Direct determination of Cu, Cr, and Ni in river sediments using double pulse laser-induced breakdown spectroscopy: Ecological risk and pollution level assessment.

Autor: De Morais CP; São Carlos Institute of Chemistry, University of São Paulo, 13566-590 São Carlos, São Paulo, Brazil; University of Toulon, Aix Marseille University, CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584 83041 Toulon CEDEX 9, France; Embrapa Instrumentation, 13560-970 São Carlos, São Paulo, Brazil. Electronic address: carla.morais@alumni.usp.br., Babos DV; Embrapa Instrumentation, 13560-970 São Carlos, São Paulo, Brazil., Costa VC; Embrapa Instrumentation, 13560-970 São Carlos, São Paulo, Brazil., Neris JB; Department of Chemistry, Federal University of São Carlos, 13565-905 São Carlos, São Paulo, Brazil., Nicolodelli G; Department of Physics, Federal University of Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil., Mitsuyuki MC; Embrapa Instrumentation, 13560-970 São Carlos, São Paulo, Brazil., Mauad FF; São Carlos School of Engineering, University of São Paulo, 13566-590 São Carlos, São Paulo, Brazil., Mounier S; University of Toulon, Aix Marseille University, CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584 83041 Toulon CEDEX 9, France. Electronic address: stephane.mounier@univ-tln.fr., Milori DMBP; Embrapa Instrumentation, 13560-970 São Carlos, São Paulo, Brazil. Electronic address: debora.milori@embrapa.br.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Sep 01; Vol. 837, pp. 155699. Date of Electronic Publication: 2022 May 04.
DOI: 10.1016/j.scitotenv.2022.155699
Abstrakt: Double pulse laser-induced breakdown spectroscopy (DP LIBS) has attracted much attention for analyzing trace elements due to its higher sensitivity when compared to single pulse laser-induced breakdown spectroscopy (SP LIBS). However, the development of quantitative methods in LIBS for the analysis of complex samples, such as sediments, is a great challenge due to the matrix effects that are very accentuated in this technique. In this study, different spectral treatments and calibration strategies were investigated to obtain calibration models that allow determinations with satisfactory accuracy and precision of Cr, Cu, and Ni in river sediments from different hydrographic basins. The best model developed for Cr was using MMC without spectral normalization and for Cu and Ni it was using MMC with spectral normalization, and using inverse regression, an increase in the accuracy of the determinations of all analytes was obtained. These models showed limit of quantification (LOQ) of 7.87 mg kg -1 , 1.62 mg kg -1 , and 2.21 mg kg -1 and root mean square error of prediction (RMSEP) of 7.54 mg kg -1 , 14.53 mg kg -1 , and 8.29 mg kg -1 for Cr, Cu, and Ni, respectively. Therefore, the models have adequate sensitivity and precision for the quantification of the potentially toxic elements (PTEs) evaluated, since, according to Brazilian legislation, the lower concentration of threshold effect level (TEL) for Cr, Cu, and Ni is <37.3 mg kg -1 , <35.7 mg kg -1 , and <18 mg kg -1 , respectively. The concentrations of Cr, Cu, and Ni determined by DP LIBS allowed to obtain a partial ecological risk assessment of the studied sediments. Also, the chemometric tool Kohonen self-organizing map (KSOM) were used for data interpretation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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