All chemicals, lead nitrate (Pb(NO3)2), Zinc nitrate (Zn(NO3)2), Cadmium nitrate (Cd(NO3)2), Nickel nitrate (Ni(NO3)2), potassium permanganate (KMnO4), Hydrogen Peroxide (H2O2), Sodium hydroxide (NaOH), nitric acid (HNO3), Zinc sulfate heptahydrate (ZnSO4.7H2O), and potassium hydroxide (KOH) were provided by Merck company (Germany) and used without any further purification.
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