Sergio Luis Costa Ferreira

TL;DR: The present paper describes fundamentals, advantages and limitations of the Box-Behnken design for the optimization of analytical methods, and establishes also a comparison between this design and composite central, three-level full factorial and Doehlert designs.

TL;DR: The surface response methodologies: central composite design, Doehlert matrix and Box-Behnken design are discussed and applications of these techniques for optimization of sample preparation steps and determination of experimental conditions for chromatographic separations are presented.

TL;DR: A review of the use of the Doehlert matrix as a chemometric tool for the optimization of methods in analytical chemistry and other sciences is presented and 57 references concerning the application of DoehLert matrices in the optimized procedures involving spectroanalytical, electroanalytical and chromatographic techniques are considered.

TL;DR: Cloud point extraction is a separation and preconcentration procedure that has been extensively applied for trace metal determination in several different matrices as discussed by the authors, and its major advantages are simple experimental procedures, low cost, high preconconcentration factors, and environmental safety.

TL;DR: In this paper, a review of standard methods and other analytical methods suggested for analysis of biodiesel is presented, and the methods of analysis are divided into groups according to information that may be provided on the contaminants from the raw material of the production process, the molecular structures of the biodiesel and its degradation during storage.