Sensitive square wave anodic stripping voltammetric determination of Cd²⁺ and Pb²⁺ ions at Bi/Nafion/overoxidized 2-mercaptoethanesulfonate-tethered polypyrrole/glassy carbon electrode

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• 作者：Li Chen ; Zou Li ; Yue Meng ; Pei Zhang ; Zhaohong Su ; Ying Liu ; Yi Huang ; Yaping Zhou ; Qingji Xie ; Shouzhuo Yao
• 关键词：Square wave anodic stripping voltammetry ; Overoxidation of polypyrrole ; 2-Mercaptoethanesulfonate ; Bismuth film electrode ; Pb2+ ; Cd2+
• 刊名：Sensors and Actuators B: Chemical
• 出版年：February, 2014
• 年：2014
• 卷：191
• 期：Complete
• 页码：94-101
• 全文大小：1164 K

文摘

Square wave anodic stripping voltammetry was applied to detect Pb²⁺ and Cd²⁺ ions at a glassy carbon electrode modified with overoxidized 2-mercaptoethanesulfonate (MES)-tethered polypyrrole, Nafion and Bi. The PPy-MES interaction was examined by quartz crystal microbalance. Under optimum conditions (5-min preconcentration at 鈭?.2 V vs. SCE in pH 4.0 acetate buffer containing 300 渭g L^鈭? Bi³⁺), the linear calibration curves ranged from 0.05 to 35 渭g L^鈭? for Pb²⁺ and 0.1 to 25 渭g L^鈭? for Cd²⁺, respectively, and the limits of detection (S/N = 3, S is the signal and N is the noise level) were 0.03 渭g L^鈭? for Pb²⁺ and 0.04 渭g L^鈭? for Cd²⁺. This method was successfully applied for Pb²⁺ and Cd²⁺ analysis in real water samples.