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

Autor(es)

Peruchi, Lidiane Cristina ^[1] ; Nunes, Lidiane Cristina ^[1] ; Arantes de Carvalho, Gabriel Gustinelli ^[1] ; Bueno Guerra, Marcelo Braga ^[1] ; de Almeida, Eduardo ^[1] ; Rufini, Iolanda Aparecida ^[1] ; Santos, Jr., Dario ^[2] ; Krug, Francisco Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, NAPTISA Res Support Ctr Technol & Innovat Sustain, BR-13416000 Piracicaba, SP - Brazil

^[2] Univ Fed Sao Paulo, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 100, p. 129-136, OCT 1 2014.
• Citações Web of Science: 28

Resumo

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. (AU)

• Processo FAPESP: 10/16379-0 - Estratégias de microamostragem para a análise de tecidos biológicos por espectrometria de emissão óptica com plasma induzido por laser
• Beneficiário: Gabriel Gustinelli Arantes de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/17158-8 - Avaliação da espectrometria de emissão óptica com plasma induzido por laser (LIBS) para determinação de contaminantes inorgânicos em fertilizantes agrícolas
• Beneficiário: Lidiane Cristina Nunes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/16203-5 - Estratégias para análise direta de folhas de cana-de-açúcar por espectrometria de emissão óptica com plasma induzido por laser (LIBS)
• Beneficiário: Marcelo Braga Bueno Guerra
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado