Advanced search
Start date
Betweenand
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
I. Cesarino [1] ; G. Marino [2] ; J.R. Matos [3] ; E.T.G. Cavalheiro [4]
Total Authors: 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
Total Affiliations: 4
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