Determination of inorganic nutrients in wheat flour by laser-induced breakdown spectroscopy and energy dispersive X-ray fluorescence spectrometry

Determination of inorganic nutrients in wheat flour by laser-induced breakdown spectroscopy and energy dispersive X-ray fluorescence spectrometry

Author Peruchi, Lidiane Cristina Google Scholar
Nunes, Lidiane Cristina Google Scholar
Arantes de Carvalho, Gabriel Gustinelli Google Scholar
Bueno Guerra, Marcelo Braga Google Scholar
Almeida, Eduardo de Google Scholar
Rufini, Iolanda Aparecida Google Scholar
Santos, Dario Autor UNIFESP Google Scholar
Krug, Francisco Jose Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Laser-induced breakdown spectroscopy (LIBS) and energy dispersive X-ray fluorescence spectrometry (EDXRF) were evaluated for the determination of P, K, Ca, Mg, S, Fe, Cu, Mn and Zn in pressed pellets of wheat flours. EDXRF and LIBS calibration models were built with analytes mass fractions determined by inductively coupled plasma optical emission spectrometry after microwave-assisted acid digestion in a set of 25 wheat flour laboratory samples. Test samples consisted of pressed pellets prepared from wheat flour mixed with 30% mm-1 cellulose binder. Experiments were carried out with a LIBS setup consisted of a Q-switched Nd:YAG laser and a spectrometer with Echelle optics and ICCD, and a benchtop EDXRF system fitted with a Rh target X-ray tube and a Si(Li) semiconductor detector. the correlation coefficients from the linear calibration models of P, K, Ca, Mg, S, Fe, Mn and Zn determined by LIBS and/or EDXRF varied from 0.9705 for Zn to 0.9990 for Mg by LIBS, and from 0.9306 for S to 0.9974 for K by EDXRF. the coefficients of variation of measurements varied from 1.2 to 20% for LIBS, and from 03 to 24% for EDXRF. the predictive capabilities based on RMSEP (root mean square error of prediction) values were appropriate for the determination of P, Ca, Mg, Fe, Mn and Zn by LIBS, and for P, K, S, Ca, Fe, and Zn by EDXRF. in general, results from the analysis of NIST SRM 1567a Wheat flour by LIBS and EDXRF were in agreement with their certified mass fractions. (C) 2014 Elsevier B.V. All rights reserved.
Keywords Laser-induced breakdown spectroscopy
X-ray fluorescence spectrometry
Wheat flour
Pellet
Nutrient
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2010/16379-0
FAPESP: 2010/17158-8
FAPESP: 2012/16203-5
CNPq: 578728/2008-7
CNPq: 140926/2009-7
CNPq: 305913/2009-3
CNPq: 309800/2011-0
CNPq: 482500/2011-5
CNPq: 145581/2011-0
Date 2014-10-01
Published in Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-Elsevier B.V., v. 100, p. 129-136, 2014.
ISSN 0584-8547 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 129-136
Origin http://dx.doi.org/10.1016/j.sab.2014.08.025
Access rights Closed access
Type Article
Web of Science ID WOS:000343853400021
URI http://repositorio.unifesp.br/handle/11600/38295

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