Chromium Geochemistry: Eh-pH diagram-Toxicity-Stability Diagrams
Chromium is highly insoluble in water. Chromium can only be in solution at a very low pH below 3.5. In this exercise we will generate Eh-pH diagrams to study stable and soluble phases. Cr(VI) is much more toxic and mobile than Cr(III). So, speciation of chromium is very important. Hexavalent chromium exists in alkaline, strongly oxidizing environments while Trivalent chromium exists in moderately oxidizing and reduced environments.