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

Autor(es)

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

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Eclética Química; v. 32, n. 2, p. 23-28, 2007-00-00.

Resumo

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)

• Processo FAPESP: 03/02630-0 - Desenvolvimento e aplicação de eletrodos compósitos à base de poliuretana/grafite e borracha de silicone/grafite
• Beneficiário: Éder Tadeu Gomes Cavalheiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/04297-1 - Aplicação de eletrodos compósitos à base de poliuretana/grafite e borracha de silicone/grafite II
• Beneficiário: Éder Tadeu Gomes Cavalheiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular