Dual detection of nitrate and mercury in water using disposable electrochemical sensors
Dual detection of nitrate and mercury in water using disposable electrochemical sensors
复制标题
DOI：
10.1016/j.bios.2016.05.017
复制
发表时间：
2016-11-15
影响因子：
12.6
通讯作者：
Abbas, Abdennour
中科院分区：
文献类型：
--
作者：
Bui, Minh-Phuong N.;Brockgreitens, John;Abbas, Abdennour
在这里，我们报告了一种一次性的、成本效益高的电化学纸基传感器，用于检测湖水和受污染的农业径流中的硝酸盐和汞离子。用硒颗粒(SEP)和金纳米颗粒(AuNPs)对一次性碳纸电极进行功能化处理。用差示脉冲伏安法研究了金纳米粒子对硝酸根离子还原的催化作用。AUNPs也是汞离子的成核中心。由于其与汞的高结合亲和力，SEPS进一步加强了这种汞离子成核作用。采用差示脉冲溶出伏安法进一步提高了汞离子在修饰电极上的积累。用扫描电子显微镜、能量色散X射线能谱和电化学技术对电极进行了表征。结果表明，聚乙二醇-SH/SEPS/AuNPs修饰碳纸电极具有双重功能，可以在不干扰的情况下同时检测硝酸根和汞离子。修饰后的碳纸电极提高了硝酸根离子和汞离子的分析灵敏度，检出限分别为8.6微米和1.0 ppb。最后，将修饰电极用于湖水中硝酸盐和汞的测定。(C)2016爱思唯尔B.V.保留所有权利。
Here we report a disposable, cost effective electrochemical paper-based sensor for the detection of both nitrate and mercury ions in lake water and contaminated agricultural runoff. Disposable carbon paper electrodes were functionalized with selenium particles (SePs) and gold nanoparticles (AuNPs). The AuNPs served as a catalyst for the reduction of nitrate ions using differential pulse voltammetry techniques. The AuNPs also served as a nucleation sites for mercury ions. The SePs further reinforced this mercury ion nucleation due to their high binding affinity to mercury. Differential pulse stripping voltammetry techniques were used to further enhance mercury ion accumulation on the modified electrode. The fabricated electrode was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electrochemistry techniques. The obtained results show that the PEG-SH/SePs/AuNPs modified carbon paper electrode has a dual functionality in that it can detect both nitrate and mercury ions without any interference. The modified carbon paper electrode has improved the analytical sensitivity of nitrate and mercury ions with limits of detection of 8.6 mu M and 1.0 ppb, respectively. Finally, the modified electrode was used to measure nitrate and mercury in lake water samples. (C) 2016 Elsevier B.V. All rights reserved.