| 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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MedLine Citation:
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PMID: 16317899 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 KNO3 vs. 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 microg L(-1). The precision of determination was satisfactory for the respective concentration level. |
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Authors:
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Newton L Dias Filho; Devaney R do Carmo; Fergus Gessner; Andr? H Rosa |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Analytical sciences : the international journal of the Japan Society for Analytical Chemistry Volume: 21 ISSN: 0910-6340 ISO Abbreviation: Anal Sci Publication Date: 2005 Nov |
Date Detail:
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Created Date: 2005-12-01 Completed Date: 2006-02-09 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8511078 Medline TA: Anal Sci Country: Japan |
Other Details:
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Languages: eng Pagination: 1309-16 Citation Subset: IM |
Affiliation:
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Departamento de F?sica e Qu?mica, Unesp-Universidade Estadual Paulista, Ilha Solteira, SP, Brazil. nldias@dfq.feis.unesp.br |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Aluminum Silicates / chemistry Anions / chemistry Bentonite / chemistry* Calibration Carbon / chemistry* Cations, Divalent / chemistry Cetrimonium Compounds / chemistry* Electrochemistry Fresh Water / analysis Hydrogen-Ion Concentration Ion-Selective Electrodes* Mercury / analysis*, chemistry Oxidation-Reduction Reproducibility of Results Seawater / analysis Thiazoles / chemistry* Thiazolidines X-Ray Diffraction |
| Chemical | |
Reg. No./Substance:
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0/Aluminum Silicates; 0/Anions; 0/Cations, Divalent; 0/Cetrimonium Compounds; 0/Thiazoles; 0/Thiazolidines; 1302-78-9/Bentonite; 1302-87-0/clay; 6899-10-1/cetrimonium; 7439-97-6/Mercury; 7440-44-0/Carbon; 96-53-7/2-mercaptothiazoline |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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