微波消解-铋膜/Nafion修饰电极溶出伏安法测定鳗鱼中的镉含量  

Determination of Cadmium in Eel by Microwave Digestion Followed by Stripping Voltammetry on Bismuth/Nafion Modified Electrode

作　　者：李静[1] 李红波[1,2] 范大和[1] 王伟[1] 

机构地区：[1]盐城工学院化学与生物工程学院,江苏盐城224051 [2]扬州大学化学化工学院,江苏扬州225002

出　　处：《食品科学》2011年第14期190-193,共4页Food Science

基　　金：国家自然科学基金面上项目(20875081;21075107);盐城工学院自然科学基金项目(XKY2009009;XKY2009010);盐城市科技项目(YK2009032)

摘　　要：运用铋膜/Nafion修饰电极耦合微波消解技术测定鳗鱼中的Cd2+。Cd2+在-0.85V处出现清晰的方波氧化峰。Nafion、铋膜的厚度、缓冲液的pH值、富集电位、富集时间及可能干扰物质的影响因素进行考察。Cd2+在4.0～14.0μg/L质量浓度范围内线性关系,线性相关性系数为0.9964,检出限为0.2μg/L。结果表明,该传感器在过量的干扰离子存在条件下,表现出超灵敏性和有效性。A stripping voltammetric method based on microwave digestion was developed for determining cadmium in eel on a bismuth/nafion modified electrode. Oxidation yield a well-defined square wave peak for Cd^2＋ at about - 0.85 V. Nation concentration, bismuth film thickness, buffer solution pH, deposition potential accumulation time and other potential interference factors were investigated. A linear relationship was found between peak area and cadmium concentration over the range of 4.0 to 14.0 μg/L with a correlation coefficient of 0.9964. The limit of detection of the method was 0.2 μg/L. The sensor was highly sensitive and effective to detect cadmium even in the presence of several excess potential interference ions.

关 键 词：微波消解 溶出伏安法 铋膜 NAFION 镉 

分 类 号：O657.1[理学—分析化学]