Simultaneous Determination of Cadmium, Lead, Copper and Mercury Ions Using Organofunctionalized SBA-15 Nanostructured Silica Modified Graphite - Polyurethane Composite Electrode

Autor(es)

Cesarino, Ivana ^[1] ; Cavalheiro, Eder T. G. ^[1] ; Brett, Christopher M. A. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Quim Sao Carlos, Dept Quim & Fis Mol, BR-13566590 Sao Paulo - Brazil

^[2] Univ Coimbra, Fac Ciencias & Tecnol, Dept Quim, P-3004535 Coimbra - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 22, n. 1, p. 61-68, JAN 2010.
• Citações Web of Science: 69

Resumo

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 Cd(2+), Pb(2+), Cu(2+) and Hg(2+) in natural waters was achieved. (AU)

• Processo FAPESP: 08/03537-7 - Desenvolvimento e aplicação de eletrodos compósitos à base de grafite-poliuretana e grafite-borracha de silicone-III: modificação com nanotubos de carbono e polímeros molecularmente impressos
• Beneficiário: Éder Tadeu Gomes Cavalheiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular