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Data do documentoTítuloAutor(es)Tipo
2006Separation and preconcentration procedures for the determination of lead using spectrometric techniques: A reviewKorn, Maria das Graças Andrade; Ferreira, Sergio Luis Costa; Andrade, Jailson Bittencourt de; Jesus, Djane S. de; Lemos, Valfredo Azevedo; Bandeira, Marcus Luciano Souza de Ferreira; Santos, Walter Nei Lopes dos; Bezerra, Marcos de Almeida; Amorim, Fábio Alan Carqueija; Souza, Anderson SantosArtigo de Periódico
1998Spectrophotometric Determination of Aluminium in Iron Ores Using Solid-Phase ExtractionFerreira, Sergio Luis Costa; Lemos, Valfredo Azevedo; Costa, Antonio Celso Spinola; Jesus, Djane Santiago de; Carvalho, Marcelo Souza deArtigo de Periódico
2007Review of procedures involving separation and preconcentration for the determination of cadmium using spectrometric techniquesKorn, Maria das Graças Andrade; Ferreira, Sergio Luis Costa; Andrade, Jailson Bittencourt de; Lemos, Valfredo Azevedo; Santos, Walter Nei Lopes dos; Souza, Anderson Santos; Ferreira, Hadla Sousa; Rodrigues, Frederico de Medeiros; Pereira, Madson de Godoi; Silva, Erik Galvão Paranhos daArtigo de Periódico
2007Automatic on-line pre-concentration system using a knotted reactor for the FAAS determination of lead in drinking waterSouza, Anderson Santos; Brandão, Geovani Cardoso; Santos, Walter Nei Lopes dos; Lemos, Valfredo Azevedo; Ganzarolli, Edgard Moreira; Bruns, Roy Edward; Ferreira, Sergio Luis CostaArtigo de Periódico
1999Selectivity enhancement in spectrophotometry: on-line interference suppression using polyurethane foam minicolumn for aluminum determination with Methyl Thymol BlueCassella, Ricardo Jorgensen; Santelli, Ricardo Erthal; Branco, Aline Garcia; Lemos, Valfredo Azevedo; Ferreira, Sergio Luis Costa; Carvalho, Marcelo Souza deArtigo de Periódico
2000Application of polyurethane foam loaded with BTAC in an on-line preconcentration system: cadmium determination by FAASLemos, Valfredo Azevedo; Santelli, Ricardo Erthal; Carvalho, Marcelo Souza de; Ferreira, Sergio Luis CostaArtigo de Periódico
2006A pre-concentration procedure using coprecipitation for determination of lead and iron in several samples using flame atomic absorption spectrometryFerreira, Sergio Luis Costa; Saracoglu, S.; Soylak, Mustafa; Peker, D. S. Kacar; Elci, L.; Santos, Walter Nei Lopes dos; Lemos, Valfredo AzevedoArtigo de Periódico
Set-2002An on-line system for preconcentration and determination of lead in wine samples by FAASLemos, Valfredo Azevedo; Guardia, Miguel de la; Ferreira, Sergio Luis CostaArtigo de Periódico