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Reference.org
Hexavalent chromium
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<p>Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> that contains the element <a href="/facts/Chromium/6sVk6Uu7">chromium</a> in the +6 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> (thus <a href="/facts/Valence_(chemistry)/ck7cHByj">hexavalent</a>). It has been identified as carcinogenic, which is of concern since approximately 136,000 tonnes (150,000 tons) of hexavalent chromium were produced in 1985. Hexavalent chromium compounds can be <a href="/facts/Carcinogens/soH8Y9CE">carcinogens</a> (<a href="/facts/IARC_Group_1/EY8MuDwQ">IARC Group 1</a>), especially if airborne and inhaled where they can cause <a href="/facts/Lung_cancer/LHLdR454">lung cancer</a>. </p>