Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 74-75, Issue -, Pages 162-168Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2012.06.012
Keywords
Laser-induced breakdown spectroscopy; LIBS; Plant material; Laser focusing; Fluence
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [FAPESP 04/15965-2, 2010/16379-0, 2010/17158-8]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq 140879/2008-0, 140926/2009-7, 305913/2009-3, 578728/2008-7, 309800/2011-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/17158-8] Funding Source: FAPESP
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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.
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