银纳米粒子修饰电极的优化及在抗坏血酸测定中的应用

Optimization of silver nanoparticle modified electrode and application in determination of ascorbic acid

以离子液体[BMIM]BF4及银纳米粒子为原料,按一定比例混合修饰玻碳电极,研制了电化学传感器。借助紫外可见分光光度法、循环伏安法及阻抗等手段对电极性能进行了研究。探讨了银纳米粒子与离子液体的比例对修饰电极的性能的影响,对修饰电极进行了优化。电化学传感器应用于实际样品中的抗坏血酸测定,加标回收率可96.3%,RSD为2.3%。

An electrochemical sensor was prepared by modifying a glassy carbon electrode using the mixture of ionic liquid （ [ BMIM ] BF4 ） and silver nanoparticles with the certain ratio. The performance of electrode was measured by UV-vis spectrometry, cyclic vohammetry, and impedance test. Effects of ratio of silver nanoparticle and ionic liquid on the property of the modified electrode were discussed and the modified electrode was optimized. Electrochemical sensor was applied into the determination of ascorbic acid in real sample. The results showed that the method possessed high accuracy and precision with the recovery of 96.3% and RSD of 2. 3%. The electrochemical sensor is a promising analytical platform in the detection of food and drug.