摘要
目的：考察并优化壳聚糖（CTS）-多壁碳纳米管（MWCNT）修饰电极溶出伏安法测定Pb、Cu的条件.方法：将MWCNT分散于CTS溶液修饰玻碳电极作为工作电极,采用差分脉冲溶出伏安法对Pb、Cu进行连续测定.结果：选择pH值为4.5的0.5mol·L-1的HAc-NaAc缓冲溶液为底液,富集电位为-1.1V,富集时间180s,Pb、Cu溶出峰在10～200μg·L-1范围呈良好线性关系,检出限分别为1.5×10-6、1.2×10-6g·L-1,RSD分别为2.42％、4.19％,回收率在99.2％～102.9％.结论：该法仪器简单、环保,操作简便,测定食品中Pb、Cu的结果与石墨炉原子吸收法一致,可实现多种元素的连续快速测定.
The experiment conditions of determining Pb and Cu by CTS-MWCNT modified glassy carbon electrode were investigated and optimized Pb and Cu were determined by differential pulse stripping vohammetry based on glassy carbon electrode which was modified by MWCNT-CTS as working electrode. 0.5mol ·L^-1 HAcNaAc （pH=4.5）was used as substrate. When preconcentration potential was -1.1V and preconcentration time was 180s,the oxidation peak currents showed linearly with the concentration of Pb and Cu over the range from 10 to 2001μg·L^-1. The detection limit of Pb and Cu were 1.5×10^-6g·L^-1 and 1.2×10^-6g·L^-1. The RSD were 2.42% and 4.19%, respectively. The recovery rate was in ranges of 99.2% and 102.9%. The apparatus is simple and harmless to the environment. The method is easy to operate. The determination resuts of the methed agree with graphite furnace atomic absorption spectrometry. It can be realized that many elements were determined continuously and rapidly.
出处
《化学工程师》
CAS
2014年第5期31-34,共4页
Chemical Engineer
基金
河北省科学技术研究与发展指导计划项目11277164
