Graphite Electrode Surface Fixed With Potassium Ferricyanide Method And Analysis Applications

Chemically modified electrode is characterized by the largest molecular level in the electrode surface modification by functional groups of the modified layer, the electric catalysis, separation, enrichment, selective response been widely used. At present, the chemically modified electrode method and technology development and its electrochemical luminescence and electrochemical analysis of the joint is still one of the areas of chemical research focus.This paper by the review and study reports of two parts. the first part of review, mainly introduces chemical modify electrode of the principles, method, application, and the layers of the assembly technology of the principles, method and the electrochemical methods of analysis of the application of the sensor; The second part of the research reportt, we fixed potassium ferricyanideiron on the surface of the graphite electrode by Layers of the assembly technology and Drop-coating with the way, the Chitosan- PVA composite membrane was fixed self-assembled potassium ferricyanide modify graphite electrode, built Fe(CN)63--ECL sensors to study self-assembled Fe(CN)63- Modified Electrode and electrochemical luminescence behavior, the development of the modified electrode materials and fixation methods. Concrete work includes:1. Self-assembly of CTAB-Fe(CN)63"-CTAB Preparation of modified graphite electrode and its analytical applicationTo the existence of critical micelle concentration of cationic surfactant CTAB can effectively handle attached to the wax by boiling the surface of graphite electrode, graphite electrode surface at this time with a large amount of positive charge, through self-assembly technology in graphite electrode surface by electrostatic attraction potassium ferricyanide with a negatively charged anion form a composite membrane, so that the establishment of a fixed Ferricyanide anion composite membrane and method, and by contact angle, electrochemical and electrochemiluminescence study of the composite film characteristics. The results show that: long-chain structure of CTAB enhanced the paraffin with graphite electrodes attached to the surface adhesion,Improve the electrode surface unit area Fe(CN)63- the amount of adsorption, Modified electrode to show good electrocatalytic behavior, electrochemical luminescence behavior, A self-assembled monolayers by a fixed Fe(CN)64-/3- probe for new ways.2. Electrochemistry and Electrochemiluminescence performances of Chitosan-PVA-Fe(CN)63--CTAB composite film immobilizing and its analytical application To 0.5% Chitosan solution,0.5% PVA solution was mixed, drops on the potassium ferricyanide self-assembled modified electrode surface, and then the electrode immersed in potassium ferricyanide solution, the use of chitosan to the adsorption of potassium ferricyanide to enhance the amount of electrode surface modification. Under the optimal experimental conditions, the detection limit was 5×10-7 mol/L for isoniazid and the linear range extended from 1.5×10-4-1.5×10-6 mol/L. Compared with chemiluminescence detection isoniazid, the modified graphite electrode can used repeatedly,had better sensitivity for the determination of. isoniazid...