Electrochemical Sensor for the Determination of Alizarin Red-S at Non-ionic Surfactant Modified Carbon Nanotube Paste Electrode

The Cyclic Voltammetric (CV) behavior of Alizarin Red-S (ARS), which is an Anthraquinone dye was examined by utilizing TX-100 modified carbon nanotube paste electrode (TX-100MCNTPE). The surfactant utilized is TX-100, and it has been found that it has good electrocatalytic activity towards ARS. Distinctive parameters like pH, scan rate, detection limit have been studied in the potential range of 0.4 V to 1.0 V by using 0.2 M phosphate buffer solution (PBS) as supporting electrolyte. From these studies, it was clear that ARS shows well characterized irreversible oxidation peak in the solution of pH 6.5 at a scan rate of 0.1 V/s. Scan rate studies reveal that the entire process is adsorption controlled. Oxidation peak current rises linearly with the increase in the concentration of ARS. Two linear range is observed in the array of 2 × 10-6 to 10 × 10-6 M and 15 × 10-6 to 35 × 10-6 M. First linear range with a limit of detection (LOD) and limit of quantification (LOQ) of 1×10-6 and 3×10-6 M respectively was considered. The fabricated sensor can be productively employed for the simultaneous determination of ARS and Tartrazine (TZ).