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W. N. L. dos Santos
Researcher at Federal University of Bahia
Publications - 6
Citations - 2467
W. N. L. dos Santos is an academic researcher from Federal University of Bahia. The author has contributed to research in topics: Detection limit & Certified reference materials. The author has an hindex of 5, co-authored 6 publications receiving 2047 citations. Previous affiliations of W. N. L. dos Santos include State University of Santa Cruz.
Papers
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Journal ArticleDOI
Box-Behnken design: An alternative for the optimization of analytical methods
Sergio Luis Costa Ferreira,Roy Edward Bruns,Hadla S. Ferreira,Geraldo D. Matos,Jorge Mauricio David,Geovani C. Brandao,E.G.P. da Silva,Lindomar A. Portugal,P.S. dos Reis,Anderson Santos Souza,W. N. L. dos Santos +10 more
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.
Journal ArticleDOI
Application of polyurethane foam as a sorbent for trace metal pre-concentration — A review
Valfredo Azevedo Lemos,Moacy Selis Santos,Elenir Souza Santos,Márcio Souza Santos,W. N. L. dos Santos,W. N. L. dos Santos,Anderson Santos Souza,D.S. de Jesus,C.F. das Virgens,Marcelo Souza de Carvalho,Nédio Oleszczuk,Maria Goreti R. Vale,Bernhard Welz,Bernhard Welz,Sergio Luis Costa Ferreira +14 more
TL;DR: The first publication on the use of polyurethane foam (PUF) for sorption processes dates back to 1970, and soon after the material was applied for separation processes as discussed by the authors.
Journal ArticleDOI
Use of factorial design and Doehlert matrix for multivariate optimisation of an on-line preconcentration system for lead determination by flame atomic absorption spectrometry.
Sergio Luis Costa Ferreira,W. N. L. dos Santos,Marcos A. Bezerra,Marcos A. Bezerra,Valfredo Azevedo Lemos,Valfredo Azevedo Lemos,Juan M. Bosque-Sendra +6 more
TL;DR: The recovery achieved for lead determination in the presence of several cations demonstrated that this procedure has enough selectivity for analysis of environmental samples and was applied toLead determination in natural food.
Journal ArticleDOI
A pre-concentration procedure using coprecipitation for determination of lead and iron in several samples using flame atomic absorption spectrometry.
Sibel Saracoglu,Mustafa Soylak,D.S. Kacar Peker,Latif Elci,W. N. L. dos Santos,Valfredo Azevedo Lemos,Sergio Luis Costa Ferreira +6 more
TL;DR: The proposed pre-concentration procedure for determination of lead and iron in several samples by flame atomic absorption spectrometry successfully applied to the analysis of seawater, urine, mineral water, soil and physiological solution samples and agree well with others data reported in the literature.
Journal ArticleDOI
Application of multivariate technique in method development for the direct determination of copper in petroleum condensate using graphite furnace atomic absorption spectrometry
W. N. L. dos Santos,F. de S. Dias,Marcelo S. Fernandes,Márcio das Virgens Rebouças,Maria Goreti R. Vale,Bernhard Welz,Sergio Luis Costa Ferreira +6 more
TL;DR: In this paper, a method was developed for the direct determination of copper in petroleum condensate using detergentless micro-emulsions (three-component solutions) and graphite furnace atomic absorption spectrometry.