Journal of the Brazilian Chemical Society
| Autor: | Teixeira, Leonardo Sena Gomes, Costa, Antonio Celso Spinola, Ferreira, Sergio Luis Costa, Freitas, Maria de Lourdes, Carvalho, Marcelo Souza de |
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| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UFBA Universidade Federal da Bahia (UFBA) instacron:UFBA |
| DOI: | 10.1590/S0103-50531999000600016 |
| Popis: | p. 519-522 Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-07-31T20:55:53Z No. of bitstreams: 1 9999999999999999999aaa.pdf: 41590 bytes, checksum: c61a8804631f046e03bbf63fb9befcc4 (MD5) Made available in DSpace on 2013-07-31T20:55:53Z (GMT). No. of bitstreams: 1 9999999999999999999aaa.pdf: 41590 bytes, checksum: c61a8804631f046e03bbf63fb9befcc4 (MD5) Previous issue date: 1999 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. São Paulo |
| Databáze: | OpenAIRE |
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