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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.)

Multi-energy calibration and sample fusion as alternatives for quantitative analysis of high silicon content samples by laser-induced breakdown spectrometry

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Author(s):
Carvalho, Alexandrina A. C. [1] ; Cozer, Larissa A. [1] ; Luz, Maciel S. [2] ; Nunes, Lidiane C. [3] ; Roche, Fabio R. P. [3] ; Nomura, Cassiana S. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[2] Ctr Tecnol Met & Mat, Inst Pesquisas Tecnol, Av Prof Almeida Prado 532, BR-05508901 Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Ctr Energia Nucl Agr, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Analytical Atomic Spectrometry; v. 34, n. 8, p. 1701-1707, AUG 1 2019.
Web of Science Citations: 1
Abstract

Calibration aiming at quantitative analysis of complex samples is one of the most difficult issues in laser-induced breakdown spectroscopy (LIBS) due to matrix interferences, heterogeneity, and sample particle size effects. The multi-energy calibration (MEC) method was proposed aiming at simplifying the calibration process in atomic spectrometric techniques and making matrix matching feasible. MEC requires preparation of standards by mixing sample aliquots with either a blank or a reference solution, which is not easy to perform for solid samples, especially when complex matrices are involved. In particular for LIBS, this strategy can be hindered by sample heterogeneity and differences in particle size distribution. In turn, sample preparation by fusion is an interesting approach to minimize these drawbacks. In this context, this work proposed MEC and borate fusion as alternatives for quantitative analysis of high silicon content samples by LIBS. Boron and lithium, constituents of the flux, were used as internal standards (ISs) aiming at minimizing strong absorption effects caused by matrix components and improving the accuracy of the results. The accuracy and precision of MEC-LIBS was demonstrated by determining Al2O3, Fe2O3, and TiO2 in SRM 2703 (sediment for solid sampling) and SRM 679 (brick clay); relative errors from -4 to 15% and relative standard deviations (RSD) between 4.0 and 7.0% were attained, showing that the approach is feasible for quantitative analysis of complex samples. The limits of detection were between 0.4 and 0.6% for all analytes. (AU)

FAPESP's process: 14/50951-4 - INCT 2014: Advanced Analytical Technologies
Grantee:Celio Pasquini
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/10346-2 - Method development for direct quantitative analysis of high silicon content samples: laser-induced breakdown spectrometry and Total Reflection X-Ray Fluorescence
Grantee:Cassiana Seimi Nomura
Support type: Regular Research Grants
FAPESP's process: 12/11998-0 - Evaluation and production of synthetic calibrating material for direct analysis of wood by LIBS
Grantee:Cassiana Seimi Nomura
Support type: Regular Research Grants