Uso do violeta de alizarina N (AVN) como reagente espectrofotométrico na determinação de alumínio Use of the alizarine violet N (AVN) as a spectrophotometric reagent for aluminium determination

The present work proposes the application of the 4-Hidroxy-3-(2-hydroxynaphtylazo)-benzenesulphonic acid (C.I. 15670), Alizarine Violet N (AVN), as a reagent for direct aluminium determination using molecular absorption spectrophotometry in the presence of tensoatives. Al(III) cation reacts with AVN...

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Bibliographic Details
Published in:Química nova 2000-04, Vol.23 (2), p.155-160
Main Authors: Alailson Falcão Dantas, Antônio Celso Spínola Costa, Sérgio Luís Costa Ferreira
Format: Article
Language:English
Subjects:
aluminium
spectrophotometry
tensoatives
Online Access:Get full text
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Summary:The present work proposes the application of the 4-Hidroxy-3-(2-hydroxynaphtylazo)-benzenesulphonic acid (C.I. 15670), Alizarine Violet N (AVN), as a reagent for direct aluminium determination using molecular absorption spectrophotometry in the presence of tensoatives. Al(III) cation reacts with AVN in pH 9.4, forming a red complex, stable for at least 24 hours, with absorption minimum at 607nm and, against a reagent blank, (epsiloncomplex - epsilonreagent) = -2.71x10(4) L.mol-1.cm-1. The reaction occurs in the presence of a Triton-X100 and CTAB tensoatives mixture, in the presence of EDTA. Al(III) determination is possible in the linear range of 50 up to 400ng.mL-1, with a detection limit of 41 ng.mL-1.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422000000200003