Using the organofunctionalised SBA-15 nanostructured silica as a carbon paste electrode modifier: determination of cadmium ions by differential anodic pulse stripping voltammetry

Author(s)

Ivana Cesarino ^[1] ; Glimaldo Marino ^[2] ; Jivaldo do Rosário Matos ^[3] ; Éder T. G. Cavalheiro ^[4]

Affiliation

^[1] Universidade de São Paulo. Instituto de Química de São Carlos. Departamento de Química e Física Molecular - Brasil

^[2] Universidade Federal da Paraíba. Departamento de Química - Brasil

^[3] Universidade de São Paulo. Departamento de Química Fundamental - Brasil

^[4] Universidade de São Paulo. Instituto de Química de São Carlos. Departamento de Química e Física Molecular - Brasil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 18, n. 4, p. 810-817, 2007-00-00.

Abstract

The performance of a carbon paste electrode (CPE) modified with SBA-15 nanostructured silica organofunctionalised with 2-benzothiazolethiol in the determination of Cd(II) ions in natural water is described, based in a DPASV procedure. The Cd(II) oxidation peak was observed around -0.85 V (vs. SCE) in phosphate buffer (pH 3.0). The best results were obtained under the following optimised conditions: 100 mV pulse amplitude, 2 min accumulation time, 10 mV s-1 scan rate in phosphate buffer pH 3.0. Using such parameters a linear dynamic range from 1.00 to 10.0 <FONT FACE=Symbol>´</FONT> 10-6 mol L-1 Cd(II) was observed with limit of detection 4.5 <FONT FACE=Symbol>´</FONT> 10-7 mol L-1. Cd(II) spiked in a natural water sample was determined with 96.4% mean recovery at µmol L-1 level. The results indicate that this electrode is sensitive for determination of Cd(II). Interference of some divalent cations were also evaluated. (AU)

• FAPESP's process: 05/04297-1 - Application graphite/polurethane and graphite/silicon rubber composite electrodes II
• Grantee: Éder Tadeu Gomes Cavalheiro
• Support Opportunities: Regular Research Grants