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首页> 外文期刊>International journal of environmental analytical chemistry >Cadmium determination in phosphate fertiliser using a PAN-Nafion~® modified glassy carbon electrode by stripping voltammetry
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Cadmium determination in phosphate fertiliser using a PAN-Nafion~® modified glassy carbon electrode by stripping voltammetry

机译：PAN-Nafion〜®修饰玻碳电极通过溶出伏安法测定磷酸盐肥料中的镉

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摘要

A simple method for the determination of trace cadmium (Cd) (II), using a disposable l-(2-pyridylazo)-2-naphthol [PAN]-Nafion®-coated glassy carbon electrode, has been developed. The modified electrode exhibited a significant improvement on both sensitivity and selectivity for Cd (II) determination, compared with a bare glassy carbon electrode (GCE), a PAN-coated GCE (PAN-GCE), and a Nafion®-coated GCE (Nafion® GCE). Differential pulse anodic stripping voltammetry (DPASV) was performed, in 0.05 M potassium hydrogen phthalate (KHP) buffer medium, after Cd (II) ion accumulation. The Cd(II) ion accumulated on the PAN-Nafion® surface of the glassy carbon working electrode through the formation of a chemical complex at an open circuit. The modified GCE with Cd (II) complex was then transferred to a 0.1 M KI solution and subjected to an electrochemical stripping procedure. Cyclic voltammetry (CV) was employed to confirm the successful stepwise assembly procedure for the modified electrode. The structure of PAN-Nafion® on the surface-modified electrode was characterised by scanning electron microscopy (SEM). System variables were optimised to yield the most suitable conditions, including the pH and concentration of the accumulation medium, deposition potential, deposition time, and amount of coated PAN-Nafion®. The quantitative analysis of contaminated cadmium in phosphate fertiliser samples was performed. The results obtained from the proposed method agree well with those obtained by inductively coupled plasma-optical emission spectrophotome'try (ICP-OES).
机译：开发了一种使用一次性的1-（2-吡啶基偶氮）-2-萘酚[PAN]-Nafion®涂层的玻璃碳电极测定痕量镉（II）的简单方法。与裸玻碳电极（GCE），PAN涂层GCE（PAN-GCE）和Nafion®涂层GCE（Nafion）相比，修饰电极对Cd（II）测定的灵敏度和选择性都有显着提高。 ®GCE）。 Cd（II）离子积累后，在0.05 M邻苯二甲酸氢钾（KHP）缓冲液中进行差分脉冲阳极溶出伏安法（DPASV）。通过在开路处形成化学络合物，Cd（II）离子会积聚在玻璃碳工作电极的PAN-Nafion®表面上。然后将具有Cd（II）配合物的改性GCE转移到0.1 M KI溶液中，并进行电化学汽提程序。循环伏安法（CV）用于确认修饰电极成功的逐步组装程序。表面修饰电极上的PAN-Nafion®结构通过扫描电子显微镜（SEM）表征。优化系统变量以产生最合适的条件，包括pH和累积培养基的浓度，沉积电位，沉积时间和包被PAN-Nafion®的量。进行了磷肥样品中污染镉的定量分析。从提出的方法获得的结果与通过电感耦合等离子体发射光谱法（ICP-OES）获得的结果非常吻合。

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