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

被引：38

作者：

Takeuchi, Regina M. ^{[1
]}

Santos, Andre L. ^{[1
]}

Medeiros, Maria J. ^{[2
]}

Stradiotto, Nelson R. ^{[1
]}

机构：

[1] Univ Estadual Paulista UNESP, BR-14801970 Araraquara, SP, Brazil

[2] Univ Minho, Ctr Quim, P-4704553 Braga, Portugal

来源：

MICROCHIMICA ACTA | 2009年 / 164卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

Ethanol fuel samples; Anodic stripping voltammetry; Copper; Gold microelectrode; 2-AMINOTHIAZOLE ORGANOFUNCTIONALIZED SILICA; ATOMIC-ABSORPTION-SPECTROMETRY; TRACE-ELEMENTS; HEAVY-METALS; SPECIATION; NICKEL; ELECTRODE; IONS; LEAD; PRECONCENTRATION;

D O I：

10.1007/s00604-008-0039-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页码：101 / 106

页数：6

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