【摘要】 文章以酪氨酸为原料,采用循环伏安法制备了酪氨酸修饰玻碳电极(L-tyrosine/GCE),并研究了该电极在NaAc/HAc缓冲溶液中对苯二酚异构体的电化学行为。当酪氨酸浓度为1×10-3 mol/L,修饰圈数为6时,该修饰电极的性能最佳。对实验条件进行优化表明:在NaAc/HAc缓冲溶液(pH=5.0)中,以100 mV/s进行CV扫描时,实验效果最佳,此时苯二酚异构体的氧化峰电位在该修饰电极上可以得到较好的分离。在最佳实验条件下,邻苯二酚在1×10-6～5×10-4 mol/L浓度范围内与其峰电流呈现良好的线性关系,检出限为2.8×10-7 mol/L。此外,该修饰电极也具有较好的抗干扰能力和重现性,应用于实际水样的检测,效果令人满意。更多还原

【Abstract】 In this paper,with tyrosine as the raw material,a tyrosine-modified glassy carbon electrode(L-tyrosine/GCE) is prepared by cyclic voltammetry,and the electrochemical behavior of the electrode for dihydroxybenzene isomers in the NaAc/HAc buffer solution is studied.The performance of the modified electrode is the best,when the concentration of tyrosine is 1 ×10-3mol/L and the number of modified circles is 6.At the same time,the experimental conditions are also optimized.The results show that the best experimental results are obtained in CV scanning at 100 m V/s in NaAc/HAc buffer solution(pH=5.0) and simultaneously the oxidation potential of the dihydroxybenzene isomers can be well separated on the modified electrode in the NaAc/HAc buffer solution(pH=5.0).Under the optimal experimental conditions,the catechol concentration in the range of 1 ×10-6～5 ×10-4mol/L shows a good linear relationship with the peak current,and the detection limit is 2.8×10-7mol/L.In addition,the modified electrode also shows good anti-interference ability and reproducibility.The proposed method is applied to the water samples with satisfactory results.更多还原