羧基化碳纳米管修饰玻碳电极伏安法测定痕量钯  

Voltammetric determination of trace palladium by carboxylic carbon nanotubes modified glass carbon electrode

作　　者：李俊华[1] 邝代治[1] 冯泳兰[1] 唐文清[1] 屈景年[1] 

机构地区：[1]衡阳师范学院化学与材料科学系,功能金属有机材料湖南省普通高等学校重点实验室,湖南衡阳421008

出　　处：《冶金分析》2010年第12期6-9,共4页Metallurgical Analysis

基　　金：湖南省“十一五”重点建设学科(2006180);湖南省高校创新平台开放基金项目(09K099,10K0107);衡阳市科技局项目(2009KG23、2009KG50);衡阳师范学院科学基金(09A32)资助

摘　　要：基于羧基化多壁碳纳米管(c-MWCNT)修饰玻碳电极,建立了无汞测定痕量钯的新方法。在0.1 mol/L的HAc-NaAc缓冲液(pH 4.5)中,当Pd2+在羧基化多壁碳纳米管修饰玻碳电极表面于-1.1 V电位下富集30 s,电位扫速为100 mV/s时,该修饰电极在线性扫描伏安图上出现一灵敏的阳极溶出峰,峰电位为0.162 V。峰电流与Pd2+浓度在5.0×10-10～1.0×10-7mol/L范围内成良好的线性关系,其相关系数为0.999,方法检出限可达1.5×10-10mol/L。该修饰电极稳定性较好,可用于钯催化剂中钯含量的测定,回收率为98%～103%。A new mercury-free determination method of trace palladium was established based on carboxylic multiwall carbon nanotubes（c-MWCNT） modified glass carbon electrode.In 0.1 mol/L HAc-NaAc（pH 4.5） buffer solution,there was a sensitive anodic stripping peak on linear sweep voltammograms and the stripping peak potential was 0.162 V when accumulation time of Pd2＋ at the modified electrode was 30 s at-1.1 V and potential scan rate was 100 mV/s.There was a good linear relationship between peak current and Pd2＋ concentration in the range of 5.0×10-10-1.0×10-7 mol/L with correlation coefficient of 0.999.Detection limit of this method was 1.5 × 10-10 mol/L.This kind of modified electrode could be used in the determination of palladium in palladium catalyst with recoveries of 98%-103% because of its good stability.

关 键 词：玻碳电极 碳纳米管 线性扫描伏安法 钯 

分 类 号：O657.14[理学—分析化学]