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目的:制备[BMIM]PF6-MnO2-CHIT/GCE修饰电极,研究酚磺乙胺(ETH)在该电极上的电化学行为及其测定方法。方法:循环伏安法和微分脉冲伏安法。结果:ETH在[BMIM]PF6-MnO2-CHIT/GCE上的循环伏安图上出现1对灵敏、可逆的氧化还原峰,其氧化峰电流响应是其在MnO2-CHIT/GCE上的2.8倍,峰电位差降低到0.029 V,电子转移速率常数Ks=0.283 s-1。ETH在[BMIM]PF6-MnO2-CHIT/GCE上的微分脉冲伏安扫描峰电流与其浓度在5.0×10-7~5.0×10-4mol.L-1范围内呈良好的线性关系,检出限为5.0×10-8mol.L-1。连续5次测定1.0×10-5mol.L-1酚磺乙胺溶液的RSD为1.8%。结论:本法可靠、快捷、灵敏,可用于酚磺乙胺注射液中酚磺乙胺含量的电化学定量测定,结果满意。
OBJECTIVE: To prepare [BMIM] PF6-MnO2-CHIT / GCE modified electrode and study its electrochemical behavior and its determination method. Methods: Cyclic voltammetry and differential pulse voltammetry. Results: One pair of sensitive and reversible redox peaks appeared on the cyclic voltammogram of [BMIM] PF6-MnO2-CHIT / GCE. The peak current response of ETH was 2.8 times that of MnO2-CHIT / The peak potential difference decreased to 0.029 V, electron transfer rate constant Ks = 0.283 s-1. The peak current of differential pulse voltammetry of ETH at [BMIM] PF6-MnO2-CHIT / GCE showed good linearity with the concentration in the range of 5.0 × 10-7 ~ 5.0 × 10-4mol.L-1. The detection limit 5.0 × 10 -8 mol·L -1. The RSD of the 1.0 × 10 -5 mol.L-1 ethanesulfonamide solution was determined to be 1.8% for five consecutive times. Conclusion: This method is reliable, fast and sensitive, and can be used for the determination of the content of metsulfuron - ethyl in mesylate. The results are satisfactory.