Determination of Cu, Ni and Pb in aqueous medium by FAAS after pre-concentration on 2-aminothiazole modified silica gel

• Main Authors: Alcântara Ilton Luiz de, Roldan Paulo dos Santos, Margionte Maurício A. L., Castro Gustavo R., Padilha Cilene C. F., Florentino Ariovaldo de Oliveira, Padilha Pedro de Magalhães
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2004-01-01
• Series: Journal of the Brazilian Chemical Society
• Subjects: pre-concentration; 2-aminothiazole modified silica gel; water samples; FAAS
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000300005

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 µL 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.