Evaluation of a carbon paste electrode modified with organofunctionalised SBA-15 silica in the determination of copper

Author(s)

I. Cesarino ^[1] ; G. Marino ^[2] ; J.R. Matos ^[3] ; E.T.G. Cavalheiro ^[4]

Affiliation

^[1] Univ. de São Paulo. Inst. de Química de São Carlos - Brasil

^[2] Univ. de São Paulo. Inst. de Química de São Carlos - Brasil

^[3] Universidade de São Paulo. Dep. de Química Fundamental

^[4] Univ. de São Paulo. Inst. de Química de São Carlos - Brasil

• Document type: Journal article
• Source: Eclética Química; v. 32, n. 2, p. 23-28, 2007-00-00.

Abstract

The performance of a carbon paste electrode (CPE) modified with SBA-15 nanostructured silica organofunctionalised with 2-benzothiazolethiol for determination of Cu(II) ions in sugar cane spirit (cachaça) is described, based on differential pulse anodic stripping voltammetry (DPASV) procedure. The Cu(II) oxidation peak was observed at 0.03 V (vs. SCE) in phosphate solution (pH 3.0). The results were obtained using optimised conditions such as 100 mV pulse amplitude, 3 min accumulation time, 25 mV s-1 scan rate in phosphate solution pH 3.0, resulting in a linear dynamic range from 8.0 x 10-7 to 1.0 x 10-5 mol L-1 Cu(II) and a limit of detection 2.0 x10-7 mol L-1. Cu(II) spiked in a cachaça sample was determined with 102.5 % mean recovery at mmol L-1 level. Interference from other metallic cations present in the sample was avoided by the standard addition procedure. (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