Determinação de Cd por FAAS em meio aquoso após pré-concentração em linha sobre SiAT
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Data
2003-12-01
Autores
De Moraes, F. V. [UNESP]
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]
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Resumo
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.
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2-aminothiazole modified silica gel, Flame atomic absorption spectrometry, Preconcentration
Como citar
Ecletica Quimica, v. 28, n. 1, p. 9-17, 2003.