Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry,Electroanalysis

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Nanoporous Gold Microelectrode: A Novel Sensing Platform for Highly Sensitive and Selective Determination of Arsenic (III) using Anodic Stripping Voltammetry
Electroanalysis ( IF 2.7 ) Pub Date : 2017-07-18 , DOI: 10.1002/elan.201700301
Darío Xavier Orellana Jaramillo _{1,

2} , Anandhakumar Sukeri ₁ , Lucas P.H. Saravia ₁ , Patricio Javier Espinoza-Montero ₂ , Mauro Bertotti ₁

Affiliation

A home‐made gold microelectrode (Au‐μE) was fabricated and its surface was modified with nanoporous gold structures via a facile electrochemical approach (anodization followed by electrochemical reduction method). The fabricated nanoporous Au microelectrode (NPG‐μE) was used as a sensor probe for the determination of As(III) in 1.0 mol L⁻¹ HCl solution using square wave anodic stripping voltammetry (SWASV) technique. Field emission scanning electron microscopy (FE‐SEM) and cyclic voltammetry were used to characterize the surface morphology and assess the electrochemical surface area and the roughness factor of the NPG‐μE. SWASVs recorded with the NPG‐μE in As(III) solutions indicated linear behaviour in the concentration ranges of 10–200 μg L⁻¹ and 2–30 μg L⁻¹, with regression coefficients of 0.996 and 0.999 at a deposition time of 120 s, respectively. The limit of detection (LOD) was found to be 0.62 μg L⁻¹ with high sensitivity of 29.75 μA (μg L⁻¹)⁻¹ cm⁻². Repeatability and reproducibility were also examined and values were determined as 3.2 % and 9.0 %. Negligible interference from major interfering copper ion was noticed, revealing the excellent anti‐interference property of the proposed sensing platform. The developed NPG‐μE was successfully used for As(III) determination in tap water samples.

中文翻译：

纳米多孔金微电极：使用阳极溶出伏安法高灵敏度和选择性地测定砷（III）的新型传感平台

制作了一个自制的金微电极（Au-E），并通过一种简便的电化学方法（阳极氧化，然后采用电化学还原方法）对其表面进行了纳米孔金结构的修饰。使用方波阳极溶出伏安法（SWASV），将制成的纳米多孔金微电极（NPG-μE）用作传感器探针，用于测定1.0 mol L ^-1 HCl溶液中的As（III）。场发射扫描电子显微镜（FE‐SEM）和循环伏安法用于表征表面形态，并评估NPG‐μE的电化学表面积和粗糙度因子。在作为（III）溶液与NPG-μE记录SWASVs在10-200微克L中的浓度范围所指示的线性特性^-1和2-30微克大号^-1，在120 s的沉积时间分别具有0.996和0.999的回归系数。发现检测限（LOD）为0.62μgL ^-1，具有29.75μA（μgL ^-1）^-1 cm ^-2的高灵敏度。还检查了重复性和可重复性，并将其值确定为3.2％和9.0％。注意到主要干扰铜离子产生的干扰可忽略不计，这表明所提出的传感平台具有出色的抗干扰性能。研发的NPG-μE已成功用于自来水样品中As（III）的测定。

更新日期：2017-07-18

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