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Type: Artigo de periódico
Title: Experimento didático de quimiometria para planejamento de experimentos: avaliação das condições experimentais na determinação espectrofotométrica de ferro II com o-fenantrolina. Um tutorial, parte III
Title Alternative: A didactic chemometrics experiment for design of experiments (doe): evaluation of experimental conditions in the spectrophotometric determination of iron II with o-phenanthroline. a tutorial, part III
Author: Breitkreitz, Márcia Cristina
Souza, André Marcelo de
Poppi, Ronei Jesus
Abstract: The objective of this manuscript is to describe a practical experiment that can be employed for teaching concepts related to design of experiments using Matlab or Octave computing environment to beginners, undergraduate and graduate students. The classical experiment for determination of Fe (II) using o-phenanthroline was selected because it is easy to understand, and all the required materials are readily available in most analytical laboratories. The approach used in this tutorial is divided in two steps: first, the students are introduced to the concept of multivariate effects, how to calculate and interpret them, and the construction and evaluation of a linear model to describe the experimental domain by using a 2³ factorial design. Second, an extension of the factorial design by adding axial points is described, thereby, providing a central composite design. The quadratic model is then introduced and used to build the response surface.
Subject: design of experiments
multivariate optimization
teaching experiment
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.5935/0100-4042.20140092
Date Issue: 1-Jun-2014
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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