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Talanta. 2014 May;122:285-92. doi: 10.1016/j.talanta.2014.01.062. Epub 2014 Jan 31.

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

Author information

  • 1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
  • 2Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China. Electronic address: xieqj@hunnu.edu.cn.
  • 3Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycling, Nanchang Hangkong University, Nanchang 330063, China.

Abstract

Graphene oxide (GO)-thionine (TH) nanocomposite was prepared by π-π 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 Cd(2+) and Pb(2+) at the ERGO-TH-MES/GCE further modified with Nafion and Bi. Under the optimal conditions, the linear calibration curves for Cd(2+) and Pb(2+) are from 1 to 40 μg L(-1), with limits of detection (S/N=3) of 0.1 μg L(-1) for Cd(2+) and 0.05 μg L(-1) for Pb(2+), respectively. The electrode was used for the simultaneous analysis of Cd(2+) and Pb(2+) in water samples with satisfactory recovery.

KEYWORDS:

Cd(2+) and Pb(2+); Electrochemical quartz crystal microbalance; Electroreduced graphene oxide–thionine–2-mercaptoethanesulfonate nanocomposite; Square wave anodic stripping voltammetry; Thiolation

PMID:
24720997
DOI:
10.1016/j.talanta.2014.01.062
[PubMed - indexed for MEDLINE]
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