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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/12394
Tipo: Artigo de Periódico
Título: Spectrophotometric Determination of Uranium Using 2-(2-Thiazolylazo)-p-Cresol (TAC) in the Presence of Surfactants
Título(s) alternativo(s): Journal of the Brazilian Chemical Society
Autor(es): Teixeira, Leonardo Sena Gomes
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
Freitas, Maria de Lourdes
Carvalho, Marcelo Souza de
Autor(es): Teixeira, Leonardo Sena Gomes
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
Freitas, Maria de Lourdes
Carvalho, Marcelo Souza de
Abstract: A sensitive and selective spectrophotometric method is proposed for the rapid determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC). The reaction between TAC and uranium (VI) is instantaneous at pH 6.5 and the absorbance remains stable for over 3 h. N-cetyl-N,N,N-trimethylamonium bromide (CTAB) and triton X-100 are used for increasing the sensitivity and solubility of the system respectively. The method allows the determination of uranium in the range from 0.30 to 12.0 mg mL-1 with a molar absorptivity of 1.31 x 104 L mol-1 cm-1 and features a detection limit of 26 ng mL-1 at 588 nm. The selectivity of the reagent was improved by the use of (1,2-cyclohexylenedinitrilo) tetraacetic acid (CyDTA) as masking agent. The proposed method has been successfully applied to the determination of uranium in mine drainage waters. The precision (R.S.D. < 2%) and the accuracy obtained were satisfactory.
Palavras-chave: 2-(2-Thiazolylazo)
p-Cresol
spectrophotometry
uranium determination
surfactants
Editora / Evento / Instituição: Journal of the Brazilian Chemical Society
URI: http://www.repositorio.ufba.br/ri/handle/ri/12394
Data do documento: 1999
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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