In this work, a simple and high sensitivity electrochemical sensor was developed to determine Sudan I
based on Pt/CNTs nanocomposite ionic liquid modified carbon paste electrode (Pt/CNTs/ILCPE) using cyclic
voltammetry, electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV)
methods. The novel sensor exhibited an obviously catalytic activity towards the oxidation of Sudan I,
which can be confirmed by the increased oxidation peak current and the decreased oxidation peak potential
when compared with the bare carbon paste electrode (CPE). The electron transfer coefficient (
a), diffusion
coefficient (D), and charge transfer resistance (R
) of Sudan I at the modified electrode were
calculated. The linear response range and detection limit were found to be 0.008–600
lmol L
ct
and
0.003
lmol L
1
, respectively. Other species did not interfere with the determination of Sudan I at a surface
of propose sensor in the optimum condition. The proposed sensor was successfully applied for the
determination of Sudan I in food samples with satisfactory results.
1
کلید واژگان :
Sudan I Pt/CNTs nanocomposite Food analysis Ionic liquid
