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Electrochemical Determination of Arsenic Using Silver Nanoparticles
Electroanalysis ( IF 2.7 ) Pub Date : 2018-09-21 , DOI: 10.1002/elan.201800520 Baudelaire Matangouo Sonkoue 1 , Patrick Marcel Seumo Tchekwagep 1 , Charles Péguy Nanseu-Njiki 1 , Emmanuel Ngameni 1
Electroanalysis ( IF 2.7 ) Pub Date : 2018-09-21 , DOI: 10.1002/elan.201800520 Baudelaire Matangouo Sonkoue 1 , Patrick Marcel Seumo Tchekwagep 1 , Charles Péguy Nanseu-Njiki 1 , Emmanuel Ngameni 1
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In the present work, silver colloid was produced by chemical reduction of silver salt (silver nitrate) using citrates in aqueous solution. UV‐Vis spectrophotometry indicated the formation of nanoparticles. The surface plasmon resonance peak in absorption spectra of the silver colloidal solution showed an absorption maximum at 435 nm. The dynamic light scattering and zeta potential measurements showed that the size and the zeta potential of the synthesized nanoparticles were about 98 nm and −50 mV respectively. The nanoparticles have been used to modify the gold electrode for use as a potential electrochemical sensor for the analysis of arsenic in aqueous solution. The cyclic voltammogram recorded using gold electrode modified with AgNPs depicted a well‐defined reduction peak of arsenic compared to bare gold electrode. The enhancement of the signal is essentially due to the large surface area attributed to silver nanoparticles. Linear sweep voltammetry has been used to optimize the analytical conditions of arsenic in aqueous solution: it came out that the detection of arsenic in 0.1 M HNO3 was optimal while the electrode was conditioned at −0.6 v during 300 s. Under these optimum conditions, a calibration curve was plotted in the concentration range of 0.05 μM to 0.2 μM and the detection limit was estimated at 1.38×10−8 M, calculated from a ratio signal/noise 3.
中文翻译：
银纳米粒子电化学测定砷
在本工作中，胶体银是通过使用水溶液中的柠檬酸盐对银盐（硝酸银）进行化学还原而制得的。紫外可见分光光度法表明形成了纳米颗粒。银胶体溶液的吸收光谱中的表面等离子体激元共振峰在435nm处显示最大吸收。动态光散射和ζ电势测量表明，合成的纳米颗粒的尺寸和ζ电势分别为约98nm和-50mV。纳米粒子已被用于修饰金电极，用作分析水溶液中砷的潜在电化学传感器。使用AgNPs修饰的金电极记录的循环伏安图显示了与裸金电极相比砷的明确定义的还原峰。信号的增强主要归因于银纳米颗粒的大表面积。线性扫描伏安法已用于优化水溶液中砷的分析条件：结果表明，在0.1 M HNO中检测砷在300 s内将电极调至-0.6 v时，3最佳。在这些最佳条件下，在0.05μM至0.2μM的浓度范围内绘制校准曲线，并 根据信噪比3计算得出检测限为1.38×10 -8 M.
更新日期：2018-09-21
中文翻译：
银纳米粒子电化学测定砷
在本工作中，胶体银是通过使用水溶液中的柠檬酸盐对银盐（硝酸银）进行化学还原而制得的。紫外可见分光光度法表明形成了纳米颗粒。银胶体溶液的吸收光谱中的表面等离子体激元共振峰在435nm处显示最大吸收。动态光散射和ζ电势测量表明，合成的纳米颗粒的尺寸和ζ电势分别为约98nm和-50mV。纳米粒子已被用于修饰金电极，用作分析水溶液中砷的潜在电化学传感器。使用AgNPs修饰的金电极记录的循环伏安图显示了与裸金电极相比砷的明确定义的还原峰。信号的增强主要归因于银纳米颗粒的大表面积。线性扫描伏安法已用于优化水溶液中砷的分析条件：结果表明，在0.1 M HNO中检测砷在300 s内将电极调至-0.6 v时，3最佳。在这些最佳条件下，在0.05μM至0.2μM的浓度范围内绘制校准曲线，并 根据信噪比3计算得出检测限为1.38×10 -8 M.
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