Electrochemical reduction of C.I. Acid Red 18 on multi-walled carbon nanotubes and its analytical application

The electrochemical reduction of C.I. Acid Red 18 on the surface of multi-walled carbon nanotube-modified glassy carbon electrode was investigated using cyclic voltammetry. A novel, simple, sensitive and inexpensive method for determination of C.I. Acid Red 18 in soft drinks was proposed and the accuracy and reproducibility of this determination method were evaluated. The method was satisfactorily applied for the determination of C.I. Acid Red 18 in soft drinks in the concentration range 3.30 × 10−7–1.24 × 10−4 M, with a detection limit of 1.65 × 10−7 M.