Square wave anodic stripping voltammetric determination of Cd²⁺ and Pb²⁺ at bismuth-film electrode modified with electroreduced graphene oxide-supported thiolated thionine

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• 作者：Zou Li^a ; Li Chen^a ; Fang He^a ; Lijuan Bu^a ; Xiaoli Qin^a ; Qingji Xie^a ; ^{xieqj@hunnu.edu.cn" class="auth_mail} ; Shouzhuo Yao^a ; Xinman Tu^b ; Xubiao Luo^b ; Shenglian Luo^b
• 关键词：Cd2+ and Pb2+ ; Square wave anodic stripping voltammetry ; Thiolation ; Electroreduced graphene oxide&ndash ; thionine&ndash ; 2-mercaptoethanesulfonate nanocomposite ; Electrochemical quartz crystal microbalance
• 刊名：Talanta
• 出版年：May, 2014
• 年：2014
• 卷：122
• 期：Complete
• 页码：285-292
• 全文大小：1025 K

文摘

Graphene oxide (GO)-thionine (TH) nanocomposite was prepared by 蟺-蟺 stacking. The nanocomposite was cast-coated on a glassy carbon electrode (GCE) to prepare an electroreduced GO (ERGO)-TH/GCE, then 2-mercaptoethanesulfonate (MES) was covalently tethered to ERGO-TH by potentiostatic anodization to form an ERGO-TH-MES/GCE. The thiolation reaction was monitored by electrochemical quartz crystal microbalance (EQCM). Square wave anodic stripping voltammetry (SWASV) was used to determine Cd²⁺ and Pb²⁺ at the ERGO-TH-MES/GCE further modified with Nafion and Bi. Under the optimal conditions, the linear calibration curves for Cd²⁺ and Pb²⁺ are from 1 to 40 渭g L^鈭?, with limits of detection (S/N=3) of 0.1 渭g L^鈭? for Cd²⁺ and 0.05 渭g L^鈭? for Pb²⁺, respectively. The electrode was used for the simultaneous analysis of Cd²⁺ and Pb²⁺ in water samples with satisfactory recovery.