多壁碳纳米管修饰金电极测定维生素B_(12)  

Determination of vitamin B_(12) at multi-wall carbon nanotubes film modified gold electrode

作　　者：向伟[1] 李将渊[1] 马曾燕[1] 

机构地区：[1]西华师范大学化学化工学院,四川南充637002

出　　处：《化学研究与应用》2007年第6期710-712,716,共4页Chemical Research and Application

基　　金：四川省教育厅重点科研项目(2004A106)资助

摘　　要：Prepare multi-wall carbon nanotubes modifying gold electrode(MWCNT/Au) and study this electrode electrocatalytic action to vitamin B12(VB12) and determining analytic condition of VB12 in the solution.In the mixture of 0.1 mol/L KCl as supporting electrolyte and phosphatic buffer solution(pH 7.0),a sensitive reduction peak of VB12 on MWCNT/Au was obtained by cyclic voltammetry.The potential peak for VB12 is-0.120V(vs.SCE).And the reduction peak currents of linear sweep voltammetry are linearly related to the concentration of VB12 in the range of 5×10-5mol/L～5×10-6 mol/L and 1×10-6mol/L～5×10-8 mol/L and the detect limit can reach 1.0×10-8 mol/L.This electrode has been applied to the direct determination of VB12 in sample with a recovery of 95.5%～108.5%.Prepare multi-wall carbon nanotubes modifying gold electrode （MWCNT/Au） and study this electrode electrocatalytic action to vitamin B12 （ VB12 ） and determining analytic condition of VB12 in the solution. In the mixture of 0. 1 mol/L KCl as supporting electrolyte and phosphatic buffer solution（ pH 7.0）, a sensitive reduction peak of VB12 on MWCNT/Au was obtained by cyclic voliammetry. The potential peak for VB12 is 4）. 120V （vs. SCE）. And the reduction peak currents of linear sweep vohammetry are linearly related to the concentration of VB12 in the range of 5 ×10^-5 mol/L ～ 5 × 10^-6 mol/L and 1 × 10^-6 mol/L ～ 5 × 10^-8 mol/L and the detect limit can reach 1.0 × 10^-8 mol/L. This electrode has been applied to the direct determination of VB12 in sample with a recovery of 95.5% ～ 108.5%.

关 键 词：维生素B12 多壁碳纳米管 修饰电极 伏安测定 

分 类 号：O646.5[理学—物理化学]