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Measuring mercury ion concentration with a carbon nano tube paste electrode using the cyclic voltammetry method

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Abstract

A simply prepared carbon nano tube paste electrode (CNTPE) was utilized for monitoring mercury ion concentration using the cyclic voltammetry (CV) method and the square wave anodic stripping voltammetric (SWASV) method. The CNTPE was compared with various conventional electrodes. The CNTPE method was applied to determine the concentration of trace levels of Hg(II) in several water samples, which yielded a relative error of 0.6% with a concentration of 0.20 mg L−1 Hg(II). It was deposited at −0.5 V (vs Ag/AgCl), which was subsequently reduced to +0.20 V to strip it on the CNTPE. The optimal experimental conditions for the analysis were found to be as follows: pH value of 4 for the medium; deposition potential of −0.5 V; deposition time of 210 s; SW frequency of 40 Hz; SW amplitude of 100 mV, and step potential of 25 mV. Given these optimum conditions, a linear range was observed within the concentrations of 1.0–25.0 μg L−1 and 40.0–200.0 μg L−1. The detection limit was found to be 0.42 μg L−1.

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Acknowledgement

This work was supported by grant No. (R01-2003-000-10530-0) from Ministry of Science & Technology.

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Authors and Affiliations

  1. Department of Fine Chemistry, School of Applied Chemical Engineering, Seoul National University of Technology, gongreung 2-dong Nowon-gu, 172, Seoul, 139-743, South Korea

    Suw Young LY, Sung Kuk Kim, Tae Hyun Kim & Young Sam Jung

  2. Department of Ceramic art, School of Applied Chemical Engineering, Seoul National University of Technology, gongreung 2-dong Nowon-gu, 172, Seoul, 139-743, South Korea

    Sang Min Lee

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  1. Suw Young LY
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  2. Sung Kuk Kim
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  3. Tae Hyun Kim
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Correspondence to Sang Min Lee.

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LY, S., Kim, S., Kim, T. et al. Measuring mercury ion concentration with a carbon nano tube paste electrode using the cyclic voltammetry method. J Appl Electrochem 35, 567–571 (2005). https://doi.org/10.1007/s10800-005-2058-0

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  • DOI: https://doi.org/10.1007/s10800-005-2058-0

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