Determination of Pb in soils by double-pulse laser-induced breakdown spectroscopy assisted by continuum wave-diode laser-induced fluorescence

Author(s)

Nicolodelli, Gustavo ^{[1, 2]} ; Villas-Boas, Paulino R. ^[1] ; Menegatti, Carlos R. ^[3] ; Senesi, Giorgio S. ^[4] ; Magalhaes, V, Daniel ; de Souza, Daniele ^[5] ; Milori, Debora M. B. P. ^[1] ; Marangoni, Bruno S. ^[2]

Affiliation

^[1] Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Mato Grosso do Sul, Phys Inst, POB 549, BR-79070900 Campo Grande, MS - Brazil

^[3] Univ Sao Paulo, Sch Engn Lorena, POB 116, BR-12602810 Lorena, SP - Brazil

^[4] CNR, Ist Nanotecnol NANOTEC, PLasMI Lab, Via Amendola 122-D, I-70126 Bari - Italy

^[5] Univ Fed Sao Carlos, Dept Phys, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: APPLIED OPTICS; v. 57, n. 28, p. 8366-8372, OCT 1 2018.
• Web of Science Citations: 7

Abstract

Laser-induced breakdown spectroscopy (LIBS) has attracted a lot of attention due to its potential to rapidly identify and quantify any chemical element with minimal sample preparation. Despite continuous improvements, the sensitivity of this technique still remains a challenge. In order to increase LIBS intensity, a laser-induced fluorescence (LIF) system can be coupled with LIBS to re-excite a transition of the element in the plasma by employing very expensive optical parametric oscillators (OPO). In this work, a homemade tunable continuum wave-diode laser (CW-DL) has been developed and coupled to a double pulse (DP) LIBS system to enhance the sensitivity of Pb detection in a soil sample at the transition 6s(2)6p(2)-P-3(2) -> 6s(2)6p7s-P-3(1) at 405.78 nm. Before sample analysis, the production of no scattered light by the plasma was ascertained, and the optimal temperature of 10,000 K was estimated for this transition, feasible to be achieved in DP-LIBS systems. An increase of approximately 100% for the Pb I transition at 405.78 nm was obtained by DP-LIBS-CW-DL-LIF with respect to the DP-LIBS system alone. This result opens a new promising line of research to improve LIBS sensitivity using the CW-DL approach. (C) 2018 Optical Society of America (AU)

• FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
• Grantee: Vanderlei Salvador Bagnato
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 17/19248-3 - Using the LIBS technique for the study of heavy metals in leachate liquid samples
• Grantee: Carlos Renato Menegatti
• Support Opportunities: Regular Research Grants