Chromium is a naturally occurring element that primarily exists in three states
Chromium-0, Chromium III and Chromium VI (Hexavalent Chromium). Chromium-0 is
metallic and is used in the production of steel. Chromium III readily forms many different
compounds and is an essential human dietary element. However it is Chromium VI that is the
most hazardous form of the element. Hexavalent chromium, Cr(VI), exists in ground water as
10
the relatively mobile and toxic anions HCrO4 -
and CrO-4
2 . The reduced form of chromium,
Cr(III), is a cation that under slightly acidic to alkaline conditions is fairly insoluble, readily
adsorbed, and much less toxic than Cr(VI). Selenium also undergoes important redox
transformations. Selenate (Se(VI)) is more mobile and less toxic than selenite (Se(IV)).
Chromium is a naturally occurring element that primarily exists in three statesChromium-0, Chromium III and Chromium VI (Hexavalent Chromium). Chromium-0 ismetallic and is used in the production of steel. Chromium III readily forms many differentcompounds and is an essential human dietary element. However it is Chromium VI that is themost hazardous form of the element. Hexavalent chromium, Cr(VI), exists in ground water as 10the relatively mobile and toxic anions HCrO4 -and CrO-42 . The reduced form of chromium,Cr(III), is a cation that under slightly acidic to alkaline conditions is fairly insoluble, readilyadsorbed, and much less toxic than Cr(VI). Selenium also undergoes important redoxtransformations. Selenate (Se(VI)) is more mobile and less toxic than selenite (Se(IV)).
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