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| Issue Date | Title | Author(s) | | 1997 | Sensitive spectrophotometric determination of ascorbic acid in fruit juices and pharmaceutical formulations using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) | Ferreira, Sergio Luis Costa; Bandeira, Marcus Luciano Souza de Ferreira; Lemos, Valfredo Azevedo; Santos, Hilda Costa dos; Costa, Antonio Celso Spinola; Jesus, Djane S. de |
| 1998 | Spectrophotometric Determination of Aluminium in Iron Ores Using Solid-Phase Extraction | Ferreira, Sergio Luis Costa; Lemos, Valfredo Azevedo; Costa, Antonio Celso Spinola; Jesus, Djane Santiago de; Carvalho, Marcelo Souza de |
| Mar-2011 | Determination of copper, iron, lead and zinc in gasoline by sequential multi-element flame atomic absorption spectrometry after solid phase extraction | Santos, Denilson S. S.; Korn, Maria das Graças Andrade; Guida, Mauro A. B.; Santos, Gabriel Luiz dos; Lemos, Valfredo Azevedo; Teixeira, Leonardo Sena Gomes |
| Sep-2002 | An on-line system for preconcentration and determination of lead in wine samples by FAAS | Lemos, Valfredo Azevedo; Guardia, Miguel de la; Ferreira, Sergio Luis Costa |
| 2011 | On-line simultaneous pre-concentration procedure for the determination of cadmium and lead in drinking water employing sequential multi-element flame atomic absorption spectrometry | Santos, João Victor da Silva; Silva, O. B.; Araújo, André S.; Lemos, Valfredo Azevedo; Miró, Manuel; Ferreira, Sergio Luis Costa; Santos, Walter Nei Lopes dos |
| Nov-2009 | A procedure for determination of cobalt in water samples after dispersive liquid–liquid microextraction | Baliza, Patrícia Xavier; Teixeira, Leonardo Sena Gomes; Lemos, Valfredo Azevedo |
| Sep-2000 | Application of polyurethane foam loaded with BTAC in an on-line preconcentration system: cadmium determination by FAAS | Lemos, Valfredo Azevedo; Santelli, Ricardo Erthal; Carvalho, Marcelo Souza de; Ferreira, Sergio Luis Costa |
| 2011 | Multi-element determination of Cu, Fe, Ni and Zn content in vegetable oils samples by high-resolution continuum source atomic absorption spectrometry and microemulsion sample preparation | Fernandes, 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 |
| 2001 | An automated on-line flow system for the pre-concentration and determination of lead by flame atomic absorption spectrometry | Ferreira, Sergio Luis Costa; Lemos, Valfredo Azevedo; Santelli, Ricardo Erthal; Ganzarolli, Edgard; Curtius, Adilson José |
| 2000 | Application of polyurethane foam loaded with BTAC in an on-line preconcentration system: cadmium determination by FAAS | Lemos, Valfredo Azevedo; Santelli, Ricardo Erthal; Carvalho, Marcelo Souza de; Ferreira, Sergio Luis Costa |
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