https://repositorio.ufba.br/handle/ri/8500
Tipo: | Artigo de Periódico |
Título: | Spectrophotometric determination of zinc in copper-base alloys with TAN |
Título(s) alternativo(s): | Microchimica Acta |
Autor(es): | Ferreira, Sergio Luis Costa Araújo, Neyla Margarida Lopo de Santos, Adriana B. Dantas, Alailson Falcão Costa, Antonio Celso Spinola |
Autor(es): | Ferreira, Sergio Luis Costa Araújo, Neyla Margarida Lopo de Santos, Adriana B. Dantas, Alailson Falcão Costa, Antonio Celso Spinola |
Abstract: | TAN reacts with zinc(II) forming a red complex with composition 1:2 Zn(II)-TAN and absorption maximum at 582 nm. Zinc can be determined with this reagent in the presence of Triton X-100, in the pH range 6.20-8.00 with a molar absorptivity of 4.5×104 l/mol/cm Beer's Law was obeyed up to least 1.55 μg/ml. Copper interference was eliminated with a mixture of thiosulfate and ascorbic acid and nickel separated by precipitation with dimethylglyoxime. The proposed method was used for zinc determination in several copper-base alloys and the results of analysis in comparison with certified values indicated that the procedure was accurate and precise. A derivative procedure is also proposed, allowing zinc determination with high sensitivity (5-400 ng/ml). |
Palavras-chave: | zinc 1-(2-thiazolylazo)-2-naphthol spectrophotometry derivative spectrophotometry copper-base alloys |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/8500 |
Data do documento: | 1995 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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Ferreira.pdf Restricted Access | 801,12 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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