邻苯二酚在多壁碳纳米管修饰玻碳电极上的电化学行为及其测定  

Electrochemical Behavior of Catechol and Its Determination at Multi-wall Carbon Nanotubes Modified Glassy Carbon Electrode

作　　者：高迎春[1] 陈金龙[1] 方宾[2] 徐志兵[1] 王张健[1] 

机构地区：[1]安庆师范学院化学化工学院,安庆246011 [2]安徽师范大学化学与材料科学学院,芜湖241000

出　　处：《理化检验（化学分册）》2009年第5期540-542,545,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：安徽省高等学校青年教师资助计划项目(2005jq114);安徽省教育厅科研项目(2006kj024c)

摘　　要：叙述了多壁碳纳米管修饰玻碳电极的制备方法，多壁碳纳米管用前需经硫酸-硝酸（3＋1）混合酸预处理以增强其反应活性。与裸玻碳电极相比，多壁碳纳米管修饰电极具有更高的氧化还原峰电流和更低的氧化电位。试验优化了支持电解质、pH值、扫描速率等测定条件，此法测定邻苯二酚的线性范围为4．0×10^-7～8．0×10^-5mol·L^-1，检出限（3S／N）为6．0×10^-8mol·L^-1应用于模拟水样中邻苯二酚的测定。在4个浓度水平上用标准加入法作了回收试验，测得其回收率在99．2％～103．0％之间，相对标准偏差（n=8）均小于3．5％。Method of preparation of multi-wall carbon nanotubes （MWCNT＇ s） modified glassy carbon electrode （GCE） was described, and the MWCNT＇s modified GCE obtained was pretreated with mixed acid of H2SO4 and HNO3 （3 ＋ 1） to enhance its reaction activity. As compared with bare GCE, the MWCNT＇s modified electrode behaved to be significantly enhanced with its redox peak current and to have lower oxidation potential. Under the optimized reaction conditions [i. e. the supporting electrolyte, acidity （pH values） of the reaction medium, scanning rate and etc. ], linear relationship between values of peak current and concentration of catechol was kept in the range of 4.0 × 10^-7 -8. 0× 10^-5 mol·L^-1, with it detection limit （3S/N） of 6.0 × 10^-8 mol · L^-1 A simulated water sample was analyzed by the proposed method for its cateehol contents and recovery were tested by addition of standard eatechol solution at 4 different concentration levels, giving values of recovery in the range of 99. 2%-103.0% with RSD＇s （n=8） less than 3. 5%.

关 键 词：多壁碳纳米管 化学修饰电极 邻苯二酚 

分 类 号：O657.31[理学—分析化学]