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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/8478

Title: Spectrophotometric determination of tin in copper-based alloys using pyrocatechol violet
Other Titles: Talanta
Authors: Costa, Antonio Celso Spinola
Teixeira, Leonardo Sena Gomes
Ferreira, Sergio Luis Costa
Keywords: Copper-based alloys;Pyrocatechol Violet;Spectrophotometric analysis;Tin determination
Issue Date: 1995
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.
Description: Texto completo: acesso restrito. p.1973–1978
URI: http://www.repositorio.ufba.br/ri/handle/ri/8478
ISSN: 0039-9140
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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