Simultaneous Measurements of Nanotrace Amounts of Lead and Cadmium Using an Environmentally Friendly Sensor (An Activated Glassy Carbon Electrode Modified with a Bismuth Film).

IF 4.2 2区 化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Katarzyna Tyszczuk-Rotko, Aleksy Keller
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引用次数: 0

Abstract

This paper shows the fabrication of a new environmentally friendly sensor, an activated glassy carbon electrode with an in situ deposited bismuth film (aGCE/BiF), to determine Cd(II) and Pb(II) at the nanotrace level. The electrochemical activation of the GCE surface was achieved in a solution of 0.1 M phosphate-buffered saline (PBS) of pH = 7 by performing five cyclic voltammetric scans in the range of -1.5-2.5 V at ν of 100 mV/s. The newly developed electrode provides several advantages, such as an increased electron active surface (compared to the glassy carbon electrode) and improved electron transfer kinetics. As a result, the new voltammetric procedure (square-wave anodic stripping voltammetry, SWASV) was established and optimized. With the SWASV method, the following calibration curves and low detection limits (LODs) were obtained for Cd(II) and Pb(II), respectively: 5-100 nM, 0.62 nM, 2-200 nM, and 0.18 nM. The newly prepared method was used to determine the amounts of Pb(II) and Cd(II) in the certified reference material, and the results agreed with the certified values. Moreover, the procedure was successfully applied to determine the Cd(II) and Pb(II) in river samples. The official and standard addition methods validated the measurement results.

使用环境友好型传感器(用铋膜修饰的活化玻璃碳电极)同时测量纳米微量铅和镉。
本文介绍了一种新型的环境友好型传感器的制作,即带有原位沉积铋膜(aGCE/BiF)的活化玻璃碳电极,用于在纳米痕量水平上测定Cd(II)和Pb(II)。在pH = 7的0.1 M磷酸盐缓冲盐水(PBS)溶液中,以100 mV/s的ν在-1.5 ~ 2.5 V范围内进行5次循环伏安扫描,实现了GCE表面的电化学活化。新开发的电极具有几个优点,例如增加的电子活性表面(与玻碳电极相比)和改进的电子转移动力学。建立并优化了方波阳极溶出伏安法(SWASV)。采用SWASV法对Cd(II)和Pb(II)分别获得5 ~ 100 nM、0.62 nM、2 ~ 200 nM和0.18 nM的标定曲线和低检出限(lod)。用新方法测定了标准物质中Pb(II)和Cd(II)的含量,结果与认证值一致。此外,该方法还成功地应用于河流样品中Cd(II)和Pb(II)的测定。官方和标准的添加方法验证了测量结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Molecules
Molecules 化学-有机化学
CiteScore
7.40
自引率
8.70%
发文量
7524
审稿时长
1.4 months
期刊介绍: Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.
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