Laser-induced breakdown spectroscopy and chemometrics for classification of toys relying on toxic elements

Autor(es)

Godoi, Quienly ^{[1, 2]} ; Leme, Flavio O. ^[2] ; Trevizan, Lilian C. ^[2] ; Pereira Filho, Edenir R. ^[1] ; Rufini, Iolanda A. ^[2] ; Santos, Jr., Dario ^[3] ; Krug, Francisco J. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Ctr Eneria Nucl Agr, BR-13416000 Piracicaba, SP - Brazil

^[3] Univ Fed Sao Paulo, UNIFESP, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY; v. 66, n. 2, p. 138-143, FEB 2011.
• Citações Web of Science: 39

Resumo

Quality control of toys for avoiding children exposure to potentially toxic elements is of utmost relevance and it is a common requirement in national and/or international norms for health and safety reasons. Laser-induced breakdown spectroscopy (LIBS) was recently evaluated at authors' laboratory for direct analysis of plastic toys and one of the main difficulties for the determination of Cd. Cr and Pb was the variety of mixtures and types of polymers. As most norms rely on migration (lixiviation) protocols, chemometric classification models from LIBS spectra were tested for sampling toys that present potential risk of Cd, Cr and Pb contamination. The classification models were generated from the emission spectra of 51 polymeric toys and by using Partial Least Squares - Discriminant Analysis (PLS-DA), Soft Independent Modeling of Class Analogy (SIMCA) and K-Nearest Neighbor (KNN). The classification models and validations were carried out with 40 and 11 test samples, respectively. Best results were obtained when KNN was used, with corrected predictions varying from 95% for Cd to 100% for Cr and Pb. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/01052-3 - Avaliação da espectrometria de emissão óptica com plasma induzido por laser para determinação de Ba, Cd, Cr, Pb e Sb em brinquedos
• Beneficiário: Quienly Godoi
• Modalidade de apoio: Bolsas no Brasil - Doutorado