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Novel in situ Bi−Sb‐Film Electrodes for Trace Heavy Metal Analysis
Electroanalysis ( IF 2.7 ) Pub Date : 2018-09-27 , DOI: 10.1002/elan.201800545
Matjaž Finšgar 1 , Barbara Petovar 1
Affiliation  

This work reports on new in situ formed Bi−Sb‐film glassy carbon electrodes (Bi−SbFEs) with different Bi(III):Sb(III) mass concentration ratios (1 : 9, 2 : 8, 3 : 7, 4 : 6, 5 : 5, 6 : 4, 7 : 3, 8 : 2, 9 : 1) and at two different total mass concentrations of Bi(III) and Sb(III), i. e. 0.5 and 1.0 mg/L. The analytical performance of these Bi−SbFEs was compared with Bi‐film (BiFE) and Sb‐film (SbFE) electrodes in 0.1 M acetate buffer solution. All combinations of Bi−SbFEs were selective for Zn(II), Cd(II), and Pb(II) detection. Bi−SbFEs showed linear concentration ranges for Zn(II), Cd(II), and Pb(II) substantially wider than that for BiFE. Moreover, the method's sensitivities can be substantially improved by using different Bi−SbFEs compared with BiFE and SbFE. Most of the Bi−SbFE methods provided satisfactory recovery for Cd(II) determination, many of them also for Pb(II), whereas for Zn(II) only a few methods provided recovery values within the 80.0–120.0 % recovery range. The precision of different Bi−SbFEs were satisfactory for Pb(II) and Cd(II) with an RSD lower than 20.0 %. Accumulation time optimisation resulted in lower LOD and LOQ, higher sensitivity. Finally, electrochemical impedance spectroscopy was employed for the first time to characterise the electroanalytical behaviour of an SbFE. The latter analysis was employed to compare the electrode's properties with pure BiFE and pure GCE, and to show when the system is under a kinetic‐ and/or diffusion‐controlled process.

中文翻译:

用于痕量重金属分析的新型原位Bi-Sb-膜电极

这项工作报告了新的原位形成具有不同Bi(III):Sb(III)质量浓度比(1:9、2:8、3:7、4:6、5:5、6的Bi-Sb-膜玻璃碳电极(Bi-SbFEs) :4、7:3、8:2、9:1),并且在Bi(III)和Sb(III)的两种不同总质量浓度下,i。e。0.5和1.0 mg / L。在0.1 M醋酸盐缓冲溶液中,将这些Bi-SbFEs的分析性能与Bi-film(BiFE)和Sb-film(SbFE)电极进行了比较。Bi-SbFEs的所有组合均对Zn(II),Cd(II)和Pb(II)检测具有选择性。Bi-SbFEs的Zn(II),Cd(II)和Pb(II)的线性浓度范围比BiFE的宽得多。而且,与BiFE和SbFE相比,使用不同的Bi-SbFEs可以大大提高该方法的灵敏度。大多数Bi-SbFE方法都能为Cd(II)的测定提供令人满意的回收率,其中许多方法也可用于Pb(II),而对于Zn(II),只有少数方法提供的回收率值在80.0–120.0%的回收率范围内。对于Rb低于20.0%的Pb(II)和Cd(II),不同Bi-SbFEs的精度令人满意。积累时间的优化导致较低的LOD和LOQ,较高的灵敏度。最后,首次使用电化学阻抗谱来表征SbFE的电分析行为。后一分析用于比较纯BiFE和纯GCE的电极性能,并显示系统何时处于动力学和/或扩散控制过程中。积累时间的优化导致较低的LOD和LOQ,较高的灵敏度。最后,首次使用电化学阻抗谱来表征SbFE的电分析行为。后一分析用于比较纯BiFE和纯GCE的电极性能,并显示系统何时处于动力学和/或扩散控制过程中。积累时间的优化导致较低的LOD和LOQ,较高的灵敏度。最后,首次使用电化学阻抗谱来表征SbFE的电分析行为。后一分析用于比较纯BiFE和纯GCE的电极性能,并显示系统何时处于动力学和/或扩散控制过程中。
更新日期:2018-09-27
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