Simultaneous Electrochemical Detection of Co(II) and Cu(II) by 1-Diazo-2-Naphthol-4-Sulfonic Acid/MWCNTs Modified Electrode,Electroanalysis

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Simultaneous Electrochemical Detection of Co(II) and Cu(II) by 1-Diazo-2-Naphthol-4-Sulfonic Acid/MWCNTs Modified Electrode
Electroanalysis ( IF 2.7 ) Pub Date : 2017-07-19 , DOI: 10.1002/elan.201700237
Muhammad Zamhari _{1,

2,

3} , Apon Numnuam _{1,

2,

3} , Warakorn Limbut _{1,

2,

4} , Proespichaya Kanatharana _{1,

2,

3} , Panote Thavarungkul _{1,

2,

5}

Affiliation

This work describes a simple preparation of 1-diazo-2-naphthol-4-sulfonic acid (1,2,4-acid) and multiwalled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) for the simultaneous detection of Co(II) and Cu(II). MWCNTs, with their good conductivity and large surface area, were drop-casted onto the surface of the GCE prior to the electrodeposition of 1,2,4-acid, a metal chelating agent. Co(II) and Cu(II) were simultaneously measured by differential pulse anodic stripping voltammetry (DPASV) in a batch system. Under optimum conditions, the linear range of Co(II) was between 0.10 and 2.5 μg mL−1 with an LOD of 80 ng mL−1. Two linear ranges were obtained for Cu(II), 0.0050 to 0.030 μg mL−1 and 0.040 to 0.25 μg mL−1,with an LOD of 2.4 ng mL−1. The method offered a high operational stability for up to 52 measurements (RSD=3.4 % for Co(II) and 2.6 % for Cu(II)) and good reproducibility (RSD=1.2 % for Co(II) and 1.7 % for Cu(II)). In the simultaneous detection of Co(II) and Cu(II), there was no effect from common interferences found in wastewater. The method was successfully applied in real water samples with good recoveries (88.2±0.8 to 102.0±0.8 % for Co(II) and 96.5±0.4 to 103.8±0.9 % for Cu(II)) and the results were in good agreement with those obtained from inductively coupled plasma optical emission spectrometry (ICP-OES) (P>0.05).

中文翻译：

1-重氮-2-萘酚-4-磺酸/多壁碳纳米管修饰电极同时电化学检测Co(II)和Cu(II)

这项工作描述了 1-重氮-2-萘酚-4-磺酸（1,2,4-酸）和多壁碳纳米管 (MWCNTs) 修饰的玻碳电极 (GCE) 的简单制备，用于同时检测 Co(II) ) 和 Cu(II)。在电沉积 1,2,4-酸（一种金属螯合剂）之前，将具有良好导电性和大表面积的 MWCNT 滴铸到 GCE 表面。Co(II) 和 Cu(II) 在分批系统中通过差分脉冲阳极溶出伏安法 (DPASV) 同时测量。在最佳条件下，Co(II) 的线性范围介于 0.10 和 2.5 μg mL-1 之间，LOD 为 80 ng mL-1。Cu(II) 获得两个线性范围，0.0050 至 0.030 μg mL-1 和 0.040 至 0.25 μg mL-1，LOD 为 2.4 ng mL-1。该方法提供了高达 52 次测量的高操作稳定性 (RSD=3. Co(II) 为 4%，Cu(II) 为 2.6%）和良好的重现性（Co(II) 的 RSD=1.2%，Cu(II) 的 RSD=1.7%）。在同时检测 Co(II) 和 Cu(II) 时，废水中发现的常见干扰没有影响。该方法成功应用于实际水样中，回收率良好（Co(II) 为 88.2±0.8 至 102.0±0.8 %，Cu(II) 为 96.5±0.4 至 103.8±0.9 %），结果与这些结果吻合良好电感耦合等离子体发射光谱法 (ICP-OES) (P>0.05)。

更新日期：2017-07-19

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