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运用循环伏安法研究了双氯芬酸钠(DS)在石墨烯(Gene)和室温离子液体1-丁基-3-甲基咪唑六氟磷酸盐(BMIMPF6)复合修饰电极上的电化学行为。DS在该复合电极上于0.65V处有一不可逆氧化峰。在40～200 mV/s范围内,其氧化峰电流与扫描速率平方根(v1/2)呈良好线性关系,表明电极过程是受扩散控制。测定了部分电极过程参数,优化了方波溶出伏安法(SWSV)的实验参数,DS浓度在1.0×10-7～1.0×10-4mol/L范围内与峰电流Ipa呈良好线性关系,检出限为8.0×10-8mol/L(S/N=3),加标回收率为95.7%～101.7%。
The electrochemical behavior of diclofenac sodium (DS) on the modified electrode of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) was studied by cyclic voltammetry at room temperature and graphene. DS has an irreversible oxidation peak at 0.65V on the composite electrode. In the range of 40 ~ 200 mV / s, the oxidation peak current has a good linear relationship with the square root of the scan rate (v1 / 2), indicating that the electrode process is controlled by diffusion. The parameters of some electrodes were measured and the experimental parameters of square wave stripping voltammetry (SWSV) were optimized. The linearity of the concentration of DS in the range of 1.0 × 10-7 ~ 1.0 × 10-4 mol / L was linear with peak current Ipa. The limit was 8.0 × 10-8mol / L (S / N = 3), and the recoveries were 95.7% ~ 101.7%.