US3896209A

Under acidic conditions the hexavalent chromium present in aqueous solutions is chemically reduced to trivalent chromium with hydrogen peroxide This process is improved if the pH of the aqueous solution is maintained below 15 and the hydrogen peroxide is gradually added to the solution to keep the chromate in excess as long as possible...

CHROMIUM, HEXAVALENT, 7703 by Field

SPECIAL PRECAUTIONS: Hexavalent chromium is a human respiratory carcinogen [10] Efforts Efforts must be made to prevent aerosolizing chromate-containing compounds and solutions...

Hexavalent Chromium Testing

Reduction of chromium-6 to chromium-3, followed by removal of chromium-3 A bench-scale study sponsored by the American Water Works Association-Water Research Foundation identified four technologies which are most promising for application by drinking water systems...

Hexavalent Chromium Reduction with Zero

Hexavalent chromium is a heavy metal used in a variety of industrial applications which is highly toxic to humans, animals, plants and microorganisms Moreover, it is a well-established human carcinogen by the inhalation route of exposure and a possible human carcinogen by the oral route of exposure ....

The reduction of hexavalent chromium by sulphite in ,

The reduction of hexavalent chromium, Cr(VI), in unbuffered aqueous solution by sulphite was investigated as a function of pH, possible dosage and contact time ,...

National Emphasis Program

hexavalent chromium and may be released into the work environment from the same materials and in the same manner as hexavalent chromium The intent of this NEP is to target workplaces with occupational exposures to hexavalent chromium and the ,...

Hexavalent Chromium and Compounds

chromium at the site of contact, the mechanisms of chromium toxicity appear very complex and are mediated partly: (1) through reactive intermediates during intracellular reduction of CrVI to CrIII and oxidative reactions, and (2) by CrIII which is the final product of intracellular CrVI...

Hexavalent chromium

Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent) Virtually all chromium ore is processed via hexavalent chromium, specifically the salt sodium dichromate...

Hexavalent Chromium Fact Sheet

Hexavalent Chromium Fact Sheet Hexavalent chromium compounds are a toxic form of chromium and are used in a variety of industrial processes and products The hazards of hexavalent chromium compounds are significantly different from those of non-hexavalent chromium compounds...

The Use of α

use of tartaric acid and isopropyl alcohol in the reduction of hexavalent chromium and application to chromium contaminated soils and chromite ore processing residue...

Introduction

The most common hexavalent chromium-bearing solutions include decorative and hard chromium, aluminum conversion coating, bright dipping of copper and copper alloys, chromic acid anodizing, and chromate conversion coatings on cadmium, zinc, silver and copper...

Hexavalent chromium risk reduction strategy

The environmental risk reduction strategy for the use of hexavalent chromium...

CHROME WASTE WASTEREATMENT

CHROME WASTE WASTEREATMENT HEXAVALENT CHROME WASTE TREATMENT , achieved by reducing hexavalent chromium to trivalent chromium with precipitation to chromium hydroxide a , pH Control to Promote Chromium Reduction This reaction will progress rapidly between 2 and 3 pH Therefore, facilities performing chrome waste...