芦荟中微量锌的阳极溶出伏安法测定及电极反应机理  

The Electrode Reaction Mechanism and Anodic Stripping Voltammetry Determination of Zinc(Ⅱ) in Aloe vera

作　　者：叶榕[1] 林新华[1] 罗红斌[1] 

机构地区：[1]福建医科大学药学系,福州350004

出　　处：《福建医科大学学报》2002年第4期412-415,共4页Journal of Fujian Medical University

基　　金：福建省科技厅重点科技攻关课题资助项目 (2 0 0 1Z0 3 5 )

摘　　要：目的　研究微分阳极溶出伏安法测定芦荟中微量锌的方法及电极反应机理。　方法　以氯化钾和乙二胺为支持电解质 ,玻碳电极为工作电极 ,在 - 1.80 V(vs,SCE)电位下富集 2 m in,测定其循环伏安曲线 ,且于- 1.80 V开始快速阳极扫描至 - 0 .35 V得溶出峰。　结果　于 - 1.30 V处可得一灵敏的微分阳极溶出峰 ,即峰电位 EP=- 1.30 V,峰电流 IP与 Zn( )的浓度在 0 .0 0 5～ 0 .0 5 0μg/ ml范围内呈线性关系 ,最低检出限为 0 .0 0 1μg/ m l,电极反应为完全不可逆双电子转移过程。　结论　该法用于芦荟中锌含量的测定 ,简便、快速。Objective\ To develop method for determination of zinc(Ⅱ) in Aloe vera with derivative anodic stripping voltammetry and to study electrode reaction mechanism.\ Methods\ In a supporting solution of ethylenediamine and potassium chloride, the cyclic voltammograms of Zinc(Ⅱ) has been obtained, and Zinc(Ⅱ) in Aloe vera was determined by a glassy carbon electrode,the adsorptive potential of Zn(Ⅱ) in -1 80 V(vs.SCE) for 2 min, sweeping quickly from -1 80 V to -0 35 V.\ Results\ The derivative stripping potential of Zinc(Ⅱ) was -1 30 V(vs.SCE).\ The peak current was proportional to the concentration of Zn(Ⅱ) over the range of 0 0050~0 050 μg/ml.\ The detective limit was 0 0010 \{μg/ml\}.\ Electrode reaction is a irreversible two\|electron transfer process.\ Conclusion\ The method is simple, rapid and reliable for Zn(Ⅱ) in Aloe vera analysis.\;

关 键 词：芦荟 锌 电位测定法 滴定分析法 

分 类 号：R284.1[医药卫生—中药学] R282.[医药卫生—中医学]