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

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Author(s):	Cesarino, Ivana ^[1] ; Cavalheiro, Eder T. G. ^[1] ; Brett, Christopher M. A. ^[2] Total Authors: 3
Affiliation:	^[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 Total Affiliations: 2
Document type:	Journal article
Source:	Electroanalysis; v. 22, n. 1, p. 61-68, JAN 2010.
Web of Science Citations:	69
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 Cd(2+), Pb(2+), Cu(2+) and Hg(2+) in natural waters was achieved. (AU)

FAPESP's process:	08/03537-7 - Development and application of composite electrodes based on graphite-poliurethane and graphite-silicone rubber-III: modification with carbon nanotubes and molecularly imprinted polymers
Grantee:	Éder Tadeu Gomes Cavalheiro
Support Opportunities:	Regular Research Grants