| Texto completo | |
| Autor(es): |
Nicolodelli, Gustavo
[1]
;
Senesi, Giorgio Saverio
[2]
;
Romano, Renan Amon
[1, 3]
;
de Oliveira Perazzoli, Ivan Luiz
[1]
;
Bastos Pereira Milori, Debora Marcondes
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil
[2] CNR, Inst Inorgan Methodol & Plasmas, I-70126 Bari - Italy
[3] Univ Sao Paulo, Phys Inst Sao Carlos, IFSC USP, BR-13566590 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 111, p. 23-29, SEP 1 2015. |
| Citações Web of Science: | 27 |
| Resumo | |
Laser-induced breakdown spectroscopy (LIBS) is a well-known consolidated analytical technique employed successfully for the qualitative and quantitative analysis of solid, liquid, gaseous and aerosol samples of very different nature and origin. Several techniques, such as dual-pulse excitation setup, have been used in order to improve LIBS's sensitivity. The purpose of this paper was to optimize the key parameters as excitation wavelength, delay time and interpulse, that influence the double pulse (DP) LIBS technique in the collinear beam geometry when applied to the analysis at atmospheric air pressure of soil samples of different origin and texture from extreme regions of Brazil. Additionally, a comparative study between conventional single pulse (SP) LIBS and DP LIBS was performed. An optimization of DP LIBS system, choosing the correct delay time between the two pulses, was performed allowing its use for different soil types and the use of different emission lines. In general, the collinear DP LIBS system improved the analytical performances of the technique by enhancing the intensity of emission lines of some elements up to about 5 times, when compared with conventional SP-LIBS, and reduced the continuum emission. Further, the IR laser provided the best performance in re-heating the plasma. (C) 2015 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 12/24349-0 - Desenvolvimento e avaliação de um sistema LIBS com pulso duplo: Aplicação em caracterização de solos |
| Beneficiário: | Gustavo Nicolodelli |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |