Spectrophotometric determination of chromium in steel with 4-(2- thiazolylazo)-resorcinol (TAR) using microwave radiation by Carvalho Luciene S. de, Costa Antônio Celso S, Ferreira Sérgio L. C, Teixeira Leonardo S. G

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Spectrophotometric Determination of Zinc Using 7-(4-Nitrophenylazo)-8-Hydroxyquinoline-5-Sulfonic Acid by Korn Maria das Graças Andrade, Ferreira Adriana Costa, Teixeira Leonardo Sena Gomes, Costa Antonio Celso Spínola

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Construção de uma cela de fluxo para medidas por espectrofotometria em fase sólida by Reis Boaventura F., Rocha Fábio R. P., Teixeira Leonardo Sena Gomes, Costa Antônio Celso Spinola, Korn Mauro

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Spectrophotometric determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC) in the presence of surfactants by Teixeira Leonardo Sena Gomes, Costa Antonio Celso Spínola, Ferreira Sérgio Luís Costa, Freitas Maria de Lourdes, Carvalho Marcelo Souza de

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Determinação de Mn, Cu e Zn em matrizes salinas após separação e pré-concentração usando Amberlite XAD-7 impregnada com Vermelho de Alizarina S by Santos Júnior Aníbal de Freitas, Korn Maria das Graças Andrade, Jaeger Helena Valli, Silva Nívia Maria Silveira, Costa Antonio Celso Spínola

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Preconcentration and Determination of Copper and Zinc in Natural Water Samples by ICP-AES After Complexation and Sorption on Amberlite XAD-2 by Ferreira Sérgio Luis Costa, Santos Hilda Costa dos, Ferreira Janeide Reis, Araújo Neyla Margarida Lopo de, Costa Antônio Celso Spinola, Jesus Djane Santiago de

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