Electrochemical Determination of Sunset Yellow and Tartrazine at Carbon Electrodes Modified by Fe-Zr Oxide

An electrochemical probe, highly sensitive for the detection of two colorants; sunset yellow (SY) and tartrazine (TZ), was examined. The probe was fabricated by modifying carbon electrodes with an iron-zirconium binary transition metal oxide, Fe-2 Zr2O7 . In the presence of the oxide, SY and TZ exhibit well resolved oxidation peaks at 0.80 and 1.0 V, respectively, in pH 2.00 buffer solution. The developed method exhibits linear response in the range 1.9 x 10(-5) - 2.7 x 10(-4) M for both SY and TZ. The corresponding limits of detection were found to be 5.7 x 10(-6) M for SY and 1.3 x10(-5) M for TZ.