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Type: Artigo de periódico
Title: Application of the split-plot experimental design for the optimization of a catalytic procedure for the determination of Cr(VI)
Author: Reis, C
de Andrade, JC
Bruns, RE
Moran, RCCP
Abstract: A kinetic catalytic procedure for the determination of Cr(VI), based on the o-dianisidine oxidation reaction with hydrogen peroxide in a weakly acid medium was optimized with respect to both reactants [HCl, o-dianisidine and H2O2] and solvent composition [mixtures of water, acetone and N, N-dimethylformamide], in order to achieve higher sensitivities. This was accomplished by making use of a split-plot experimental design which permitted simultaneous variations in both mixture and process variables, using a response surface approach. Ten mixture experiments were randomized at each one of the 23 factorial levels and error analysis was performed using a split-plot approach. The optimal mixture [water-acetone 70-30% m/m] and process variables [HCl: 6.0 x 10(-4) mol/l, o-dianisidine: 1.9 x 10(-2) mol/l and H2O2: 0.79 mol/l] values resulted in a significant sensitivity increase compared with a similar procedure described in the literature. (C) 1998 Elsevier Science B.V. All rights reserved.
Subject: split-plot design
factorial design
mixtures design
response surface analysis
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0003-2670(98)00246-3
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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