摘要
目的考察并优化同位镀锑膜电极差分脉冲溶出伏安法测定铅、镉的条件。方法采用差分脉冲溶出伏安法,以锑膜修饰金电极作为工作电极测定食品中痕量铅、镉离子。结果铅、镉在锑膜电极上可得到灵敏的溶出峰,铅、镉的溶出电位分别为0.58 V(EPb)和0.81 V(ECd)。当电沉积时间为180 s时,铅、镉的检出限分别为1.95和2.10μg/L,RSD分别为1.14%和0.95%,铅、镉溶出峰电流同0～100μg/L铅、镉离子呈良好的线性关系(r≥0.997)。结论利用本方法测定了食品样品中铅、镉的含量,并与石墨炉原子吸收分光光度法做了对比,结果令人满意,同时使用锑膜修饰电极可避免使用汞膜电极带来的环境污染。
Objective To investigate and optimize the experiment conditions of determining lead and cadmium with antimony film-plated electrode.Methods Antimony film-plated gold electrode was prepared by in-situ plating for the determination of trace lead and cadmium by differential pulse stripping voltammetry.Results Lead and cadmium displayed well defined peaks in the antimony film-plated electrode by differential pulse stripping voltammetry;and the stripping potential were-0.58 V and-0.81 V for lead and cadmium respectively.Following a 180 s preconcentration,the oxidation peak currents changed linearly with the concentration of lead and cadmium over the range from 0 to 100 μg/L（r≥0.99）,and the detection limits of lead and cadmium were 1.95 and 2.10 μg/L,RSD were 1.14% and 0.95% respectively.Conclusion The antimony film-plated electrode was applied to the determination of lead and cadmium in food samples.Comparing with Graphite furnace atomic absorption spectrometry,the concordance of results was satisfactory.Environmental pollution could be avoided by using the antimony film-plated electrode instead of mercury film electrode.
出处
《中国食品卫生杂志》
北大核心
2011年第6期524-527,共4页
Chinese Journal of Food Hygiene
基金
济宁医学院青年科学基金项目课题
关键词
同位镀锑膜
金电极
差分脉冲溶出伏安法
铅
镉
食品污染物
食品安全
In-situ plating antimony film electrode
gold electrode
differential pulse stripping voltammetry
lead
cadmium
food contaminants
food safety
作者简介
公维磊 男 讲师 研究方向为食品卫生检验gongweileiha@163．com
