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A new grafted polymer electrode self modified with activated carbon (GPESMAC) was fabricated and electrochemical characterization by cyclic voltammetric analysis. The polystyrene was used as polymer grafted with acrylonitrile as a monomer and activated carbon as improvement material using gamma irradiation to produce a new copolymer. The redox process of K3Fe(CN)6 during cyclic voltammetry was studied with the new working electrode (GPESMAC) by cyclic voltammetric analysis. The physical properties of these electrodes have high hardness, insolubility, and stability at different high temperatures. Also, the sensitivity under conditions of cyclic voltammetry is significantly dependent on different scan rate and concentrations. The GPESMAC was characterized by surface analytical methods including SEM and AFM. Interestingly, the redox reaction of Fe(III) solution using GPESMAC remained constant even after 15 cycles. It is therefore evident that the GPESMAC possesses some degree of stability. The potential use of the grafted polymer as a useful electrode material is therefore clearly evident. It is through the study of applications in quantitative and qualitative analysis proved that the conductivity of grafted polymer with activated carbon is highly efficient and stability compared with the commercial solid electrodes and modified by mechanical means or by evaporating the solvent, such as glassy carbon electrode. On the other hand an enhancement of redox current peaks and high detection limits effective species such as Fe(II)/Fe(III) was studied.

A modification glassy carbon electrode was fabricated as biosensors by mechanical attachment with carbon nanotubes to detect the effect of different concentrations of ascorbic acid (AA) on mercury ions in blood of human healthy samples using cyclic voltammetric technique. The oxidation potential peak of mercury ions in blood medium was appeared at 0.2 V, while the same peak in KCl as a supporting electrolyte appeared at 0.25–0.3 V. It was observed that the different concentrations of AA which are added to the mercury ions enhanced the oxidation current peak by raising the formation of decomposition complex in blood composition. This phenomenon appears while using seafood with lemon juice (as AA) which leads to the death if the percentage of mercury ions in the seafood was high. AA with mercury ions in blood media works as electrocatalysis by enhancing the oxidation current peak of mercury ions. It was very important to use the biosensor in the higher indicating analysis of the decomposition of the damage blood with higher sensitivity.