直接电沉积金纳米粒子修饰氧化铟锡电极测定亚硝酸根  

Determination of Nitrite at Gold Nanoparticles Modified Indium Tin Oxide Electrode with Direct Electrodeposition

作　　者：赵美莲[1] 倪丹丹[1] 王建文[1] 狄俊伟[1] 屠一锋[1] 

机构地区：[1]苏州大学化学化工学院,苏州215123

出　　处：《分析化学》2008年第12期1729-1731,共3页Chinese Journal of Analytical Chemistry

基　　金：江苏省教育厅自然科学基金(No.07KJB150101)资助项目

摘　　要：以电化学沉积法一步制得了金纳米粒子（GNP）修饰氧化铟锡（ITO）电极，采用紫外、扫描电镜及循环伏安法对GNP／ITO修饰电极进行了表征。结果表明，金纳米粒子在ITO电极表面呈球形，分布均匀无团聚，粒径约30nm。该修饰电极具有良好的电化学性能，在pH2．2的Na2HPO4-柠檬酸缓冲溶液中其氧化峰电流与NO2^-的浓度呈良好的线性关系，线性范围为5×10^-6～5．5×10^-4mol／L，线性回归方程为：i（μA）=1.07＋136C（mmol／L），相关系数r=0．9969；检出限可达1．0×10^-6mol／L。该修饰电极用于废水中NO2^-的测定，结果令人满意。A one-step method for the electrodeposition fabrication of gold nanoparticles （GNP） modified indium tin oxide （ITO） electrode was investigated. The GNP/ITO modified electrode was characterized by UV-Vis spectroscopy, SEM and electrochemical methods. The results show that the gold nanopartieles on the ITO electrode surface are quite symmetric distribution with a quasi-spherical shape and the average diameter is about 30 nm. It is found that the modified electrode has obvious electroactivity on nitrite in phosphate-citrate buffer solution （pH 2.2）. The anodic current of nitrite vs its concentration has good linear relation in the range of 5×10^-6～5.5×10^-4mol/L. The linear regression equation is i（μA） = 1.07 ＋ 136C（ retooL/L）, r =0.9969 and the detection limit is 1.0×10^-6mol/L. The results were satisfactory when the modified electrode was applied for the determination of nitrite in wastewater.

关 键 词：电化学沉积 金纳米粒子 亚硝酸根 氧化铟锡电极 化学修饰电极 

分 类 号：X832[环境科学与工程—环境工程]