| The chemically modified film electrodes include single molecule layer and multi-molecule layer, by the size of the electrodes surface micr-configuration. The research of polymer film modified elecrodes is the furthest in the multi-molecule layer modified electrodes.The polymer films have three dimension configuration, which supply much available energy field. The thickness of the films is about 10-1000nm, which is equal to few undrehd or ten thousand single molecule layer. There are a lot of active group in the polyme films . The polyme films have electrochemical catalyze characteristics. On the other hand, the polymer films with choice chemical function group have some special character and expectable reaction is done on the films.The preparations of the polymer films are very simple. The modified polymers are affluent. There are electric and not electric. The polymer film modified electrode also have many other choiceness character . For example, a great deal of polymers have been saled or synthesized; the polymer films usually have chemical , mechanical and electrochemical stability; the thickness of films can be changed. So the polymer film modified electrode have very good development foreground on the application or research.In my paper , the monomer with special tunction group have Deen polymerized on the electrode by the electrochemical way . The polymer film modified electrode and compound film modified have been prepared. The electrocatalytic capability, adsorbing capability and so on have been investigated. The samples have been analyzed with the films successfully.The polymerization condition of L-lysine at glassy carbon electrode and the electrochemical characteristics of the modified electrode had been investigated. It was found that the the polymer showed strong catalytic effects on the electrooxidation of Norepinephrine. Under the normal physiological condition , Norepinephrine was determined by square wave voltammetry after preconcentration for 2. Omin at - 0.2V, . The anodic peak current showed a linear relationship with the concentration of Norepinephrine. The modified electrode shows excellent stability and reproducibility.The polymerization condition of L-Glutamic Acid at glassy carbon electrode and the electrochemical characteristics of the modified electrode had been investigated. It was found that the the polymer showed strong catalytic effects on the electrooxidation and electodeoxidization of Dopamine and Norepinephrine. Under the phosphate (PH6. 0) cushion solution , collecting 2. 0 min, dopamine and epinephrine was determined by cathode impulse voltammetric method , linearity between the deoxidization peak current and theconcentration of dopamine was obtained . The modified electrode shows excellent stability and reproducibility.The polypenylanine-Ni film modified electrode and its electrochemical behavior was sdudied by cyclic voltammetry. The experiments confirmed the electrocatalytic oxidation of formaldehyde on the modified electrode. Over the rang 1.0×10-1-5×10-4mol/L , the peak currents are linearly proportional to the concentration of formaldehyde, the detection limit is 1.1×10-5mol/L. The modified electrode was used to measure formaldehyde in aqueous solution.4-(2-pyridytazo)-resorcinol(PAR) is modified on the carbon electrode by the electrochemistry method in the ethanol and KclO4 solution, so the poly-PAR film modified electrode is made. It is investigated that adsorption and volt-ampere speciality of the modified electrode on bismuth and lead ion. The modified electrode is exploited for the preconcentration bismuth and lead ion at - 0. 2V, and then, bismuth and lead ion are detemined in the 0.1mol/L HCl by the difference puls voltampere method. The detection limit of bismuth ion is 8. 3×10-11mol/L and lead ion is 1.7×10-10 mol/L (S/N=3). The relative standard deviation for eight determinations of 1×10-6 mol/L bismuth ion is 4. 7% and lead ion is 3. 3%. |
PDF Full Text Request