Chromium is present in two forms: trivalent Cr(III) which is poorly transported across membranes and hexavalent Cr(VI) can readily cross cellular membranes. Inside the cell, the hexavalent form is reduced to the trivalent form. This biotransformation process reduces the toxicity because the trivalent form does not cross cellular membrane rapidly. The trivalent form complexes with intracellular macromolecules, these toxic compounds are responsible for many toxic and mutagenic effects of chromium, not biodegradable and accumulate in the environment [4] and [5].