Direct Simultaneous Determination of α‐ and β‐Naphthol Isomers at GC‐Electrode Modified with CNTs Network Joined by Pt Nanoparticles Through Derivative Voltammetry

The semi‐derivative technique was adopted to improve the resolution and surfactant was added to sample solution to enhance the sensitivity, α ‐ and β ‐naphthol isomers could be determined directly and simultaneously at glassy carbon electrode modified with carbon nanotubes network joined by Pt nanoparticles. In 0.1 mol L −1 HAc‐NaAc buffer solution (pH 5.8), the linear calibration ranges were 1.0×10 −6 to 8.0×10 −4 mol L −1 for both α ‐ and β ‐naphthols, with detection limits of 5.0×10 −7 for α ‐ and 6.0×10 −7  mol L −1 for β ‐naphthol. The amount of naphthol isomers in artificial wastewater has been tested with above method, and the recovery was from 98% to 103%.