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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 |
| Jan-2004 | Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation | Carvalho, Luciene Santos de; Costa, Antonio Celso Spinola; Ferreira, Sergio Luis Costa; Teixeira, Leonardo Sena Gomes |
| 1995 | Spectrophotometric determination of tin in copper-based alloys using pyrocatechol violet | Costa, Antonio Celso Spinola; Teixeira, Leonardo Sena Gomes; Ferreira, Sergio Luis Costa |
| 1995 | Spectrophotometric determination of zinc in copper-base alloys with TAN | Ferreira, Sergio Luis Costa; Araújo, Neyla Margarida Lopo de; Santos, Adriana B.; Dantas, Alailson Falcão; Costa, Antonio Celso Spinola |
| 1998 | ICP–AES determination of small amounts of zinc in copper-base alloys after separation by adsorption of the zinc–TAN complex on Sep Pak C18 cartridges | Teixeira, Leonardo Sena Gomes; Reis, José Oscar N.; Costa, Antonio Celso Spinola; Ferreira, Sergio Luis Costa; Korn, Maria das Graças Andrade; Andrade, Jailson Bittencourt de |
| 1998 | Spectrophotometric determination of vanadium(IV) in the presence of vanadium(V) using Br-PADAP | Costa, Antonio Celso Spinola; Teixeira, Leonardo Sena Gomes; Jaeger, Helena Valli; Ferreira, Sergio Luis Costa |
| 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 |
| 1994 | Spectrophotometric and derivative spectrophotometric determination of aluminium with Hydroxynaphthol Blue | Ferreira, Sergio Luis Costa; Leite, Neide O.; Dantas, Alailson Falcão; Andrade, Jailson Bittencourt de; Costa, Antonio Celso Spinola |
| 1996 | Fast spectrophotometric determination of titanium in rocks with 3,4-dihydroxybenzoic acid | Ferreira, Sergio Luis Costa; Araújo, Neyla Margarida Lopo de; Matos, Renato C.; Torres, André Luís Carvalho; Costa, Antonio Celso Spinola |
| 1996 | Derivative spectrophotometric determination of nickel using Br-PADAP | Ferreira, Sergio Luis Costa; Costa, Antonio Celso Spinola; Jesus, Djane S. de |
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