%0 Journal Article
%T Determination of Metal Ions in Fuel Ethanol after Preconcentration on 5-Amino-1,3,4-Thiadiazole-2-Thiol Modified Silica Gel
%A Gomes Luis A. de Melo
%A Padilha Pedro de Magalh£¿es
%A Moreira Jos¨¦ Celso
%A Dias Filho Newton L.
%J Journal of the Brazilian Chemical Society
%D 1998
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%X This work describes the synthesis and characterization of 5-amino-1,3,4-thiadiazole-2-thiol modified silica gel (SiATT), and the results of a study of the adsorption and preconcentration (in batch, and in flow using a column technique) of Cd(II), Co(II), Cu(II), Fe(III), Ni(II), Pb(II) and Zn(II) in ethanol medium. The adsorption capacities for each metal ion were (in mmol g-1): Cd(II) = 0.11, Co(II) = 0.10, Cu(II) = 0.20, Fe(III) = 0.20, Ni(II) = 0.16, Pb(II) = 0.08 and Zn(II) = 0.12. The results obtained in the flow experiments, showed a recovery of ca. 100% of the metal ions adsorbed in a column packed with 2 g of SiATT, using 5 mL of 2.0 mol L-1 HCl solution as eluent. The sorption-desorption of the metal ions made possible the development of a preconcentration method and quantification by Flame AAS of metal ions at trace level in fuel ethanol.
%K preconcentration
%K 5-amino-1
%K 3
%K 4-thiadiazole-2-thiol modified silica gel
%K fuel ethanol
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000500015