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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/8264

Title: 2-(2-Thiazolylazo)-p-cresol as a spectrophotometric reagent for vanadium determination in the presence of ascorbic acid
Other Titles: Microchimica Acta
Authors: Teixeira, Leonardo Sena Gomes
Costa, Antonio Celso Spinola
Queiroz, Adriana Santana
Amorim, Adelaide Maria Mendonça
Bomfim, Osvaldo N.
Ferreira, Sergio Luis Costa
Keywords: vanadium;TAC;spectrophotometry;steel
Issue Date: 1998
Abstract: The present work describes the use of 2-(2-thiazolylazo)-p-cresol (TAC) as a spectrophotometric reagent for vanadium determination. TAC reacts with vanadium(IV) in the presence of ascorbic acid, forming a red complex with absorption maximum at 525 nm. The following parameters were studied: complex stability, pH effect, amount of TAC, amount of acetate buffer, HEDTA effect, order of addition of reagents and Beer's law validity. TAC can be used for vanadium determination in the pH range 4.6–6.0, with molar absorptivity of 2.11 × 104Lmole−1 cm−1 (at525nm). Beer's law is obeyed up to 2.0 μg mL−1. Many cation interferences can be easily eliminated by using HEDTA as a masking agent. Steel reference standards were used to test the proposed procedure and the accuracy and precision obtained were satisfactory.
Description: Texto completo: acesso restrito. p.103-106
URI: http://www.repositorio.ufba.br/ri/handle/ri/8264
ISSN: 0026-3672
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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