Simultaneous Determination of Cadmium,Lead, Copper and Mercury Ions Using Organofunctionalized SBA‐15 Nanostructured Silica Modified Graphite–Polyurethane Composite Electrode |
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| Authors: | Ivana Cesarino Éder?T?G Cavalheiro Christopher?M?A Brett |
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| Institution: | 1. Departamento de Química e Física Molecular, Instituto de Química de S?o Carlos, Av. Trabalhador S?o‐Carlense, 400, Centro, S?o Carlos, S?o Paulo, CEP 13566‐590, Brazil;2. Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004‐535 Coimbra, Portugal |
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| Abstract: | A new sensor has been developed for the simultaneous detection of cadmium, lead, copper and mercury, using differential pulse and square wave anodic stripping voltammetry (DPASV and SWASV) at a graphite–polyurethane composite electrode with SBA‐15 silica organofunctionalized with 2‐benzothiazolethiol as bulk modifier. The heavy metal ions were preconcentrated on the surface of the modified electrode at ?1.1 V vs. SCE where they complex with 2‐benzothiazolethiol and are reduced to the metals, and are then reoxidized. Optimum SWASV conditions lead to nanomolar detection limits and simultaneous determination of Cd2+, Pb2+, Cu2+ and Hg2+ in natural waters was achieved. |
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| Keywords: | Graphite – polyurethane composite electrode SBA‐15 nanostructured silica 2‐Benzothiazolethiol Heavy metals Natural waters Cadmium Lead Copper Mercury |
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