https://repositorio.ufba.br/handle/ri/4707
Tipo: | Artigo de Periódico |
Título: | Determinação espectrofotométrica simultânea de cobre e ferro em álcool etílico combustível com reagentes derivados da ferroína |
Título(s) alternativo(s): | Química Nova |
Autor(es): | Teixeira, Leonardo Sena Gomes Brasileiro, João F. Borges Junior, Mário Marques Cordeiro, Paulo Wilson Louzado Rocha, Sarah A. N. Costa, Antonio Celso Spinola |
Autor(es): | Teixeira, Leonardo Sena Gomes Brasileiro, João F. Borges Junior, Mário Marques Cordeiro, Paulo Wilson Louzado Rocha, Sarah A. N. Costa, Antonio Celso Spinola |
Abstract: | In the present work three ferroin reagents were studied for the simultaneous spectrophotometric determination of iron and copper: 1,10-phenanthroline, 2,2'-bipyridine and 2,4,6-tri(2-pyridyl)-1,3,5-triazine. Effect of pH, conditions, order reagent addition, interferences, amount of reagents, lineal range, sensitivity and stability of each system were compared. The 2,4,6-tri(2-pyridyl)-1,3,5-triazine can be used for determination of iron in the presence of copper with a detection limit of 5 µg L-1 and coefficient of variation of 2.0%; However it was not possible to determine directly copper in the presence of iron with this reagent. 1,10-phenanthroline can be used for simultaneous determination of the metallic ions with detection limits of 7 and 8 mg L-1 and coefficients of variation of 1.8 and 2.3% in the determination of iron and copper, respectively. The results showed also that 2,2'-bipyridine can be used for simultaneous determination of the metallic ions with detection limits of 11 and 32 µg L-1 and coefficients of variation of 1.9 and 2.5% in the determination of iron and copper, respectively. The reagents were used for spectrophotometric determination of iron and copper in ethanol fuel. |
Palavras-chave: | Alcohol fuel Ferroin Spectrophotometry |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/4707 |
Data do documento: | 2006 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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