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

Journal of the Brazilian Chemical Society

Ivana Cesarino²  Glimaldo Marino¹  Jivaldo Do Rosário Matos¹  Éder T. G. Cavalheiro² 

[1] ,Universidade de São Paulo Instituto de Química de São Carlos Departamento de Química e Física MolecularSão Carlos SP ,Brazil

关键词: cadmium;    SBA-15 nanostructured silica;    carbon paste electrode;    2-benzothiazolethiol;   

DOI  :  10.1590/S0103-50532007000400021

来源: SciELO

【 摘 要 】

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 ´ 10-6 mol L-1 Cd(II) was observed with limit of detection 4.5 ´ 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.

【 授权许可】

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