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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/8478
Tipo: Artigo de Periódico
Título: Spectrophotometric determination of tin in copper-based alloys using pyrocatechol violet
Título(s) alternativo(s): Talanta
Autor(es): Costa, Antonio Celso Spinola
Teixeira, Leonardo Sena Gomes
Ferreira, Sergio Luis Costa
Autor(es): Costa, Antonio Celso Spinola
Teixeira, Leonardo Sena Gomes
Ferreira, Sergio Luis Costa
Abstract: In the present paper, a new procedure using Pyrocatechol Violet (PCV) for the determination of tin in copper-based alloys is proposed. The use of HEDTA as masking agent allowed tin to be determined in the presence of large amounts of copper, without any separation procedure. The method is more selective than previous methods. Cetyltrimethylammonium bromide (CTAB) and Tween-20 are used to increase the stability of the system. The method can be applied directly to an acidic solution of Sn(IV) in the range 2.0–60.0 μg with a final volume of 50 ml. The pH is adjusted to 2.0 ± 0.2 with glycine buffer and, after 30 min, the absorbance is measured at 660 nm. Al(III), Cd(II), Co(II), Mg(II), Ca(II), Mn(II), Ni(II) and Pb(II) do not interfere at the 500 mg level; 20 000 μg of Cu(II) and 400 μg of NaCl can be present. The interference at 100 μg of Fe(III) can be masked with ascorbic acid. Bi(III), Sb(V), Ti(IV), Mo(VI), EDTA, tartrate, citrate and iodide interfere. The proposed method was used for tin determination in several copper-based alloys and a comparison of the analytical results with certified values indicates that the procedure provides accurate and precise results.
Palavras-chave: Copper-based alloys
Pyrocatechol Violet
Spectrophotometric analysis
Tin determination
URI: http://www.repositorio.ufba.br/ri/handle/ri/8478
Data do documento: 1995
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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