摘要
将羧基化多壁碳纳米管分散在Nafion溶液中并滴涂在玻碳电极表面,制备了羧基化多壁碳纳米管-Nafion修饰电极(MWCNT′s-Nafion/GCE)。应用此修饰电极测定镉时,将试液在pH 4.8乙酸-乙酸钠缓冲溶液中,于-1.1V处预还原富集350s,然后在-1.2～-0.4V范围内扫描,使镉离子从修饰电极上溶出,实现了镉离子的差分脉冲阳极伏安法测定,在-0.84V可得镉离子的氧化峰电位,镉的质量浓度在5～100μg.L-1范围内与其峰电流呈线性关系,方法的检出限(3S/N)为2.54μg.L-1。方法用于测定水样中的痕量镉,与电感耦合等离子体质谱法测定值相一致。
Carboxylated multi-wall carbon nano-tubes（MWCNT′s） was dispersed in Nafion solution,and dropped on the surface of glassy carbon electrode（GCE） to prepare MWCNT′s-Nafion modified GCE（MWCNT′s-Nafion/GCE）.In the determination of Cd2＋-ion,the test solution in a NaOAc-HOAc buffer solution of pH 4.8 was pre-reduced and enriched for 350 s at-1.1 V,Cd2＋-ion was then stripped from the electrode by scanning in the range from-1.2 V to-0.4 V and determined by differential pulse anodic stripping voltammetry.Oxidation peak potential of Cd2＋-ion was observed at-0.84 V,at where linear relationship between values of peak current of Cd2＋-ion and its concentration was obtained in the range of 5-100 μg·L-1,with detection limit（3S/N） of 2.54 μg·L-1.The proposed method has been used in the determination of cadmium in water sample,giving results obtained in consistency with those obtained by ICP-MS.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2011年第11期1343-1345,1352,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
羧基化多壁碳纳米管
差分脉冲阳极伏安法
镉
Carboxylated multi-wall carbon nano-tubes
Differential pulse anodic stripping voltammetry
Cadmium
