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制备了聚磷钼酸/乙炔黑修饰电极(PMA/AB/GCE),用循环伏安法(CV)研究了乙萘酚(EN)在该电极上的循环伏安行为。在pH 5.5的HAc-NaAc缓冲液中,EN在该修饰电极上出现一明显的氧化峰。在60~300 mV/s扫速范围内,其氧化峰电流(I pa)与扫速平方根(v1/2)呈线性关系,表明该电极过程是受扩散控制的不可逆过程。计算电极过程的部分动力学参数:电极有效面积为0.122 cm2,质子数与电子数均为1,扩散系数为D为9.64×10-5cm2/s。运用方波伏安法测定不同浓度EN的方波伏安曲线,结果表明氧化峰电流与EN浓度在9.0×10-7~1.0×10-4mol/L范围内呈良好线性关系(r=0.992),检出限(S/N=3)为6.35×10-7mol/L,加标回收率为92.8%~102.8%。
The poly (phosphomolybdic acid) / acetylene black modified electrode (PMA / AB / GCE) was prepared and the cyclic voltammetry behavior of ethyl naphthol (EN) on the electrode was investigated by cyclic voltammetry (CV). In HAc-NaAc buffer at pH 5.5, EN showed a significant oxidation peak on the modified electrode. The linear relationship between the oxidation peak current (I pa) and the square root of the sweeping velocity (v1 / 2) in the range of 60 ~ 300 mV / s indicates that the electrode process is an irreversible diffusion controlled process. Part of the kinetic parameters for the calculation of the electrode process: the effective area of the electrode is 0.122 cm2, the number of protons and electrons are 1, and the diffusion coefficient is D = 9.64 × 10-5cm2 / s. The square wave voltammetry curves of square wave voltammetry with different concentrations of EN were measured. The results showed that there was a good linear relationship between the oxidation peak current and EN concentration in the range of 9.0 × 10-7 ~ 1.0 × 10-4mol / L (r = 0.992) , The detection limit (S / N = 3) was 6.35 × 10-7mol / L, the recoveries were 92.8% ~ 102.8%.