Artigo
Voltammetry of mercury (II) based on an organo-clay modified graphite electrode
Date
2008-11-17Registration in:
Portugaliae Electrochimica Acta, v. 26, n. 2, p. 163-179, 2008.
0872-1904
S0872-19042008000200001
2-s2.0-55849152805
2-s2.0-55849152805.pdf
0000-0002-2042-018X
Author
Universidade Estadual Paulista (Unesp)
Abstract
Organo-clay complex of ligand-hexadecyltrimethylammonium with montmorillonite was made for the purpose of application as a preconcentration agent in a chemically modified carbon paste electrode for determination of mercury (II) in aqueous solution. It was found out that the adsorption of Hg(II) by organo-clay complex is independent of the pH of the solution. It was also found out that the adsorption of the remaining metals Cd(II), Ps(II), Cu(II), Zn(II), and Ni(II) was dependent on the changes in pH solutions and increased when it varies from 1 to 8. The resultant material was characterized by cyclic and differential pulse anodic voltammetry using a modified graphite paste electrode in different supporting electrolytes. The mercury response was evaluated with respect to pH, electrode composition, preconcentration time, mercury concentration, possible interferences and other variables.