茶叶科学2011，Vol.31Issue(6)：485-492,8.
MWCNTs-IL-SPCE传感器检测茶叶中痕量铅研究
Multi-walled Carbon Nanotubes-lonic Liquid Modified Screen-printed Carbon Electrodes for the Determination of Trace Lead in Tea
摘要
Abstract
A new, high sensitivity and selectivity electrochemical sensor for determination of trace lead in tea by differential pulse stripping voltammetry was investigated. For modification of the screen-printed carbon electrode, l-butyl-3-methylimidazolium hexafluorophosphate was applied as a super conductive binder and multi-walled carbon nanotubes were used after being functionalized. They improved the conductivity and signal transduction of electrode surface. In pH4.5 NaAc-Hac buffer containing 0.006 mol/L I, Pb2+ adsorbed onto the surface of MWCNTs-IL film coated SPCE at the deposition potential of -1.1 V. During the positive potential sweep, lead was oxidized, and a good stripping peak appeared at -0.30 V. Low concentration of I significantly enhanced the stripping peak current of lead. The liner relationship between stripping peak value and concentration of Pb2+ was in the range of 2~600 ug/L with the R value of 0.99926 and detection limit of 0.63 ug/L. No significant difference existed after the detection results were compared with ICP-MS method using t test. The high sensitivity and stability of this method demonstrated the application for a simple and economical determination of trace lead in tea.关键词
多壁碳纳米管/离子液体/丝网印刷碳电极/茶叶/铅Key words
multi-walled carbon nanotubes, ionic liquid, screen-printed carbon electrode, tea, lead分类
轻工纺织引用本文复制引用
徐旭明,窦文超,赵广英..MWCNTs-IL-SPCE传感器检测茶叶中痕量铅研究[J].茶叶科学,2011,31(6):485-492,8.基金项目
国家自然科学基金(No.30571623)、浙江省重中之重学科(No.Z05-29)、浙江工商大学校级创新基金(No.1110XJ1710139)、浙江工商大学新苗人才项目(No.3070JQ4111087G) （No.30571623）
