壬基酚基于乙炔黑/壳聚糖膜修饰电极的电化学测定

Electrochemical Determination of Nonylphenol Based on Acetylene Black/Chitosan Film Modified Electrode

构建了一种基于乙炔黑/壳聚糖膜修饰电极的壬基酚电化学测定方法.分别实验了壬基酚在裸玻碳电极和膜修饰电极上的电化学行为,并对实验条件进行了优化.结果表明,壬基酚在pH 7.0的磷酸盐缓冲体系中,在乙炔黑/壳聚糖膜修饰电极上具有灵敏的电化学响应.相对于裸玻碳电极,壬基酚在膜修饰电极上的氧化峰电流大大提高,峰电位负移50 mV,表明膜修饰电极对壬基酚的电化学氧化具有一定的催化作用.循环伏安实验结果还表明,壬基酚的氧化峰电流与其浓度在1×10 9～1×10 6mol/L范围内呈良好的线性关系,检测限可达5×10 10 mol/L(基于S/N=3).此外,该膜修饰电极还具有较好的稳定性和一定的抗干扰能力.将该修饰电极应用于三角湖水样中壬基酚的电化学测定,结果令人满意.

The electrochemical method for the determination of nonylphenol based on the acetylene black/ chitosan film modified electrode was developed.The electrochemical behaviors of no-nylphenol at the bare electrode and at the film electrode were investigated respectively and the experimental conditions were optimized.The experimental results indicated that the obvious electrochemical response of nonylphenol was shown at the black/chitosan film modified electrode in pH7.0 phosphate buffer solution.Compared with the bare electrode,the oxidation peak current increased greatly at the film electrode and the peak potential shifted negatively about 50 mV,which indicated that the film electrode had a good catalytic effect to the oxidation of nonylphenol.The repeatability and stability of the modified electrode were also investigated.The electrochemical behaviors of nonylphenol were investigated.The cyclic voltammetric experimental results also showed that there existed an excellent linear relationship between oxidation peak current of nonylphenol and its concentration in the range of 110～1 10 mol/L.The detection limit is up to 5 10 mol/L（based on / = 3）.The film electrode had a good stability and an anti-interference ability.It was applied to determine nonylphenol of real water samples in Sanjiao Lake with satisfactory results.