Zbeda, SalmaPokpas, KeaganTitinchi, Salam J.J.Jahed, NazeemBaker, PriscillaIwuoha, Emmanuel I.2017-06-132017-06-132013Zbeda, S. et al. (2013). Few-layer binder free graphene modified mercury film electrode for trace metal analysis by square wave anodic stripping voltammetry. International Journal of Electrochemical Science, 8: 11125-111411452-3981http://hdl.handle.net/10566/2974A binding agent free graphene modified glassy carbon electrode in combination with an in situ plated mercury film electrode (Gr-GC-HgFE) was used as a highly sensitive electrochemical platform for the determination of Zn2+, Cd2+ and Pb2+ in 0.1 M acetate buffer (pH 4.6) by square-wave anodic stripping voltammetry (SWASV). Instrumental parameters such as deposition potential, deposition time and electrode rotation speed were optimized. The Gr-GC-HgFE sensing platform exhibited improved sensitivity for metal ion detection, in addition to well defined, reproducible and sharp stripping signals. Two linear calibration curves ranging from 0 –10 μg L−1 and 0 – 60 μg L−1 were identified yielding detection limits of 0.08 μg L−1, 0.05 μg L−1 and 0.14 μg L−1 for Zn2+, Cd2+ and Pb2+, respectively, for simultaneous analysis and 0.04 μg L−1, 0.11 μg L−1 and 0.14 μg L−1 for Zn2+, Cd2+ and Pb2+, respectively, for individual analysis when using a deposition time of 120 s. For practical applications recovery studies using tap water samples spiked with target metal ions gave recoveries within 10% of the spiked amount. Much better recoveries were obtained for the individual analysis in comparison with simultaneous analysis.ennternational Journal of Electrochemical Science is an international peer-reviewed and open access journal that publishes original research articles, short communications as well as review articles in the field of electrochemistry.GrapheneModified mercury filmSquare wave anodic stripping voltammetryHeavy metalsArticle