Information Analysis, Tyrosine Electrochemical Oxidation

The rapid development of modern science and technology provides enormous convenience for achieving information of research system, however, precise determination for the essence of research system demands properly treat experimental data, so the selection, disposal and conformity of information become more important than before. In viewing of this, this thesis is based on the electrochemical oxidation system of L-Tyrosine which is investigated by cyclic voltammetry and AC impedance technique. Furthmore, the introduction of new scientific method is paied attention. The main work and fundamental conclusions are outlined as follow:一 The analysis and assessment of corresponding references are carried out, then the main idea and process are ascertained.二 The electrochemical oxidation of L-Tyrosine on the glassy carbon electrode in a constant ionic strength Britton-Robinson buffer solution (I=0.5) was investigated by cyclic voltammetry. The parameters of the equivalent circuits are parsed and applicability of model is estimated. By examining the CV information, the basic results are gotten:1. The electrochemical oxidation of L-Tyrosine on the glassy carbon electrode is an irreversible charge transfer system involving the weak adsorption of electroactive species.2. The pH value of the solution can make important influence on the electrochemical oxidation system.三 The AC impedance studies of L-Tyrosine electrochemical oxidation and information analysis. In order to choose a suitable equivalent circuit, a nonlinear curve fitting is carried out with the help of EQU, the model characteristics of the equivalent circuit are analyzed. The following conclusions can be drawn upon:1. Owing to the existences of adsorptive behavior and the impacts of concentration polarization and dispersion, the equivalent circuits include both multiple elements (Ca[RaYw]) and constant phase element Q describing the structure of double-layer cell.2. The vole d.c. and the adsorption of electroactive species are two obvious influencing factors of the structure of double-layer cell which in turn affect reactive rate.3. Time constant corresponding state variable and the value and proportion of other related parameters seriously influence on recognition of time constant.4. In impedance spectra model, both the curves of resistance parameters vs q> and those of capacitance parameters vs cp have same variational trend. Moreover, the two kinds of parameters take on complementarity each other.All these facts reflect the relation of current density and electrode potential.5.Uniform formula can depicts quantificationally the curves ofparameters , k1 and k1 vs , so it is suggested that these three parameters depend on