Study on electrochemical behavior of cadmium on inlaid carbon nanotubesbismuth film glassy carbon electrode and determination by potentiometric stripping method
GAO Yuntao 1，2, ZHOU Xuejin 1，2, LIU Qiong 1，2, ZHANG Gongxin 1，2, LI Xiaofen 1，2
1.School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650031, China; 2. Key Laboratory of Ethnic Medicine Resource Chemistry，State Ethnic Affairs Commission & Ministry of Education, Kunming 650500, China
Abstract： A novel inlaid carbon nanotubesbismuth film glassy carbon electrode was prepared. The electrochemical behavior of Cd on the electrode was investigated by cyclic voltammetry. An inreversible oxidation peak of Cd on the electrode was observed, Epa=0.637 V（vs．SCE）. High sensitive electrochemical response of Cd on this electrode was obtained. The influencing factors for differential potentiometric stripping analysis of Cd were tested. The optimum conditions were -1.1 V of deposition potential, 0.4 mg/L of Bi3+ concentration, pH 4.6 HAc-NaAc buffer solution. The analytical reliability of this electrode was enhanced by insitu plated bismuth film and standard addition method. The stripping peak height (dt/dE) is a linear function of Cd concentration over the range 0.1-2.0 μg/L in the optimum conditions, with the detection limit of 0.2 μg/L.The proposed method was application in the determination of Cd in practical samples, the result was in agreement with those provided by AAS, RSD and the recovery were 3.1%-7.2%, 92%-102%, respectively.
高云涛，周学进，刘琼，张公信，李晓芬. 镉在嵌入式碳纳米管铋膜玻碳电极上的电化学行为及电位溶出法测定研究[J]. 冶金分析, 2012, 32(02): 11-16.
GAO Yuntao, ZHOU Xuejin, LIU Qiong, ZHANG Gongxin, LI Xiaofen. Study on electrochemical behavior of cadmium on inlaid carbon nanotubesbismuth film glassy carbon electrode and determination by potentiometric stripping method. , 2012, 32(02): 11-16.
