Electrochemical Behavior of Rutin in [bmim] BF4 Ionic Liquid and Influence Factors

In the medium hydrophilic ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4), the electrochemical behaviorsof rutin(Rt) were studied by linear sweep voltammetry and cyclic voltammetry. The influences of scan rate, accumulation time and temperature on the electrochemical characteristics of Rt were also discussed. The experimental results indicated that the electrode process of Rt was a quasi-reversible process with absorption, and the electron transfer number was 2. The standard rate constant k(s) of Rt was 0. 126 s(-1) in [bmim]BF4. The effects of water or ethanol on the electrochemical behavior of Rt were investigated systematically. With the increasing of amount of water or ethanol, the peak potential of Rt shifted negatively and the peak current increased, and water affected the system more obviously than ethanol. In the [bmim]BF4-H2O system, a linear dependence of oxidation current on Rt concentration was obtained in the range of 4. 0 x 10(-5)-1. 4 X 10(-4) mol/L, the detection limit was 1. 0 x 10(-5) mol/L. This method could be applied to the determination of rutin content.