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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Copper determination in ethanol fuel samples by anodic stripping voltammetry at a gold microelectrode

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Author(s):
Takeuchi, Regina M. [1] ; Santos, Andre L. [1] ; Medeiros, Maria J. [2] ; Stradiotto, Nelson R. [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Paulista UNESP, BR-14801970 Araraquara, SP - Brazil
[2] Univ Minho, Ctr Quim, P-4704553 Braga - Portugal
Total Affiliations: 2
Document type: Journal article
Source: Microchimica Acta; v. 164, n. 1-2, p. 101-106, JAN 2009.
Web of Science Citations: 32
Abstract

A linear sweep anodic stripping voltammetric method was developed for copper determination in commercial ethanol fuel samples by using a gold microelectrode. Under the optimized conditions, a linear range from 0.05 to 1.0 mu M was obtained, with detection limit of 22 nM. The method was employed to determine copper ions in six commercial ethanol fuel samples and the results were compared with those obtained by FAAS. This study showed that for most samples both methods produced concordant results. However, for two samples, copper is distributed in its labile and complexed forms leading to copper contents contrasting with those obtained by flame atomic absorption spectroscopy (FAAS). It was observed that acidification of the samples is a very efficient way to recover copper from its complexed forms. After acidification, the copper contents obtained were concordant with those obtained by FAAS. Thus, the method can be employed to the reliable copper determination in commercial ethanol fuel samples. Moreover, this is the first work providing some insights about copper speciation in commercial ethanol fuel samples. (AU)