Electrochemical sensor based on ionic liquid and carbon black for voltammetric determination of Allura red colorant at nanomolar levels in soft drink powders

摘要: Abstract The ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate and carbon black (CB) nanoparticles were incorporated within a crosslinked chitosan film over the surface of glassy electrode, obtained architecture explored to sensitive voltammetric sensing Allura red colorant in soft drinking powders. different electrodic surfaces morphologically electrochemically characterized. From modification electrode with IL CB, significantly enhanced response was achieved toward irreversible oxidation reaction. type amount employed step as well all others experimental parameters affecting sensor by square-wave adsorptive anodic stripping voltammetry (SWAdASV) systematically optimized. Under optimum conditions, proposed SWAdASV procedure provided linear analytical curve concentration range 3.98 × 10−8 9.09 × 10−7 mol L−1 low limit detection 9.1 × 10−10 mol L−1 (0.91 nmol L−1). presented good precision no matrice effects shown from repeatability tests, concomitant studies addition/recovery assays. developed applied successfully determination content commercial drink powder samples, results close agreement those using comparative spectrophotometric method at confidence level 95%.