F
Fábio Luiz Melquiades
Researcher at Universidade Estadual de Londrina
Publications - 87
Citations - 858
Fábio Luiz Melquiades is an academic researcher from Universidade Estadual de Londrina. The author has contributed to research in topics: Partial least squares regression & Chemistry. The author has an hindex of 15, co-authored 74 publications receiving 660 citations. Previous affiliations of Fábio Luiz Melquiades include University of the West & State University of Campinas.
Papers
More filters
Journal ArticleDOI
Application of XRF and field portable XRF for environmental analysis
TL;DR: In this paper, the real potential of XRF technique for environmental analysis is evaluated on the basis of published papers, and the determination of heavy metal pollution in water is given for determination.
Journal ArticleDOI
Correction for the effect of soil moisture on in situ XRF analysis using low‐energy background
TL;DR: In this article, the authors proposed a method to correct the effect of soil moisture on in situ XRF analysis using low-energy background, after which a simple calibration is required, and a long drying procedure is not necessary before measuring the samples.
Journal ArticleDOI
Titanium dioxide determination in sunscreen by energy dispersive X-ray fluorescence methodology.
Fábio Luiz Melquiades,Diego de Dio Ferreira,Carlos Roberto Appoloni,Fábio Lopes,Audrey Alesandra Stinghen Garcia Lonni,Fernanda Midori de Oliveira,J.C. Duarte +6 more
TL;DR: The objective of this work is to estimate TiO(2) concentration, without sample preparation, employing a portable energy dispersive X-ray fluorescence (EDXRF) system, aiming to estimate the sun protection factor (SPF) due to the physical barrier in sunscreen composition, and also identify the metals present in the samples.
Journal ArticleDOI
Factorial design for Fe, Cu, Zn, Se and Pb preconcentration optimization with APDC and analysis with a portable X-ray fluorescence system
Fábio Luiz Melquiades,P. S. Parreira,Maria Josefa Santos Yabe,Marcela Zanetti Corazza,R. Funfas,Carlos Roberto Appoloni +5 more
TL;DR: The objective of this work is to use factorial design to optimize the factors involved in the preconcentration process of heavy metals using APDC, and to achieve satisfactory results for in situ survey employing a portable instrument.
Journal ArticleDOI
Effect of X-Ray Tube Configuration on Measurement of Key Soil Fertility Attributes with XRF
Tiago Rodrigues Tavares,José Paulo Molin,Lidiane Cristina Nunes,Elton Eduardo Novais Alves,Fábio Luiz Melquiades,Hudson Wallace Pereira de Carvalho,Abdul Mounem Mouazen +6 more
TL;DR: Assessment of the performance of a portable XRF (XRF) sensor set up with two different X-ray tube configurations to predict nine key soil fertility attributes shows that although X-rays tube configuration affected the intensity of the emission lines of the different elements detected, it did not influence the prediction accuracy of the studied key fertility attributes.