Simultaneous trace-levels determination of Hg(II) and Pb(II) ions in various samples using a modified carbon paste electrode based on multi-walled carbon nanotubes and a new synthesized Schiff base

被引：127
作者：
Afkhami, Abbas [1 ]
Bagheri, Hasan [2 ]
Khoshsafar, Hosein [1 ]
Saber-Tehrani, Mohammad [3 ]
Tabatabaee, Masoumeh [4 ]
Shirzadmehr, All [1 ]
机构：
[1] Bu Ali Sina Univ, Fac Chem, Hamadan, Iran
[2] Islamic Azad Univ, Takestan Branch, Dept Chem, Takestan, Iran
[3] Islamic Azad Univ, Sci & Res Branch, Dept Chem, Tehran, Iran
[4] Islamic Azad Univ, Yazd Branch, Dept Chem, Yazd, Iran
来源：
ANALYTICA CHIMICA ACTA | 2012年 / 746卷
关键词：
Simultaneous determination; Square wave voltammetry; Modified carbon paste electrodes; Heavy metals; STRIPPING VOLTAMMETRIC DETERMINATION; SIMULTANEOUS ELECTROCHEMICAL DETERMINATION; SBA-15 NANOSTRUCTURED SILICA; SOLID-PHASE EXTRACTION; HEAVY-METAL IONS; SELECTIVE DETERMINATION; COPPER II; MERCURY; LEAD; CADMIUM;
D O I：
10.1016/j.aca.2012.08.024
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A modified carbon paste electrode based on multi-walled carbon nanotubes (MWCNTs) and 3-(4-methoxybenzylideneamino)-2-thioxothiazolodin-4-one as a new synthesized Schiff base was constructed for the simultaneous determination of trace amounts of Hg(II) and Pb(II) by square wave anodic stripping voltammetry. The modified electrode showed an excellent selectivity and stability for Hg(II) and Pb(II) determinations and for accelerated electron transfer between the electrode and the analytes. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH. deposition potential and deposition time were optimized for the purpose of determination of traces of metal ions at pH 3.0. Under optimal conditions the limits of detection, based on three times the background noise, were 9.0 x 10(-4) and 6.0 x 10(-4) mu mol L-1 for Hg(II) and Pb(II) with a 90s preconcentration, respectively. In addition, the modified electrode displayed a good reproducibility and selectivity, making it suitable for the simultaneous determination of Hg(II) and Pb(II) in real samples such as sea water, waste water, tobacco, marine and human teeth samples. (C) 2012 Elsevier B.V. All rights reserved.
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页码：98 / 106
页数：9
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