Ferrous Sulphate

The effect of ferrous sulphate in cement

To reduce the amount of soluble chromium in cement, chromium is changed to form an insoluble salt which does not irritate the skin. For this, the most common solution is by adding ferrous sulphate to cement. When water is added to the dry cement, a redox reaction between the bivalent iron (Fe2+) and the hexavalent chromium (Cr6+) will result in trivalent iron (Fe3+) and trivalent chromium (Cr3+). Trivalent chromium salts are almost not water soluble, herewith avoiding contact dermatitis.


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