摘要
制备了聚磷钼西免／乙炔黑修饰电极（PMA／AB／GCE），用循环伏安法（CV）研究了乙萘酚（EN）在该电极上的循环伏安行为。在pH5．5的HAc—NaAc缓冲液中，EN在该修饰电极上出现一明显的氧化峰。在60—300mV／s扫速范围内，其氧化峰电流（IPa）与扫速平方根（v1/2）呈线性关系，表明该电极过程是受扩散控制的不可逆过程。计算电极过程的部分动力学参数：电极有效面积为0．122cm2，质子数与电子数均为l，扩散系数为D为9．64×10^-5cm2／s。运用方波伏安法测定不同浓度EN的方波伏安曲线，结果表明氧化峰电流与EN浓度在9．0×10～-1．0×10-mol／L范围内呈良好线性关系（r=0．992），检出限（S／N=3）为6．35×10^-7mol／L，加标回收率为92．8％-102．8％。
A new biosensor was fabricated by the electrochemical polymerization of phosphomolybdic acid （PMA） to form a compound film on a carbon glassy carbon electrode （GCE） which has prepared by acetylene black （AB）. The electrochemical behavior of ethyl naphthol （EN） was investigated on a PMA/AB/GCE by cyclic vohammetry（CV）. EN indicatied a sensitive oxidation peak in the pH 5.5 HAc-NaAc buffer solution. The oxidation peak current was linear to square root of the scan rate in the range of 60 - 300 mV/s, with indicated that electrode process of EN was controlled by diffusion. The effective area of the PMA/AB/GCE was calculated to be 0. 122 cm2 ;the electron transfer number was 1 ;the diffusion coefficient （D）was 9. 64× 10-5cm2/s. Square wave vohammetry was used to determine the concentration of EN. A good linearity was observed between the peak current and the concentration of EN in the range from 9. 0 × 10-7 to 1.0 × 10-4mol/L. The detection limit was 6. 35 × 10 -7mol/L（S/N =3）. The spike recoveries of the samples were 92. 8% - 102. 8%.
出处
《分析试验室》
CAS
CSCD
北大核心
2013年第9期46-50,共5页
Chinese Journal of Analysis Laboratory
基金
四川省高校科技创新团队建设项目(2010008)资助
关键词
乙炔黑
磷钼酸
乙萘酚
方波伏安法
Ethyl naphthol
Phosphomdybdic acid
Acetylene black
Square wave voltammetry
