Comparison of Fused Glass Beads and Pressed Powder Pellets for the Quantitative Measurement of Al, Fe, Si and Ti in Bauxite by Laser-Induced Breakdown Spectroscopy

Autor(es)

Carvalho, Alexandrina A. C. ^[1] ; Alves, Victoria C. ^[1] ; Silvestre, Daniel M. ^[1] ; Leme, Flavio O. ^[2] ; Oliveira, Pedro V. ^[1] ; Nomura, Cassiana S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Av Estados 5001, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GEOSTANDARDS AND GEOANALYTICAL RESEARCH; v. 41, n. 4, p. 585-592, DEC 2017.
• Citações Web of Science: 3

Resumo

Due to matrix interference and sample particle size effects, some of the most important and difficult issues in laser-induced breakdown spectroscopy (LIBS) analysis are the calibration and quantitative measurement of a complex matrix. This study proposes the use of borate fusion as an alternative sample preparation procedure for the quantitative measurement of Al, Fe, Si and Ti in bauxite by LIBS. Analytical calibration curves were made using bauxite certified reference materials (CRM), and the precision and accuracy of the methods were evaluated by analysing an additional bauxite CRM, using two different approaches: pressed powder pellets and fused glass beads. The borate fusion method was the most suitable sample preparation technique, since particle size effects and matrix interference could be minimised, obtaining better linearity on the analytical calibration curves (r(2)), and more accurate and more precise results for bauxite analysis. (AU)

• Processo FAPESP: 12/11998-0 - Avaliação e produção de material calibrante sintético visando à análise direta de madeiras por LIBS
• Beneficiário: Cassiana Seimi Nomura
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/13478-6 - Avaliação do efeito de propriedades do laser e da amostra na análise direta de carnes por espectrometria de emissão óptica com plasma induzido por laser (LIBS)
• Beneficiário: Flavio de Oliveira Leme
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado