Effects of laser focusing and fluence on the analysis of pellets of plant materials by laser-induced breakdown spectroscopy

Effects of laser focusing and fluence on the analysis of pellets of plant materials by laser-induced breakdown spectroscopy

Author Arantes de Carvalho, Gabriel Gustinelli Google Scholar
Santos Junior, Dario Autor UNIFESP Google Scholar
Nunes, Lidiane Cristina Google Scholar
Gomes, Marcos da Silva Google Scholar
Leme, Flavio de Oliveira Google Scholar
Krug, Francisco Jose Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de São Carlos (UFSCar)
Abstract The effects of laser focusing and fluence on LIBS analysis of pellets of plant leaves was evaluated. A Q-switched Nd:YAG laser (5ns, 10Hz, 1064nm) was used and the emission signals were collected by lenses into an optical fiber coupled to a spectrometer with Echelle optics and ICCD. Data were acquired from the accumulation of 20 laser pulses at 2.0 mu s delay and 5.0 mu s integration time gate. the emission signal intensities increased with both laser fluence and spot size. Higher sensitivities for Ca, K, Mg, P, Al, B, Cu, Fe, Mn, and Zn determinations were observed for fluences in the range from 25 to 60Jcm(-2). Coefficients of variation of site-to-site measurements were generally lower than 10% (n=30 sites, 20 laser pulses/site) for a fluence of 50Jcm(-2) and 750 mu m spot size. for most elements, there is an indication that accuracy is improved with higher fluences. (C) 2012 Elsevier B.V. All rights reserved.
Keywords Laser-induced breakdown spectroscopy
LIBS
Plant material
Laser focusing
Fluence
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: FAPESP 04/15965-2
FAPESP: 2010/16379-0
FAPESP: 2010/17158-8
CNPq: CNPq 140879/2008-0
CNPq: 140926/2009-7
CNPq: 305913/2009-3
CNPq: 578728/2008-7
CNPq: 309800/2011-0
Date 2012-08-01
Published in Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-Elsevier B.V., v. 74-75, p. 162-168, 2012.
ISSN 0584-8547 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 162-168
Origin http://dx.doi.org/10.1016/j.sab.2012.06.012
Access rights Closed access
Type Article
Web of Science ID WOS:000308775900026
URI http://repositorio.unifesp.br/handle/11600/35141

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