Application of Laser-Induced Breakdown Spectroscopy and Hyperspectral Images for Direct Evaluation of Chemical Elemental Profiles of Coprolites

Autor(es)

Speranca, Marco Aurelio ; Batista de Aquino, Francisco Wendel ; Fernandes, Marcelo Adorna ; Lopez-Castillo, Alejandro ; Carneiro, Renato Lajarim ; Pereira-Filho, Edenir Rodrigues

• Tipo de documento: Artigo Científico
• Fonte: GEOSTANDARDS AND GEOANALYTICAL RESEARCH; v. 41, n. 2, p. 273-282, JUN 2017.
• Citações Web of Science: 6

Resumo

This study demonstrates the application of laser-induced breakdown spectroscopy (LIBS) and hyperspectral imaging to the investigation of coprolite and fossil samples. Solid samples from the Permian (seven coprolites and one fossil), Cretaceous (one coprolite) and Oligo-Miocene (two coprolites) periods were directly analysed, and emission spectra from 186 to 1042nm were obtained in several areas covering coprolite/fossil and rock material. Initial exploratory analyses were performed using principal component analysis with the data set normalised by the norm (Euclidean norm = 1). After identification and selection of emission lines of eleven elements (Al, Ca, Cr, Fe, K, Mg, Mn, Na, Ni, P and Si), the signals were normalised again by the relative intensity of the selected element. Phosphorus was identified mainly in the coprolites, while K and Na were primarily found in the rock material. In several cases, there was a positive correlation between Ca and P. A sample from the Oligo-Miocene series was also analysed using inductively coupled plasma-optical emission spectrometry (ICP-OES) (rock and coprolites were analysed separately). Based on the quantitative results from ICP-OES, it was confirmed that the tendency was the same as that observed with the results obtained from LIBS directly in the solid sample. (AU)

• 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: 13/04688-7 - Desenvolvimento de métodos espectroanalíticos para a determinação direta de elementos tóxicos em materiais poliméricos de lixo eletrônico por emissão em plasma induzido por laser (LIBS)
• Beneficiário: Francisco Wendel Batista de Aquino
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• 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