摘要
设计了一种N-辛基吡啶六氟硝磷酸盐离子液体粘合纳米四氧化三铁修饰丝网印刷电极,结合方波阳极溶出伏安法实现了重金属镉、铅离子的同步检测。并用循环伏安法、交流阻抗法、方波溶出伏安法进一步研究修饰电极的电化学性能,表明采用离子液体/纳米四氧化三铁复合膜可有效提高丝网印刷电极的电子传递能力和有效面积,修饰电极对镉离子和铅离子显示出了良好的检测灵敏性。在最优检测条件下,修饰电极对镉离子和铅离子峰电流在浓度分别为0.2~35.0μg/L和0.2~20.0μg/L范围内呈现良好的线性关系,检测下限分别为0.06、0.1μg/L(S/N=3)。将该电极用于检测土壤和水样本中的重金属镉和铅,表现出较好的选择性和检测精度。
A modified screen-printed carbon electrode was prepared and manufactured by using ionic liquid,nano-Fe_3O_4 and in situ plating bismuth film methods,which were used to detect heavy metal ions of cadmium and lead by stripping square wave voltammetry. Some electrochemical methods such as cyclic voltammetry,electrochemical impedance spectroscopy and square wave stripping voltammetry were further applied to investigate the properties of this electrode. It illustrated that the formed bismuth film / ionic liquid / nano-Fe_3O_4 layer on the top of screen-printed carbon electrode could remarkably improve the electron transfer and the specific surface area of the electrode owing to ionic conductivity and adhesiveness of IL and high electron transfer of nano-Fe_3O_4. Under the optimum conditions,the linear detection range of modified electrode was 0. 2 ~ 35. 0 μg / L and 0. 2 ~ 20. 0 μg / L for cadimium and lead with detection limit of 0. 06 μg / L and 0. 1 μg / L( S / N = 3). Finally,the proposed analytical procedure was applied to detect trace metal ions in real samples with satisfactory selectivity and results.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第S1期84-89,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)资助项目(2013AA102302)
高等学校博士学科点专项科研基金资助项目(20120008110033)
关键词
丝网印刷电极
重金属检测
离子液体
纳米四氧化三铁
Screen-printed carbon electrode
Heavy metal determination
Ionic liquid
Nano-Fe3O4
