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CIENCIA 13(1), 60-67, 2005 Maracaibo, V<strong>en</strong>ezuela <strong>Complejos</strong> <strong>de</strong> <strong>vanadio</strong> (<strong>III</strong>) <strong>en</strong> <strong>solución</strong> <strong>acuosa</strong> <strong>con</strong> <strong>los</strong> <strong>ácidos</strong> aminopolicarboxílicos EDTA y DTPA Jetsaly Mor<strong>en</strong>o1 , Mary Lor<strong>en</strong>a Araujo1 , Felipe Brito1 y Vito Lubes2* 1 C<strong>en</strong>tro <strong>de</strong> Equilibrios <strong>en</strong> Solución, Facultad <strong>de</strong> Ci<strong>en</strong>cias. Universidad C<strong>en</strong>tral <strong>de</strong> V<strong>en</strong>ezuela (UCV). Caracas 1040. V<strong>en</strong>ezuela. 2 Departam<strong>en</strong>to <strong>de</strong> Química. Universidad Simón Bolívar (USB). Apartado 89.000. Caracas 1080A. V<strong>en</strong>ezuela. Recibido: 14-05-04 Aceptado: 15-02-05 Resum<strong>en</strong> Se estudió mediante medidas <strong>de</strong> fuerzas electromotrices (emf H), la formación <strong>de</strong> <strong>los</strong> complejos <strong>de</strong> Vanadio(<strong>III</strong>) <strong>con</strong> <strong>los</strong> <strong>ácidos</strong> aminopolicarboxílicos etil<strong>en</strong>diamino-N,N,N’,N’-tetraacetico (EDTA) y dietil<strong>en</strong>triamina-N,N,N’,N’’,N’’-p<strong>en</strong>taacetico (DTPA) <strong>en</strong> <strong>solución</strong> <strong>acuosa</strong> a 25°C y <strong>en</strong> KCl 3,0 M (M = mol/dm 3 ) como medio iónico. El análisis <strong>de</strong> <strong>los</strong> datos pot<strong>en</strong>ciométricos mediante el programa computacional <strong>de</strong> mínimos cuadrados g<strong>en</strong>eralizados LETAGROP, indica la formación <strong>de</strong> cantida<strong>de</strong>s significativas <strong>de</strong> <strong>los</strong> complejos [VHL], [VL] - y [V(OH)L] 2- <strong>con</strong> el EDTA (Na2H2EDTA, H2L 2- ) y <strong>de</strong> <strong>los</strong> complejos [VH2L], [VHL] - , [VL] 2- y [V(OH)L] 3- <strong>con</strong> el DTPA (DTPA, H5L). Las respectivas <strong>con</strong>stantes <strong>de</strong> estabilidad <strong>de</strong> <strong>los</strong> complejos formados fueron <strong>de</strong>terminadas. Palabras clave: Ácidos aminopolicarboxílicos; <strong>con</strong>stantes <strong>de</strong> estabilidad; complejos <strong>de</strong> V(<strong>III</strong>); equilibrios <strong>en</strong> <strong>solución</strong>; especiación. Vanadium(<strong>III</strong>) complexes in aqueous solution with the aminopolycarboxylic acids EDTA and DTPA Abstract It was studied by means of electromotive forces measurem<strong>en</strong>ts (emf H), the formation of the Vanadium(<strong>III</strong>) complexes with the aminopolycarboxylic acids ethyl<strong>en</strong>diamine-N,N,N’,N’-tetraacetic (EDTA) and diethyl<strong>en</strong>triamine-N,N,N’,N’’,N’’-p<strong>en</strong>taacetic (DTPA) in aquous solution at 25°C and in 3.0 M (M = mol/dm 3 ) KCl as ionic media. The analysis of the pot<strong>en</strong>tiometric data by means of the least-squares computational program LETAGROP, indicates the formation of significant quantities of the complexes [VHL], [VL] - and [V(OH)L] 2with EDTA (Na2H2EDTA, H2L 2- ) and the complexes [VH2L], [VHL] - , [VL] 2- and [V(OH)L] 3- with DTPA (DTPA, H5L). The respective stability <strong>con</strong>stants of the complexes formed were <strong>de</strong>termined. Key words: Aminopolycarboxylic acids; solution equilibria; speciation; stability <strong>con</strong>stants; V(<strong>III</strong>) complexes. * Autor para la correspon<strong>de</strong>ncia. E-mail: vitolubes@hotmail.com /lubesv@usb.ve. Sci<strong>en</strong>tific Journal from the Experim<strong>en</strong>tal Faculty of Sci<strong>en</strong>ces, at La Universidad <strong>de</strong>l Zulia. Volume 13 Nº 1, January-March 2005