QUALITATIVE AND QUANTITATIVE ANALYSIS OF SOILS USING LASER-INDUCED BREAKDOWN SPECTROSCOPY AND CHEMOMETRICS TOOLS
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 µs) and fluence at five levels (1448, 1811, 2659, 3514, and 3820 J·cm–2). The best results obtained were with a delay time of 1.2 μs and fluence of 2659 J·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.
Supporting agencies: This study was supported by the São Paulo Research Foundation (FAPESP, 2016/01513-0) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 401074/2014-5, 305637/2015-0, and 160152/2015-1). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.
About the Authors
V. C. Costa
Federal University of São Carlos; Federal University of Alfenas (Unifal)
Brazil
Brazil
Group of Applied Instrumental Analysis, Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo State 13565-905;
Laboratory of Toxicant and Drug Analyses (LATF), Federal University of Alfenas (Unifal),
Alfenas, Minas Gerais State 37130-000
S. dos Santos Ferreira
State University of Santa Cruz
Brazil
Ilhéus, Bahia State 45662-900
Brazil
Ilhéus, Bahia State 45662-900
L. N. Santos
State University of Santa Cruz
Brazil
Ilhéus, Bahia State 45662-900
Brazil
Ilhéus, Bahia State 45662-900
M. A. Sperança
Federal University of São Carlos
Brazil
Brazil
Group of Applied Instrumental Analysis, Department of Chemistry
São Carlos, São Paulo State 13565-905C. Santos da Silva
Federal University of São Carlos
Brazil
Brazil
Group of Applied Instrumental Analysis, Department of Chemistry
São Carlos, São Paulo State 13565-905G. A. Sodré
State University of Santa Cruz
Brazil
Ilhéus, Bahia State 45662-900
Brazil
Ilhéus, Bahia State 45662-900
E. R. Pereira-Filho
Federal University of São Carlos
Brazil
Brazil
Group of Applied Instrumental Analysis, Department of Chemistry
São Carlos, São Paulo State 13565-905References
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Review
For citations:
Costa V.C., dos Santos Ferreira S., Santos L.N., Sperança M.A., Santos da Silva C., Sodré G.A., Pereira-Filho E.R. QUALITATIVE AND QUANTITATIVE ANALYSIS OF SOILS USING LASER-INDUCED BREAKDOWN SPECTROSCOPY AND CHEMOMETRICS TOOLS. Zhurnal Prikladnoii Spektroskopii. 2020;87(2):348(1)-348(9).
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