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Preparation of a Clay-modified Carbon Paste Electrode Based on 2-Thiazoline-2-thiol-hexadecylammonium Sorption for the Sensitive Determination of Mercury

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Abstract

A montmorillonite from Wyoming-USA was used to prepare an organo-clay complex, named 2-thiazoline-2-thiol-hexadecyltrimethylammonium-clay (TZT-HDTA-clay), for the purpose of the selective adsorption of the heavy metals ions and possible use as a chemically modified carbon paste electrode (CMCPE). Adsorption isotherms of Hg2+, Pb2+, Cd2+, Cu2+, and Zn2+ from aqueous solutions as a function of the pH were studied at 298 K. Conditions for quantitative retention and elution were established for each metal by batch and column methods. The organo-clay complex was very selective to Hg(II) in aqueous solution in which other metals and ions were also present. The accumulation voltammetry of Hg(II) was studied at a carbon paste electrode chemically modified with this material. The mercury response was evaluated with respect to the pH, electrode composition, preconcentration time, mercury concentration, “cleaning” solution, possible interferences and other variables. A carbon paste electrode modified by TZT-HDTA-clay showed two peaks: one cathodic peak at about 0.0 V and an anodic peak at 0.25 V, scanning the potential from–0.2 to 0.8 V (0.05 M KNO3vs. Ag/AgCl). The anodic peak at 0.25 V presents excellent selectivity for Hg(II) ions in the presence of foreign ions. The detection limit was estimated as 0.1 µg L−1. The precision of determination was satisfactory for the respective concentration level.

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Authors and Affiliations

  1. Departamento de Física e Química, Unesp-Universidade Estadual Paulista, Av. Brasil, 56-Centro, C. P. 31, 15385-000, Ilha Solteira, S P, Brazil

    Newton L. Dias Filho & Devaney R. do Carmo

  2. Instituto de Química de São Carlos, Universidade de São Paulo, C. P. 369, 13560-970, São Carlos, S P, Brazil

    Fergus Gessner

  3. Departamento de Engenharia Ambiental, Unesp-Universidade Estadual Paulista, CEP 18087-180, Sorocaba, SP, Brazil

    André H. Rosa

Authors
  1. Newton L. Dias Filho
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  2. Devaney R. do Carmo
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  3. Fergus Gessner
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  4. André H. Rosa
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Correspondence to Newton L. Dias Filho.

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Filho, N.L.D., do Carmo, D.R., Gessner, F. et al. Preparation of a Clay-modified Carbon Paste Electrode Based on 2-Thiazoline-2-thiol-hexadecylammonium Sorption for the Sensitive Determination of Mercury. ANAL. SCI. 21, 1309–1316 (2005). https://doi.org/10.2116/analsci.21.1309

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  • DOI: https://doi.org/10.2116/analsci.21.1309

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