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首页> 外文期刊>Electroanalysis >Pf-Nanoparticle Incorporated Carbon Paste Electrode for the Determination of Cu(II) Ion by Anodic Stripping Voltammetry
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Pf-Nanoparticle Incorporated Carbon Paste Electrode for the Determination of Cu(II) Ion by Anodic Stripping Voltammetry

机译：阳极溶出伏安法测定Pf-纳米粒子掺碳糊电极法测定Cu（II）离子

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摘要

Pt-nanoparticles were synthesized and introduced into a carbon paste electrode (CPE), and the resulting modified electrode was applied lo the anodic stripping voltammetry of copper(II) ions. The synthesized Pt-nanoparticles were characterized by cyclic voltammetry, scanning electron microscopy and X-ray photoelectron spectroscopy techniques lo confirm the purity and the size of the prepared Pt-nanoparticles (ca. 20 nm). This incorporated material seems to act as catalysts with preconcentration sites for copper(II) species that enhances the sensitivity of Cu(II) ions to Cu(I) species at a deposition potential of -0.6 V in an aqueous solution. The experimental conditions, such as, the electrode composition, pH of the solution, pre-concentration time, were optimized for the determination of Cu(II) ion using as-prepared electrode. The sensitivity changes on the different binder materials and the presence of surfactants in the test solution. The interference effect of the coexisted metals were also investigated. In the presence of surfactants, especially TritonX-100, the Cu(II) detection limit was lowered to 3.9 x l(TlJ M. However, the Pt-nanoparticle modified CPE begins to degrade when the period of deposition exceeds to 10 min. Linear response for copper(II) was found in the concentration range between 3.9 x 10"" M and 1.6 x 10f'M, with an estimated detection limit of 1.6xl0^M (1.0 ppb) and relative standard deviation was 4.2% (/; = 5).
机译：合成了Pt纳米粒子，并将其引入碳糊电极（CPE）中，并将所得修饰电极应用于铜（II）离子的阳极溶出伏安法。通过循环伏安法，扫描电子显微镜和X射线光电子能谱技术对合成的Pt纳米颗粒进行了表征，从而证实了所制备的Pt纳米颗粒的纯度和尺寸（约20 nm）。这种掺入的材料似乎充当具有预浓缩位的铜（II）物种的催化剂，在水溶液中的沉积电势为-0.6 V时，可增强Cu（II）离子对Cu（I）物种的敏感性。优化了实验条件，例如电极组成，溶液的pH值，预浓缩时间，以便使用准备好的电极测定Cu（II）离子。在不同的粘合剂材料和测试溶液中表面活性剂的存在下，灵敏度会发生变化。还研究了共存金属的干扰效应。在存在表面活性剂（尤其是TritonX-100）的情况下，Cu（II）的检出限降低到3.9 xl（TlM）。但是，当沉积时间超过10分钟时，Pt纳米粒子改性的CPE开始降解。铜（II）的浓度范围为3.9 x 10“” M和1.6 x 10f'M，估计检出限为1.6x10 ^ M（1.0 ppb），相对标准偏差为4.2％（/; = 5）。

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