Determinação de Cd por FAAS em meio aquoso após pré-concentração em linha sobre SiAT

• Autor(a) principal: De Moraes, F. V. [UNESP]
• Data de Publicação: 2003
• Outros Autores: De Alcântara, I. L. [UNESP], Roldan, P. D.S. [UNESP], De Castro, G. R. [UNESP], Margionte, M. A.L. [UNESP], Padilha, P. D.M. [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/224591
• topic: 2-aminothiazole modified silica gel; Flame atomic absorption spectrometry; Preconcentration

This paper described the preparation of 2-aminothiazole modified silica gel (SiAT) and the results of a study of the sorption and preconcentration (in batch and in flow using a column technique) of Cd(II) in aqueous medium. The sorption capacities for metal ion was 1.12 mmol g-1. The results obtained in the flow experiments, showed a recovery of 98% of Cd(II) adsorbed in a column packed with 1 g of SiAT, using 5.0 mL of 2.0 mol L-1 hydrochloric acid as eluent. An enrichment factor of 25 (150 mL solution containing 25 μg L-1 of Cd(II), 5.0 mL concentrated) was obtained by this preconcentration procedure. The sorption-desorption of Cd(II) made possible the development of a preconcentration method and quantification by Flame AAS of Cd(II) at trace level in aqueous samples.