Selective Voltammetric Determination of Tartrazine in the Presence of Red ۱۰B by Nanogold-modified Carbon Paste Electrode

چکیده مقاله

A nanogold modified carbon paste electrode (NG-CPE) was fabricated and used as selective voltammetric sensor for determination of Tartrazine in the presence of Red 10B using cyclic voltammetry (CV), differ-ential pulse voltammetry (DPV), and chronoamperometry (CHA). Electrochemical parameters including the diffusion coefficient (D), theelectron transfer coefficient (), and the electron transfer number (n) were determined for the oxidation of Tartrazine. This modified electrode can be applied to simultaneous determination of Tartrazine and Red 10B, because of considerable decreases of anodic overpotentials for both compounds. After optimizing the experimental conditions, the anodic peak current of Tartrazine was linear to its concentration in the range of 0.05-1.5 µmol L -1 , and the detection limit was 0.017 µmol L -1 in phosphate buffer solution (PBS) at pH 4.0. The modified electrode has good stability and repeatability. It was applied to the determination of Tartrazine and Red 10B in soft drinks with satisfactory results.