硫酸双肼屈嗪在碳糊电极上的吸附伏安测定法的研究

Adsorptive Voltammetry of Dihydralazine on Carbon Paste Electrode

目的:研究硫酸双肼屈嗪在碳糊电极上的电化学行为及检测方法。方法:在0.1molL-1氢氧化钠底液中,通过富集用碳糊电极吸附伏安法测定硫酸双肼屈嗪。结果:阴极峰电位为-0.224 V（vs.SCE）,峰电流与硫酸双肼屈嗪的浓度在2.8×10-7～39×10-5mol·L-1范围内呈良好的线性关系。该方法的检出下限为5.7×10-8mol·L-1。对常压片中硫酸双肼屈嗪含量用本法进行了测定,获得了满意的结果。结论:本方法的优点是成本低,操作方便,重现性好及检测下限较低。本文对电极响应机理进行了探讨,硫酸双肼屈嗪的电极过程是一个两电子两质子的准可逆过程。

Objective: Investigation of electrochemical behaviors of dihydralazine sulfate and its determination. Method: Dihydralazine was concentrated at carbon paste electrode and determined by adsorptive voltammetry in 0.1 mol ·L-1 NaOH solution. Results: The cathodic peak potential of dihydralazine was - 0.224 V ( vs·SCE) . The peak currents were proportional to the concentration of dihydralazine in the range of 2.8×10-7-3.9×10-5 mol·L-1, and the detection limit was 5.70×10-8 mol·L-1. Satisfactory results were obtained in the determination of dihydralazine tablet. Conclusion: This method is simple, of low cost with good reproducibility and low detection limit. The electrochemical behavior and reaction mechanism of dihydralazine at carbon paste electrode were discussed. It showed that the electrode process was quasi - reversible with two electrons and two protons.