阳极溶出伏安法
镉
水溶液中的金属离子
电化学
化学
Mercury(编程语言)
电极
检出限
金属
螯合作用
分析化学(期刊)
离子
无机化学
核化学
色谱法
物理化学
有机化学
计算机科学
程序设计语言
作者
Bhagwan Singh Chandravanshi,Endale Tesfaye,Negussie Negash,Merid Tessema
标识
DOI:10.1002/elan.202300022
摘要
Abstract A novel modified carbon paste electrode has been developed using a laboratory synthesized metal chelating ligand (L), N 1 ‐hydroxy‐N 1 ,N 2 ‐diphenylbenzamidine (HDPBA) and multi‐walled carbon nanotubes (MWCNTs) composite (L‐MWCNTs/CPE). The developed modified electrode was applied for selective and sensitive simultaneous electrochemical determination of cadmium(II), lead(II), and mercury(II) using square wave anodic stripping voltammetry (SWASV). The accumulation of metal ions on the electrode surface was performed in 0.1 M acetate buffer solution (ABS, pH 5.0) by applying a potential of–1.10 V versus Ag/AgCl for 210 s, followed by stripping in the positive potential scan of the SWASV after a rest time of 10 s. Under the optimum experimental conditions, the linear dynamic ranges were found to be 2×10 −4 –2, 1×10 −4 –2 and 2×10 −3 –2 μM of cadmium(II), lead(II), and mercury(II), respectively, with the detection limits (LODs) of 2.5×10 −2 , 7.8×10 −3 and 4.6×10 −1 nM for cadmium(II), lead(II), and mercury(II), respectively. The proposed electrode exhibited high sensitivity for the determination of these metal ions with excellent reproducibility and stability. The influence of several ions on the simultaneous determination of Cd(II), Pb(II), and Hg(II) was studied, and the prepared electrode was found to be highly selective for the detection of the three metal ions. The developed electrode was effectively applied to the determination of the three metal ions in water, vegetable and tobacco samples, and the obtained results were similar to those measured with graphite furnace atomic absorption spectrometry (GFAAS).
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