Laser-induced breakdown spectroscopy (LIBS) spectra interpretation and characterization using parallel factor analysis (PARAFAC): a new procedure for data and spectral interference processing fostering the waste electrical and electronic equipment (WEEE) recycling process

Autor(es)

Castro, Jeyne Pricylla ^{[1, 2]} ; Pereira-Filho, Edenir Rodrigues ^[1] ; Bro, Rasmus ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Chem Dept, Grp Appl Instrumental Anal, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Copenhagen, Dept Food Sci, Copenhagen - Denmark

• Tipo de documento: Artigo Científico
• Fonte: Journal of Analytical Atomic Spectrometry; v. 35, n. 6, p. 1115-1124, JUN 1 2020.
• Citações Web of Science: 0

Resumo

Laser-induced breakdown spectroscopy (LIBS) was used to characterize base (Al and Cu) and noble (Au and Ag) elements on a printed circuit board (PCB) from a hard disk (HD). A PCB was cut into 77 fragments, and a matrix of 4 rows and 4 columns with 10 laser pulses in each point of the matrix was acquired in each fragment by LIBS. For each element, a spectral range was selected with its respective emission lines and Parallel Factor Analysis (PARAFAC) was used to model the data. LIBS spectra are two-way data, but in this case, the depths were used as a third mode being the data set: samples x variables (emission lines) x depths (laser pulses from 1 to 10). PARAFAC was able to model spectral interference and analyte emission lines in separate components, which allows the removal of the contribution of the concomitants from the measured data. The scores (relative concentrations, mode 1) of the component of interest were used to create a map of the PCB colored by relative concentration, and it was possible to visualize where the element is predominantly located on the PCB. In addition, classification models were applied for Au and Ag using partial least squares discriminant analysis (PLSDA) after removal of the interferents using the PARAFAC result. Good figures of merit were obtained for calibration, cross-validation and validation data sets with accuracy ranging from 0.94 to 1.00. Therefore, the use of PARAFAC and LIBS spectra was very useful, being a great contribution to the LIBS community and urban mining. (AU)

• Processo FAPESP: 16/01513-0 - Combinação de LIBS (Laser-Induced Breakdown Spectroscopy) e ICP OES (Inductively Coupled Plasma Optical Emission Spectrometry) na análise de amostras de resíduo eletrônico (circuito eletrônico e polímeros), alimentos e líquidas de difícil preparação
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/50827-6 - Readequação física dos laboratórios do grupo de análise instrumental aplicada (Gaia) para a proposição de métodos analíticos de análise de lixo eletrônico e de cosméticos
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/17221-8 - Avaliação da composição de discos rígidos de lixo eletrônico por meio de técnicas espectroanalíticas: determinação de elementos preciosos e terras raras
• Beneficiário: Jeyne Pricylla Castro Castilho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/17753-5 - Laser-induced breakdown spectroscopy (LIBS) e ferramentas quimiométricas: simulação da análise direta e classificação de fragmentos de placas de circuito impresso de disco rígido
• Beneficiário: Jeyne Pricylla Castro Castilho
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 14/22408-4 - Utilização da técnica Laser-Induced Breakdown Spectroscopy (LIBS) para análise direta de amostras de ligas metálicas
• Beneficiário: Jeyne Pricylla Castro Castilho
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/01769-3 - Desenvolvimento de métodos espectroanalíticos para a análise direta de amostras de lixo eletrônico e de cosméticos
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular