Journal
TALANTA
Volume 82, Issue 5, Pages 1820-1825Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2010.07.081
Keywords
Bucky-gel; Chemically modified electrode; Environmental analysis; Lead ions; fM Detection
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Funding
- Science Foundation of Department of Education of Hubei Province, P.R. China [D20091501]
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Femtomolar (fM) leveled lead ions were electrochemically detected using a bucky-gel coated glassy carbon electrode and differential pulse anodic stripping voltammetry. The bucky-gel was composed of dithizone, ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate), and multi-walled carbon nanotubes (MWCNTs). The fabrication of the bucky-gel coated electrode was optimized. The modified electrode was characterized with voltammetry, electrochemical impedance spectroscopy, and chronoamperometry. After the accumulation of lead ions into the bucky-gel modified electrode at -1.2 V vs. saturated calomel electrode (SCE) for 5 min in a pH 4.4 sodium acetate-acetate acid buffer solution, differential pulse anodic stripping voltammograms of the accumulated lead show an anodic wave at -0.58 V. The anodic peak current is detectable for lead ions in the concentration range from 1.0 mu M down to 500 fM. The detection limit is calculated to be 100 fM. The proposed method was successfully applied for the detection of lead ions in lake water. (C) 2010 Elsevier B.V. All rights reserved.
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