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Square Wave Voltammetry Measurements of Low Concentrations of Nitrate Using Au/AgNPs Electrode in Chloride Solutions
Electroanalysis ( IF 3 ) Pub Date : 2017-10-20 , DOI: 10.1002/elan.201700447
D. Chen Legrand 1 , C. Barus 1 , V. Garçon 1
Affiliation  

The aim of this work is to highlight the potential of using a modified gold electrode with controlled quantity of silver nanoparticles as a working electrode to detect low concentrations of nitrate in chloride solutions. Optimal charge for silver deposition has been determined to obtain the highest signal for the nitrate reduction as the electrocatalytic properties of the bimetallic electrode were directly influenced by its composition. According to the Volcano plot obtained the charge chosen was −52 μC for a 3 mm diameter electrode, corresponding to 4.6×1015 Ag atoms cm−2. It has been shown that dioxygen did not participate to the nitrate reduction mechanism. In order to decrease the limit of quantification, square wave voltammetry was preferred to less sensitive cyclic voltammetry. Nitrate was quantified in chloride solutions in the concentration range found in the open ocean, i. e. 0.39–50 μmol L−1 with a good linear regression (R2=0.9969). The stability of the bimetallic Au−Ag systems has been evaluated and showed almost no difference on the signal recorded over a 26 days period which is suitable to consider an in situ sensor development for marine applications.

中文翻译:

在氯化物溶液中使用 Au/AgNPs 电极测量低浓度硝酸盐的方波伏安法

这项工作的目的是强调使用具有受控数量的银纳米粒子的改性金电极作为工作电极来检测氯化物溶液中低浓度硝酸盐的潜力。已确定银沉积的最佳电荷以获得硝酸盐还原的最高信号,因为双金属电极的电催化性能直接受其组成的影响。根据获得的火山图,对于直径为 3 mm 的电极,选择的电荷为 -52 μC,对应于 4.6×1015 Ag 原子 cm-2。已经表明分子氧不参与硝酸盐还原机制。为了降低定量限,方波伏安法优于灵敏度较低的循环伏安法。在开放海洋中发现的浓度范围内的氯化物溶液中量化硝酸盐,即。e. 0.39–50 μmol L-1 具有良好的线性回归 (R2=0.9969)。双金属 Au-Ag 系统的稳定性已经过评估,在 26 天的时间内记录的信号几乎没有差异,这适合考虑用于海洋应用的原位传感器开发。
更新日期:2017-10-20
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