2011•Journal of Xinyang Normal UniversityRequires access

Determination of Lead and Cadmium by Differential Pulse Stripping Voltammetry Based on Graphene Oxide and Hematoxylin Modified Glassy Carbon Electrode

Jingjing Yang

Abstract

Hematoxylin was electrodeposited on graphene oxide immobilized on the surface of a glassy carbon electrode(GCE).The results show that hematoxylin-graphene oxide significantly improved the electrochemical response towards Pb2+ and Cd2+ in comparison with bare GCE.The peak currents varied linearly with the concentration of Pb2+ and Cd2+ over the range of 0.01~1 μmol/L with the detection limit of 8 and 1 nmol/L,respectively,after 220 s accumulation at-1.1 V in 0.1 mol/L NaAc-HAc(pH 3.5) buffer solution.The correlation coefficient is between 0.991~0.995.Using this modified electrode,trace levels of Pb2+ and Cd2+ in water samples were determined with the recoveries of 92.2%～105.8%.

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Key concepts: Graphene, Oxide, Detection limit, Cadmium oxide, Electrode, Differential pulse voltammetry, Stripping (fiber), Analytical Chemistry (journal)