%0 Journal Article
%T Determina£¿£¿o espectrofotom¨¦trica simultanea de cobre e ferro em ¨¢lcool et¨ªlico combust¨ªvel com reagentes derivados da ferro¨ªna
%A Teixeira
%A Leonardo S. G.
%A Brasileiro
%A Jo£¿o F.
%A Borges Jr.
%A M¨¢rio M.
%A Cordeiro
%A Paulo W. L.
%A Rocha
%A Sarah A. N.
%A Costa
%A Antonio C. Sp¨ªnola
%J Qu¨ªmica Nova
%D 2006
%I Sociedade Brasileira de Qu¨ªmica
%R 10.1590/S0100-40422006000400020
%X 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 ¦Ìg 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 ¦Ìg 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.
%K alcohol fuel
%K ferroin
%K spectrophotometry.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0100-40422006000400020&lng=en&nrm=iso&tlng=en