Novel electrode for electrochemical stripping analysis based on carbon paste modified with bismuth powder
Novel electrode for electrochemical stripping analysis based on carbon paste modified with bismuth powder
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DOI：
10.1016/j.electacta.2005.05.023
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发表时间：
2005-11-01
影响因子：
6.6
通讯作者：
Ogorevc, B
中科院分区：
文献类型：
--
作者：
Hocevar, SB;Svancara, I;Ogorevc, B
铋粉修饰碳糊电极（Bi-CPE）是一种有吸引力的“无汞”传感器，适用于特定重金属的电化学条带分析。电极膏是由细粉末金属铋与石墨粉和硅油混合而成。结合方波阳极溶出伏安法，在含Cd（II）和Pb（II）的未除氧溶液中对Bi-CPE进行了μ g/L的表征。该电极对两种金属的剥离信号清晰且分离，背景贡献低，对20 μ g/L的Cd（II）和Pb（II）的重现性分别为5.6%和6.0% （n = 12）。与裸碳糊电极（CPE）和铋糊电极（BiPE）相比，Bi-CPE表现出了优越的性能，并且比原位制备的铋膜碳糊电极产生了更高的响应。该电极在10 ~ 100 μ g/L Cd(II) + Pb（II）浓度范围内表现出良好的线性行为（R-2均为0.998），Cd（II）和Pb(H)的检出限分别为1.2 μ g/L和0.9 μ g/L。在自来水中添加Cd（II）和Pb（II）的实际样品中成功地测试了Bi-CPE的电分析性能。(C) 2005 Elsevier Ltd版权所有。
Bismuth-powder modified carbon paste electrode (Bi-CPE) is presented as an attractive "mercury-free" sensor applicable in electrochemical striping analysis of selected heavy metals. The electrode paste was prepared as a mixture of finely powdered metallic bismuth together with graphite powder and silicon oil. The Bi-CPE was characterized in nondeaerated solutions containing Cd(II) and Pb(II) at the mu g/L level in conjunction with square-wave anodic stripping voltammetry. The electrode exhibited well-defined and separated stripping signals for both metals accompanied with a low background contribution, and a reproducibility of 5.6 and 6.0% (n = 12) for 20 mu g/L Cd(II) and Pb(II), respectively. The Bi-CPE exhibited superior performance in comparison to the bare carbon paste electrode (CPE) and the bismuth paste electrode (BiPE) and surprisingly, yielded a higher response than the in situ prepared bismuth-film carbon paste electrode. The electrode displayed excellent linear behavior in the examined concentration range from 10 to 100 mu g/L Cd(II) + Pb(II) (R-2 = 0.998 for both), with limits of detection of 1.2 mu g/L for Cd(II) and 0.9 mu g/L for Pb(H). The electroanalytical performance of Bi-CPE was successfully tested in a real sample of tap water spiked with Cd(II) and Pb(II). (C) 2005 Elsevier Ltd. All rights reserved.