 times as many chromosomal breaks and up to 10 times more mutations, compared with cells lacking vitamin C. Outside cells, vitamin C actually protects against the cellular damage caused by hexavalent chromium. [3] For other uses, see Vitamin C (disambiguation). ...
Erin Brockovich Hexavalent chromium is the substance against which Erin Brockovich campaigned. It was found in drinking water in the Southern California town of Hinkley. Erin Brockovich-Ellis (born Erin L. E. Pattee June 22, 1960 in Lawrence, Kansas) is a legal clerk who, despite the lack of a formal law school education, was instrumental in constructing a case against the $28 billion Pacific Gas & Electric Company (PG&E), of California in 1993. ...
Hinkley is a town in the Mojave Desert in California, 10 miles west of Barstow, 45 miles east of Mojave, and 50 miles northeast of Palmdale. ...
References The International Agency for Research on Cancer (IARC, or CIRC in its French acronym) is an intergovernmental agency forming part of the World Health Organisation of the United Nations. ...
Year 2006 (MMVI) was a common year starting on Sunday (link displays full 2006 calendar) of the Gregorian calendar. ...
is the 197th day of the year (198th in leap years) in the Gregorian calendar. ...
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