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Browsing by Author Lemos, Valfredo Azevedo

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Issue DateTitleAuthor(s)
2001An automated on-line flow system for the pre-concentration and determination of lead by flame atomic absorption spectrometryFerreira, Sergio Luis Costa; Lemos, Valfredo Azevedo; Santelli, Ricardo Erthal; Ganzarolli, Edgard; Curtius, Adilson José
2000An on-line continuous flow system for copper enrichment and determination by flame atomic absorption spectroscopyFerreira, Sergio Luis Costa; Lemos, Valfredo Azevedo; Moreira, Barbara C.; Costa, Antonio Celso Spinola; Santelli, Ricardo Erthal
Sep-2002An on-line system for preconcentration and determination of lead in wine samples by FAASLemos, Valfredo Azevedo; Guardia, Miguel de la; Ferreira, Sergio Luis Costa
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 Costa
Sep-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 Costa
2013Assessment of cadmium and lead in commercially important seafood from São Francisco do Conde, Bahia, BrazilSantos, Luis Fernandes Pereira; Trigueiro, Ivaldo Nidio Sitonio; Lemos, Valfredo Azevedo; Furtunato, Dalva Maria da Nóbrega; Cardoso, Ryzia de Cássia Vieira
2013Assessment of cadmium and lead in commercially important seafood from São Francisco do Conde, Bahia, BrazilSantos, Luis Fernandes Pereira; Trigueiro, Ivaldo Nidio Sitonio; Lemos, Valfredo Azevedo; Furtunato, Dalva Maria da Nóbrega; Cardoso, Ryzia de Cássia Vieira
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 Costa
8-Sep-2016Avaliação crítica da qualidade das águas da bacia hidrográfica do Rio JoanesFerreira, Sergio Luis Costa; Silva, Gildete Clarinda das Virgens; Araujo, Rennan Geovanny Oliveira; Souza, Anderson Santos; Jesus, Djane Santiago de; Teixeira, Leonardo Sena Gomes; Lemos, Valfredo Azevedo
4-May-2016Biodiesel de soja: estudo sobre estabilidade e produtos de oxidaçãoTeixeira, Leonardo Sena Gomes; Carvalho, Anaildes Lago de; Quintella, Cristina Maria Assis Lopes Tavares da Mata Hermida; Pepe, Iuri Muniz; Grosjean, Daniel Maurice; Lemos, Valfredo Azevedo; Silva, Gabriel Francisco da
2000Copper determination in natural water samples by using FAAS after preconcentration onto amberlite XAD-2 loaded with calmagiteFerreira, Sergio Luis Costa; Ferreira, Janeide R.; Dantas, Alailson Falcão; Lemos, Valfredo Azevedo; Araújo, Neyla Margarida Lopo de; Costa, Antonio Celso Spinola
1-Jun-2020Desenvolvimento e aplicação de um novo material de referência de farinha de milhoSantos, Ana Maria Pinto dos; Santos, Liz Oliveira dos; Lemos, Valfredo Azevedo; Santos, Walter Nei Lopes dos; Martin, Víctor Cerdá; Ferreira, Sérgio Luis Costa; Silva, Erik Galvão Paranhos da
Mar-2011Determination of copper, iron, lead and zinc in gasoline by sequential multi-element flame atomic absorption spectrometry after solid phase extractionSantos, Denilson S. S.; Korn, Maria das Graças Andrade; Guida, Mauro A. B.; Santos, Gabriel Luiz dos; Lemos, Valfredo Azevedo; Teixeira, Leonardo Sena Gomes
2008Development of a new sequential injection in-line cloud point extraction system for flame atomic absorption spectrometric determination of manganese in food samplesLemos, Valfredo Azevedo; Baliza, Patrícia Xavier; Carvalho, Anaildes Lago de; Oliveira, Rafael Vasconcelos; Teixeira, Leonardo Sena Gomes; Bezerra, Marcos de Almeida
2006Mercury determination in petroleum products by electrothermal atomic absorption spectrometry after in situ preconcentration using multiple injectionsDias, Fábio de Souza; Teixeira, Leonardo Sena Gomes; Santos, Walter Nei Lopes dos; Rebouças, Márcio das Virgens; Pereira, Madson de G.; Lemos, Valfredo Azevedo
19-Sep-2018Métodos de microextração em fase líquida para a determinação espectrométrica de mercúrio em amostras de frutos do mar e óleo de peixeSantos, Walter Nei Lopes dos; Menezes, Rebeca Moraes; Lemos, Valfredo Azevedo; Teixeira, Leonardo Sena Gomes; Brandão, Geovani Cardoso; Souza, Anderson Santos
2011Multi-element determination of Cu, Fe, Ni and Zn content in vegetable oils samples by high-resolution continuum source atomic absorption spectrometry and microemulsion sample preparationFernandes, Andréa Pires; Nunes, Luana Sena; Barbosa, José Tiago Pereira; Lemos, Valfredo Azevedo; Santos, Walter Nei Lopes dos; Korn, Maria das Graças Andrade; Teixeira, Leonardo Sena Gomes
2001On-line preconcentration system for lead determination in seafood samples by flame atomic absorption spectrometry using polyurethane foam loaded with 2-(2-benzothiazolylazo)-2-p-cresolLemos, Valfredo Azevedo; Ferreira, Sergio Luis Costa
2001On-line preconcentration system for nickel determination in food samples by flame atomic absorption spectrometryFerreira, Sergio Luis Costa; Santos, Walter Nei Lopes dos; Lemos, Valfredo Azevedo
2003On-line preconcentration system using a minicolumn of polyurethane foam loaded with Me-BTABr for zinc determination by Flame Atomic Absorption SpectrometrySantos, Walter Nei Lopes dos; Lemos, Valfredo Azevedo; Santos, Juracir Silva
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