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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Qualitative and Quantitative Analysis of Soils Using Laser-Induced Breakdown Spectroscopy and Chemometrics Tools

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Author(s):
Costa, V. C. [1, 2] ; Ferreira, S. dos Santos [3] ; Santos, L. N. [3] ; Speranca, M. A. [1] ; da Silva, C. Santos [1] ; Sodre, G. A. [3] ; Pereira-Filho, E. R. [1]
Total Authors: 7
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, BR-13565905 Sao Carlos, SP - Brazil
[2] Fed Univ Alfenas Unifal, Lab Toxicant & Drug Anal LATF, BR-37130000 Alfenas, MG - Brazil
[3] Univ Estadual Santa Cruz, BR-45662900 Ilheus, BA - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Spectroscopy; v. 87, n. 2, p. 378-386, MAY 2020.
Web of Science Citations: 0
Abstract

In the present work a method was proposed for the direct determination of Ca, Fe, K, and Mg and qualitative analysis of anthropized and cabruca soil samples from different depths (0-20 and 20-40 cm) by laser-induced breakdown spectroscopy (LIBS). The LIBS instrumental parameters were evaluated using a central composite design with a central point. The variables evaluated were as follows: delay time in five levels (0.5, 0.7, 1.2, 1.7, and 1.9 mu s) and fluence at five levels (1448, 1811, 2659, 3514, and 3820 J center dot cm(-2)). The best results obtained were with a delay time of 1.2 mu s and fluence of 2659 J x cm(-2). The proposed calibration model for Ca, Fe, K, and Mg obtained using LIBS data presented a good correlation with the reference values obtained by inductively coupled plasma atomic emission spectrometry (ICP OES). In addition, multivariate data analysis from LIBS spectra in the region of 186-1042 nm was performed using principal component analysis (PCA). From the LIBS spectra it was possible to discriminate the different analyzed samples, showing that the combination of LIBS with PCA is an excellent option for the discrimination of soils. (AU)

FAPESP's process: 16/01513-0 - Laser-Induced Breakdown Spectroscopy (LIBS) application in the analyses of electronic waste (printed circuit boards and polymers), food and difficult preparation liquid samples
Grantee:Edenir Rodrigues Pereira Filho
Support Opportunities: Regular Research Grants