Metallic nanoparticles are usually prepared by physical, biological and chemical methods. Physical methods use complex devices to create lasers, gamma rays that affect on metal or remove metal salts. Chemical and biological methods must also use metal salts, such as AgNO₃ and reducing agents or plant extracts with reducing properties. The metal nanoparticle products which are made from the above mentioned methods, contain anions of salts as well as residual reactants and intermediate products of redox reaction process or additional stabilizers substances that will affect to the safe use process for human health. The electrochemical method uses only metal anodes such as Ag, Au, Cu, Fe and the DC high voltage in the solution of distilled water, therefore, the metal nano product is complete pure  and it  is very safe to use.

Preparation of metallic nanomaterials by the DC high voltage electrochemical technology has been studied the influences of modulation technology parameters such as: voltage value, current and voltage stabilization mode, distance between anode and cathode electrode, conductivity and pH as well as temperature of the distilled water solution. The   anode electrodes studied  as  Ag, Au, Cu, Fe, W which have their own characteristic due to affectting from metallic nature and lead to electrochemical reactions on electrodes as well as the process of electroplating plasma have the difference results. The process of creating metallic nano by high voltage electrochemical reaction even in distilled water is determined by the anodic electrochemical reaction of the metals and the process of release hydrogen on the cathode from the electrolysis of aqueous. Metallic ions are reduced with fresh formation hydrogen gas in solution by the following reactions:

Me -ne ®  Meⁿ⁺

         2H₂O + 2e ®   H₂+  2OH^-

        Meⁿ⁺  + nH₂®  Me⁰  +   2nH⁺

With the high voltage and release gas on the electrode and when the temperature of the solution increases with strong electricity and magnetic fields, the  plasma will be formation, plasma dissociates water and creates large amounts of hydrogen and oxygen gas, in addition, chemistry plasma generate also the free radicals that has strong oxidizing properties  and to be used for purpose of environmental pollutant treatment. Structure and  properties of the metallic nano are determined by UV-Vis, particle size distribution device, zeta potential measurement device, TEM, bactericidal ability. The weight of metal nano in solution is determined by the anode weight loss method, Faraday's law from the amount of reaction as well as AAS. The results obtained about the properties of the nano solution as well as the ability treating environmental pollution are very dependent on the nature of the metal electrode.