Electrochemical Study and Determination of Dinitramine Using Glassy Carbon Electrodes Modified with Multi-walled Carbon Nanotubes

Abstract

A novel and sensitive method is described for voltammetric study and determination of dinitramine, commonly used pesticide, based on its electrochemical reduction at a multi-walled carbon nanotube (MWCNT) modified glassy carbon electrode. Cyclic voltammetry (CV) was used to investigate the redox properties of this modified electrode at various solutions pH values and various scan rates. CV studies indicated that the reduction process has an irreversible and diffusion-like behavior in a reduction mechanism with equal number of electrons and protons. The square-wave voltammetry (SWV) was applied as a very sensitive voltammetric detection method for the determination of dinitramine. Under optimal conditions, the proposed method exhibited acceptable analytical performances in terms of linearity (over the concentration range from 4.0 × 10−8 to 1.4 × 10−6 and 1.4 × 10−6 to 2 × 10−5 mol L−1, R2 = 0.999), detection limit (0.8 × 10−8 mol L−1) and repeatability (RSD = 2.36%, n = 10, for 5.0 × 10−6 mol L−1 dinitramine). To further validate its possible application, the method was used for the quantification of dinitramine in water samples.