亚硝酸盐
电极
检出限
胶体金
碳纳米管
扫描电子显微镜
碳糊电极
材料科学
纳米颗粒
碳纤维
分析化学(期刊)
化学工程
核化学
化学
纳米技术
无机化学
电化学
循环伏安法
色谱法
复合材料
有机化学
物理化学
硝酸盐
复合数
工程类
作者
Abbas Afkhami,Farzaneh Soltani-Felehgari,Tayyebeh Madrakian,Hamed Ghaedi
标识
DOI:10.1016/j.bios.2013.07.056
摘要
In this paper, a highly sensitive and selective voltammetric sensor for the determination of nitrite is proposed. We described a fast and easy method for the fabrication of gold nanoparticles/multi-walled carbon nanotube/carbon paste electrode (GNPs /MWCPE) by one-step electrodeposition under controlled potential, the whole procedure takes only several minutes. Scanning electron microscopy (SEM) image demonstrated that the gold nanoparticles deposited on MWCNTs/CPE were uniform, with an average size of 30 nm. By combining the benefits of GNPs/MWCNTs and CPE, the resulted modified electrode exhibited outstanding electrocatalytic activity in terms of nitrite oxidation by giving much higher peak currents than those found for the unmodified CPE and also the MWCNTs-modified electrode. The effect of various experimental parameters on the voltammetric response of nitrite was investigated. At the optimum conditions the sensor has a linear response in the 0.05-250.0 µmol L(-1) concentration range, a very good detection sensitivity (0.4177 μA L µmol(-1)), and a low detection limit of 1×10(-2) μmol L(-1) of nitrite. Most common ions and many environmental organic pollutants do not interfere. The proposed chemically modified electrode was used to the determination of NO2(-) in several foodstuffs and water samples and the results were found to be consistent with the values obtained by the Griess protocol.
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