玻碳电极打磨

The insoluble multi-walled carbon nanotubes (MWNT)was successfully dispersed intowater in the presence of hydrophobic surfactant. After that,MWNTfilm-coated glassy carbon electrode (GCE)was achieved via dip-coating and evaporatingwater. Owing to huge surface area, high sorption capacity and subtle electronic properties, MWNT film exhibits highly efficient accumulation efficiency as well as considerable surface enhancement effects to Sunset Yellow and Tartrazine. As a result, the oxidation peak currents of Sunset Yellowand Tartrazine remarkably increase at theMWNTfilm-modified GCE. Based on this, a novel electrochemical method was developed for the simultaneous determination of Sunset Yellow and Tartrazine. The limits of detection are 10.0 ngmL−1 (2.2×10−8 mol L−1) and 0.1gmL−1 (1.88×10−7 mol L−1) for Sunset Yellow and Tartrazine. Finally, the proposed method was successfully used to detect Sunset Yellow and Tartrazine in soft drinks.