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首页> 外文期刊>Electrochimica Acta >Determination of picomolar silver concentrations by differential pulse anodic stripping voltammetry at a carbon paste electrode modified with phenylthiourea-functionalized high ordered nanoporous silica gel
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Determination of picomolar silver concentrations by differential pulse anodic stripping voltammetry at a carbon paste electrode modified with phenylthiourea-functionalized high ordered nanoporous silica gel

机译：在苯硫脲官能化的高阶纳米多孔硅胶修饰的碳糊电极上通过差分脉冲阳极溶出伏安法测定皮摩尔银浓度

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摘要

This study introduces the design of an anodic stripping voltammetric (ASV) method for the silver ion determination at a carbon paste electrode (CPE), chemically modified with phenylthiourea-nanoporous silica gel (Tu-SBA-15-CPE). The electroanalytical pro includes two steps: preconcentration of metal ions at an electrode surface, followed by quantification of the accumulated species by differential pulse anodic stripping voltammetric methods. Factors affecting the performance of the anodic stripping were investigated, including the modifier quantity in the paste, the electrolyte concentrations, the solution pH and the accumulation potential or time. The most sensitive and reliable electrode contained 10%Tu-SBA-15 and 90% carbon paste. The accumulation potential and time were set at, -200 mV and 300 s, respectively, and the scan rate at 50 mV s~(-1) in the scan range of -200 to 700 mV. The resulting electrode demonstrated a linear response over range of silver ion concentration of 8.0-80 pmol/L with detection limit (S/N = 3) of 5 pmol/L. The prepared electrodes were used for the silver determination in sea and tap water samples and very good recovery results were obtained. The accuracy was assessed through recovery experiments and independent analysis by graphite furnace atomic absorption spectrometry.
机译：这项研究介绍了一种阳极溶出伏安法（ASV）的方法，该方法用于在碳糊电极（CPE）上测定银离子，并用苯硫脲-纳米多孔硅胶（Tu-SBA-15-CPE）化学修饰。电分析仪包括两个步骤：在电极表面预浓缩金属离子，然后通过差分脉冲阳极溶出伏安法对累积的物种进行定量。研究了影响阳极剥离性能的因素，包括浆料中的改性剂数量，电解质浓度，溶液的pH值以及累积电势或时间。最敏感，最可靠的电极包含10％Tu-SBA-15和90％碳糊。累积电位和时间分别设置为-200 mV和300 s，扫描速率在-200至700 mV的扫描范围内为50 mV s〜（-1）。所得电极在8.0-80 pmol / L的银离子浓度范围内显示线性响应，检测极限（S / N = 3）为5 pmol / L。所制备的电极用于海水和自来水样品中的银的测定，并获得了很好的回收率结果。通过回收率实验和石墨炉原子吸收光谱法的独立分析来评估准确性。

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