The permselectivity of neurotransmitters such as dopamine, epinephrine, and norepinephrine at overoxidized polypyrrole (OPPY)-film-coated glassy carbon electrodes has been investigated. The chemically-modified electrodes exhibit attractive permselectivity and antifouling properties of rejecting anionic species, e.g. ascorbate, etc. Compared with the response of neurotransmitters at modified electrodes overoxidized in phosphate buffer solution (pH 7.4), higher sensitivity and reversibility response can be obtained at modified electrodes overoxidized in sodium hydroxide solution. The effect of film thickness on the permselective response was tested. Rotating disk electrode experiments were used to determine the apparent diffusion coefficients of several electroactive solutes in the OPPY films. The influence of the hydrophobicity of the organic ions on the permeability within the polymer films was discussed. Dopamine and epinephrine were determined at the 1

The voltammetric behaviour of dopamine at electropolymerized tetraaminophthalo-cyanatonickel(II) (p-NiTAPc) film coated electrodes was studied by cyclic voltammetry. The chemically modified electrodes exhibit an electrocatalytic effect on dopamine oxidation. The interference from ascorbic acid can be eliminated by additionally covering a layer of Nation on the modified electrodes. The oxidation current increased linearly with the concentration of dopamine in the range of 2

Potentiometric pH sensors based on polymer film were prepared by electropolymerization of the monomer nickel(II)-4,4',4",4'"-tetraaminophthalocyanine (NiTAPc) or copper(II)-4,4',4",4'"-tetraaminophthalocyanine (Cu-TAPc) on glassy carbon (GC) electrodes. The polymer of metal tetraaminophthalocyanine (p-MTAPc) film coated electrodes show a slope of 551 mV/pH (at 20℃) and nearly Nernstain potentiometric response to pH over the range of pH 1-13. The electrodes possess good potential reproducibility and high selectivity, and are useful sensing devices in pH determination and end-point indication of acid-base potentiometric titration.

An amperometric nitrite sensor based on a polymeric nikel tetraaminothphalocyanine (p-NiTAPc) film coated glassy carbon (GC) electrode was developed. The mechanism of catalysis on the surface of the electrode was discussed. The sensor exhibited fast respond towards nitrite with a detection limit of 1

将乙酰胆碱酯酶（AChE）固定在醋酸纤维膜上，将该膜组装在一支pH玻璃电极敏感膜表面，制成用于测定有机磷农药的电位型生物传感器，优化其制备方法。当溶液中存在有机磷农药，酶的活性受到抑制，酶活性的降低引起pH玻璃电极电位的改变，其改变程度与溶液中农药的浓度大小有关。用本文方法测定了蔬菜中的对硫磷、辛硫磷、氧乐果、敌敌畏，结果满意。