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首页> 外文期刊>International Journal of Electrochemical Science >Development of Electrochemical Sensor for Simultaneous Determination of Cd(II) and Hg(II) Ion by Exploiting Newly Synthesized Cyclic Dipeptide
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Development of Electrochemical Sensor for Simultaneous Determination of Cd(II) and Hg(II) Ion by Exploiting Newly Synthesized Cyclic Dipeptide

机译：利用新合成的环状二肽同时测定Cd（II）和Hg（II）离子的电化学传感器的开发

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摘要

An electrochemical sensor for simultaneous detection of Cd(II) and Hg(II) were developed by usingMWCNT/peptide modified Au electrode with cyclic voltammetry (CV). Peptides were synthesized bycyclooligomerisation of cysteine monomers in the presence of diphenylphosphoryl azide (DPPA). Thesynthesized peptides were attached to the Au electrode and the experimental conditions such aselectrochemical characterization, supporting electrolyte, pH and scan rates were optimized. Thedeveloped electrochemical sensor was found sensitive toward simultaneous determination of Cd(II)and Hg(II). The modified Au electrode were reproducible with R.S.D value of 2.25% and hadsignificantly superior analytical performance compared to the unmodified electrode. The slope value oflog Ip versus log v is 0.61.85 demonstrate that the modified Au electrode undergoes diffusion- adsorption controlled process. The sensitivity expressed as the slope of linear region of calibration-6 -1 -7 -1 curve was 6 10 Appm in borate buffer (pH 3) and 8 10 Appm in acetate buffer (pH 2). The-8 limit of detection (L.O.D) of Cd(II) is 2.749 10 M whereas the limit of detection of Hg(II) is 9.068-10 10 M. The developed electrochemical sensors were applied in real industrial waste water sample ofelectroplating industry and wood industry for simultaneous determination of Cd(II) and Hg(II). Theresults of the waste water sample analysis from the developed method showed a comparable resultwith the ICP-OES method.
机译：利用循环伏安法（MWV）/ MWCNT /肽修饰金电极开发了一种同时检测Cd（II）和Hg（II）的电化学传感器。在二苯基磷酰基叠氮化物（DPPA）存在下，通过半胱氨酸单体的环寡聚来合成肽。将合成的肽连接到金电极上，并优化了电化学表征，支持电解质，pH和扫描速率等实验条件。发现开发的电化学传感器对同时测定Cd（II）和Hg（II）敏感。与未修饰的电极相比，修饰的Au电极的R.S.D值可重现2.25％，并且具有显着优越的分析性能。 log Ip对log v的斜率值为0.61.85，表明修饰的Au电极经历了扩散吸附控制过程。用校准-6 -1 -7 -1曲线的线性区域的斜率表示的灵敏度在硼酸盐缓冲液（pH 3）中为6 10 Appm，在乙酸盐缓冲液（pH 2）中为8 10 Appm。 Cd（II）的-8检出限（LOD）为2.749 10 M，而Hg（II）的检出限为9.068-10 10M。木材工业中同时测定Cd（II）和Hg（II）所开发方法的废水样品分析结果与ICP-OES方法可比。

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