%0 Journal Article
%T Determination of Cu, Ni and Pb in aqueous medium by FAAS after pre-concentration on 2-aminothiazole modified silica gel
%A Alcantara
%A Ilton Luiz de
%A Roldan
%A Paulo dos Santos
%A Margionte
%A Maur¨ªcio A. L.
%A Castro
%A Gustavo R.
%A Padilha
%A Cilene C. F.
%A Florentino
%A Ariovaldo de Oliveira
%A Padilha
%A Pedro de Magalh£¿es
%J Journal of the Brazilian Chemical Society
%D 2004
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532004000300005
%X this work describes the synthesis and characterization of 2-aminothiazole modified silica gel (siat), and the results of a study of the adsorption and pre-concentration (in batch and using a flow-injection system coupled to an absorption atomic spectrometer) of cu(ii), ni(ii) and pb(ii) in aqueous medium. the adsorption capacities for each metal ions in mmol g-1 were: cu(ii)= 1.18, ni(ii)= 1.15 and pb(ii)= 1.10. the results obtained in the flow experiments showed a recovery of practically 100% of the metal ions adsorbed in a mini-column packed with 100 mg of siat, using 100 ¦Ìl of 2.0 mol l-1 hcl solution as eluent. the sorption-desorption of the metal ions made possible the application of a flow-injection system for the pre-concentration and quantification by faas of metal ions at trace level in natural water samples digested and not digest by an oxidizing uv photolysis.
%K pre-concentration
%K 2-aminothiazole modified silica gel
%K water samples
%K faas.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532004000300005&lng=en&nrm=iso&tlng=en