Direct electrochemical determination of carbaryl using a multi-walled carbon nanotube/cobalt phthalocyanine modified electrode

被引:116
作者
Moraes, Fernando C. [2 ]
Mascaro, Lucia H. [2 ]
Machado, Sergio A. S. [3 ]
Brett, Christopher M. A. [1 ]
机构
[1] Univ Coimbra, Dept Quim, Fac Ciencias & Tecnol, P-3004535 Coimbra, Portugal
[2] Univ Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP, Brazil
[3] Univ Fed Sao Carlos, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
关键词
Carbon nanotubes; Cobalt phthalocyanine; Carbaryl; Electrochemical impedance spectroscopy; Square-wave voltammetry; Environmental monitoring; SPECTROPHOTOMETRIC DETERMINATION; GAS-CHROMATOGRAPHY; PESTICIDE-RESIDUES; NATURAL-WATERS; BIOSENSOR; IMMOBILIZATION; ACETYLCHOLINESTERASE; EXTRACTION; ATTACHMENT; MONOLAYERS;
D O I
10.1016/j.talanta.2009.06.013
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The electrochemical detection of carbaryl at low potentials, in order to avoid matrix interferences, is an important challenge. This study describes the development, electrochemical characterization and utilization of a glassy carbon (CC) electrode modified with multi-wall carbon nanotubes (MWCNT) plus cobalt phthalocyanine (CoPc) for the quantitative determination of carbaryl in natural waters. The surface morphology was examined by scanning electron microscopy, enhanced sensitivity was observed with respect to bare glassy carbon and electrocatalytic effects reduced the oxidation potential to +0.80V vs. SCE in acetate buffer solution at pH 4.0. Electrochemical impedance spectroscopy was used to estimate the rate constant of the oxidation process and square-wave voltammetry to investigate the effect of electrolyte pH. Square-wave voltammetry in acetate buffer solution at pH 4.0. allowed the development of a method to determine carbaryl, without any previous step of extraction, clean-up, or derivatization, in the range of 0.33-6.61 mu mol L-1, with a detection limit of 5.46 +/- 0.02 nmol L-1 (1.09 +/- 0.02 mu g L-1) in water. Natural water samples spiked with carbaryl and without any purification step were successfully analyzed by the standard addition method using the GC/MWCNT/CoPc him electrode. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:1406 / 1411
页数:6
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