ELECTROCHEMICAL COMPARISON OF PHENOLIC ANTIOXIDANTS IN CONSERVATION OF IRON GALL INK PAPERS

Electrochemical behavior of three synthetic antioxidants, Butylated hydroxyltoluene (BHT), Butylated hydroxylanisole (BHA), and tert-Butyl hydroquinone (TBHQ) was researched by differential pulse voltammetty (DPV) technique on carbon paste electrode (CPE). According to this, a new method for the simultaneous determination of BHA, BHT, and TBHQ alone or in their mixtures was developed in order to obtain optimum concentration antioxidants against "ink corrosion" phenomenon in the iron gall inked papers. DPV can be used for quantitative data determination and also analysis studies on the kinetics, thermodynamics and mechanism of electrochemical reaction parameters. The voltammetric peaks of these antioxidants show well-defined and separated oxidation peaks based on their oxidation of BHA, BHT, and TBHQ. The proposed procedure is to provide a relationship between the peak current and analyte concentration. In addition, we found that during the redox reactions of TBHQ, BHA, and BHT, the redox peak currents increased and peak potentials highly shifted that these conditions can be attributed to the advantages of their strongly electro-active electrode. More results suggest that they have the same oxidation products. The obtained results indicate the sensitive, precise, and accurate method that can be an analytical alternative for existing methods.