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Preparation of a silica gel modified with 2-amino-1,3,4-thiadiazole for adsorption of metal ions and electroanalytical application

Author(s): Dias Filho Newton L. | Caetano Laércio | Carmo Devaney R. do | Rosa André H.

Journal: Journal of the Brazilian Chemical Society
ISSN 0103-5053

Volume: 17;
Issue: 3;
Start page: 473;
Date: 2006;
Original page

Keywords: silica gel functionalized | preconcentration | carbon paste electrode | mercury

Silica gel with a specific area of 382 m² g-1 and an average pore diameter of 60 Å was chemically modified with 2-amino-1,3,4-thiadiazole, for the purpose of selective adsorption of heavy metals ions and possible use as a chemically modified carbon paste electrode (CMCPE). The following properties of this functionalized silica gel are discussed: selective adsorption of heavy metal ions measured by batch and chromatographic column techniques, and utilization as preconcentration agent in a chemically modified carbon paste electrode (CMCPE) for determination of mercury(II). The chemical selectivity of this functional group and the selectivity of voltammetry were combined for preconcentration and determination.
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