羧基化碳纳米管修饰玻碳电极伏安法测定痕量钯
来源期刊：冶金分析2010年第12期
论文作者：李俊华 邝代治 冯泳兰 唐文清 屈景年
文章页码：6 - 9
关键词：玻碳电极； 碳纳米管； 线性扫描伏安法； 钯
Key words：glass carbon electrode； carbon nanotubes； linear sweep voltammetry； palladium
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5.0×10-10～1.0×10-7 mol/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1.5×10-10 mol/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%。
Abstract: 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.
李俊华1，邝代治1，冯泳兰1，唐文清1，屈景年1
(1.湖南省衡阳市衡阳师范学院化学与材料科学学院功能金属有机材料湖南省普通高等学校重点实验室)
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5.0×10-10～1.0×10-7 mol/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1.5×10-10 mol/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%。
关键词：玻碳电极； 碳纳米管； 线性扫描伏安法； 钯
