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Exfoliated Graphite Oxide Modified Electrode for the Selective Determination of Picomolar Concentration of Lead

Ramesha, GK and Sampath, S (2007) Exfoliated Graphite Oxide Modified Electrode for the Selective Determination of Picomolar Concentration of Lead. In: Electroanalysis, 19 (23). pp. 2472-2478.

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We report the selective, picomolar determination of lead(II) ions using exfoliated graphite oxide (EGO) modified glassy carbon electrode. Exfoliated graphite oxide is the oxidized form of exfoliated graphite containing a variety of functional groups such as hydroxyl, phenolic and carboxyl groups. The EGO can be dispersed as a stable colloid in a wide range of pH, from 2 to 11. This leads to the flexibility of film formation on substrates and use of a variety of functional groups to complex lead ions. The analyte is preconcentrated and subsequently determined using differential pulse anodic stripping voltammetry. The factors influencing the determination of lead such as the pH of the analyte solution, preconcentration time and the thickness of EGO layer on the electrode surface have been optimized. Two linear ranges are observed between 1 mM and 10 \mu m and 0.1 \mu M and 1 pM for a 5 minute preconcentration time. The lowest detection limit is found to be 1 pM. The main advantages of the electrode are the ease of preparation of the modified electrode, low cost, sensitivity and selectivity. The analytical utility of the EGO modified electrode in the determination of lead is demonstrated by application to several water samples.

Item Type: Journal Article
Publication: Electroanalysis
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: Exfoliated graphite oxide (EGO); Differential pulse anodic stripping voltammetry (DPASV); Lead(II).
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 04 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ac.in/id/eprint/13187

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