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Determinação espectrofotométrica simultânea de cobre e ferro em álcool etílico combustível com reagentes derivados da ferroína Simultaneous spectrophotometric determination of iron and copper using ferroin reagents

Leonardo S. G. Teixeira ; João F. Brasileiro ; Mário M. Borges Jr ; Paulo W. L. Cordeiro ; Sarah A. N. Rocha ; Antonio C. Spínola Costa

Química nova, 2006-07, Vol.29 (4), p.741-745 [Periódico revisado por pares]

Sociedade Brasileira de Química

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  • Título:
    Determinação espectrofotométrica simultânea de cobre e ferro em álcool etílico combustível com reagentes derivados da ferroína Simultaneous spectrophotometric determination of iron and copper using ferroin reagents
  • Autor: Leonardo S. G. Teixeira ; João F. Brasileiro ; Mário M. Borges Jr ; Paulo W. L. Cordeiro ; Sarah A. N. Rocha ; Antonio C. Spínola Costa
  • Assuntos: alcohol fuel ; ferroin ; spectrophotometry
  • É parte de: Química nova, 2006-07, Vol.29 (4), p.741-745
  • Descrição: 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.
  • Editor: Sociedade Brasileira de Química
  • Idioma: Inglês

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