Use este identificador para citar ou linkar para este item: http://carpedien.ien.gov.br:8080/handle/ien/2535
Tipo: conferenceObject
Título: Eletro-oxidative leaching of pitchblende minerals for uranium extration and determination by spectrophotometry in flow injection analysis system
Autor(es): Sousa, Alvaro Serafim Ferreira de
Ferreira, Elizabeth de Magalhães Massena
Cassela, Ricardo
Resumo: A method for uranium extraction from pitchblende minerals samples by electro-oxidative leaching was developed. An electro-dissolution cell associated to an on line sampler system was designed and tested in order to evaluate the influence of current density, leaching time, temperature and the nature and concentration of the electrolyte on the electro-oxidative leaching process. The flow analysis system used in the uranium determination yielded analytical curves with a linear behavior (r= 0.999) in the concentration range of 0.05 to 2.0 mg L-1, a relative standard deviation of 5.5% (at 0.1 mg L-1), a detection limit of 0.02 mg L-1 and analytical throughput of 60 determination per hour. The results obtained by the developed methodology for the uranium electro-oxidative extraction from pitchblende minerals samples showed a good agreement (r= 0.999) up to 98% were achieved for one minute leaching time, with a good reproducibility. The electro-oxidative extraction system showed advantages in relation to the conventional technique, such as: possibility of automation of all analytical process, use of lower sample amounts, more swiftness in the uranium extraction and use of lower amounts of acids.
Palavras-chave: INAC 2007
Uranium extraction
Pinchblende minerals
Spectrophometry
Idioma: eng
País: Brasil
Editor: Instituto de Engenharia Nuclear
Sigla da Instituição: IEN
Tipo de Acesso: openAccess
URI: http://carpedien.ien.gov.br:8080/handle/ien/2535
Data do documento: Set-2007
Aparece nas coleções:Radioquímica e Química Nuclear - Trabalhos de Congresso



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