Electrochemical behaviors and electrochemical determination of 1-naphthaleneacetic acid at an ionic liquid modified carbon paste electrode

Abstract

Electrochemical behaviors of 1-naphthaleneacetic acid (NAA) at an ionic liquid N-butylpyridinium hexafluorophosphate (BPPF 6/CPE) modified carbon paste electrode was investigated by cyclic voltammetry (CV) and further used for NAA sample determination. The experimental results showed that NAA at both the bared and the modified electrode showed an irreversible oxidation process, but at the modified electrode it exhibited an enhanced electrochemical response towards its electrochemical oxidation. BPPF 6/CPE was characterized by electrochemical impedance spectroscopy (EIS). At the same time, the electrochemical kinetic parameters were determined at both electrodes. The oxidation peak currents increased linearly with NAA concentration range from 2.0 × 10 -5 to 4.0 × 10 -4 mol dm -3 with the detection limit (S/N = 3) of 1.690 × 10 -7 mol dm -3 under the optimized experiment conditions. The proposed method was successfully applied for NAA content determination in both commercial formulations and the soil samples.