期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 66, 期 2, 页码 138-143出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2011.01.001
关键词
LIBS; ICP OES; Chemometrics; Toys; Toxic elements; Classification models
类别
资金
- FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) [07/01052-3]
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [578728/2008-7, 305913/2009-3, 140879/2008-0, 304060/2009-7]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [07/01052-3] Funding Source: FAPESP
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.
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