Electroanalytical Performance of Surfactant-Modified Composite Carbon Paste Electrode for the Sensitive and Selective Determination of Fast Sulphon Black F

A sensitive and selective voltammetric sensor was fabricated by incorporating carbon paste into multiwalled carbon nanotubes, followed by drop coating of sodium dodecyl sulfate (SDS), onto the surface in an attempt to find an approachable method for the electrochemical analysis of Fast Sulphon Black F. This equipped SDS-modified composite carbon paste electrode (SDSMCCPE) exhibited an efficient electrocatalytic behavior in the oxidation of FSBF and portrayed a well resolved, irreversible oxidation peak at a potential of 0.716 V, with an enhanced current sensitivity of 34.50 mu A in 0.2 M phosphate buffer solution of pH 6.5. The SDSMCCPE and bare composite carbon paste electrode were characterized via field-emission scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The modified electrode exhibited two dynamic linear ranges between 2-40 and 45-200 mu M and a promising detection limit of 2.4 x 10(-8) M was found for the first linear range. Thus, the fabricated sensor is a promising methodology for the concurrent determination of FSBF, tartrazine and indigo carmine, and can also be used in the study of the potential interference of synthetic dyes. SDSMCCPE involves a simple fabrication procedure, has a quick response, has admirable stability, is reproducible and has antifouling effects.

Automated summary

The sensor fabricated with the SDSMCCPE method offers a simple fabrication procedure, quick response, admirable stability, reproducibility, and antifouling effects, making it a promising methodology for the concurrent determination of FSBF, tartrazine, and indigo carmine.