Colloids are sensitive to change of ion or heavy metal concentration and it leads to violation of colloid stability and subsequent disintegration [23]. In medical usage, heavy metals are loosely defined [15] and include all toxic metals irrespective of their atomic weight. Heavy metal poisoning can possibly include excessive amounts of iron, manganese, aluminum, mercury, cadmium, beryllium or arsenic. Minamata disease results from mercury poisoning and Itai-Itai disease from cadmium poisoning.