The Determination of TNT at an Ex-Situ Prepared Bismuth Film Electrode Using Adsorptive Stripping Voltammetry. An Initial Study

Abstract

A bismuth film electrode prepared ex-situ on a glassy carbon substrate electrode (BiF-GCPE) was applied to the determination of trinitrotoluene (TNT) in combination with squre-wave adsorptive stripping voltammetry. The most favourable stripping signals in mild alkaline solutions (pH 9.0). For calibration, linear responses could be obtained in the concentration range of 0.5-5.0 ppm TNT, after deposition for 60s and within 0.1-1.5 ppm TNT after 120 s. The LOD (3σ) was estimated to be about 7 ppb (for deposition time of 240 s). Finally, possible determination of TNT in the presence of nitrobenzene was also shown.