纳米氧化铁修饰玻碳电极上亚硝酸根的电化学测定  

Electrochemical Determination of Nitrite on Ferromagnetic Iron Oxide Nanoparticles Modified Electrode

作　　者：周莹[1] 黄广君[1] 卢晓童 张鹏 Zhou Ying;Huang Guangjun;Lu Xiaotong;Zhang Peng(Nanning University,Nanning 530200,China)

机构地区：[1]南宁学院,广西南宁530200

出　　处：《山东化工》2023年第6期105-107,共3页Shandong Chemical Industry

基　　金：2019年度广西高校中青年教师基础能力提升项目(2019KY0946)。

摘　　要：在室温下将磁性纳米氧化铁粒子(γ-Fe_(2)O_(3))修饰于玻碳电极表面,制得了测定亚硝酸根(NO_(2)^(-))的电化学传感器(γ-Fe_(2)O_(3)/GCE)。在pH值4.8的0.2 mol·L^(-1)HAc-NaAc缓冲溶液中,修饰电极对NO_(2)^(-)具有催化和增敏明显增强。峰电位由1.06 V(裸电极)负移到0.96 V(修饰电极),灵敏度增加1.5倍。峰电流I与CNO_(2)^(-)在一定范围内呈现线性关系,浓度范围为6.0×10^(-6)~1.0×10^(-2)mol·L^(-1),对应检测限为4.0×10^(-6)mol·L^(-1)。研究NO_(2)^(-)在该修饰电极上的电化学机理,方法用于样品中亚硝酸根的测定,回收率在101.0%~104.8%。A new method for the determination of nitrite was established based on ferromagnetic iron oxide nanoparticles(γ-Fe_(2)O_(3))modified glassy carbon electrode(γ-Fe_(2)O_(3)/GCE).In pH 4.8,0.2 mol·L^(-1) HAc-NaAc buffer solution,the modified electrode significantly enhanced the catalytic and sensitization of NO_(2)^(-).The peak potential shifted negatively from 1.06 V(bare electrode)to 0.96 V(modified electrode),and the sensitivity increased by 1.5 times.The peak current I and C NO_(2)^(-)show a linear relationship within a certain range,and the concentration ranges from 6.0×10^(-6) to 1.0×10^(-2) mol·L^(-1),corresponding to the detection limit of 4.0×10^(-6) mol·L^(-1).The electrochemical mechanism of NO_(2)^(-)on the modified electrode was studied.The method was used for the determination of nitrite with the recovery of 101.0%~104.8%.

关 键 词：亚硝酸根 纳米氧化铁 修饰电极 电化学机理 

分 类 号：O657.1[理学—分析化学]