Evaluation of the effect of laser and sample properties in the direct analysis of ...
| Full text | |
| Author(s): |
Speranca, Marco Aurelio
;
Batista de Aquino, Francisco Wendel
;
Fernandes, Marcelo Adorna
;
Lopez-Castillo, Alejandro
;
Carneiro, Renato Lajarim
;
Pereira-Filho, Edenir Rodrigues
Total Authors: 6
|
| Document type: | Journal article |
| Source: | GEOSTANDARDS AND GEOANALYTICAL RESEARCH; v. 41, n. 2, p. 273-282, JUN 2017. |
| Web of Science Citations: | 6 |
| Abstract | |
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) | |
| FAPESP's process: | 12/01769-3 - Development of spectroanalytical methods for direct analysis of waste electrical and electronic equipments and cosmetics |
| Grantee: | Edenir Rodrigues Pereira Filho |
| Support type: | Regular Research Grants |
| FAPESP's process: | 13/04688-7 - Development of spectroanalytical methods for direct determination of toxic elements in polymeric materials of electronic waste by Laser-Induced Breakdown Spectroscopy |
| Grantee: | Francisco Wendel Batista de Aquino |
| Support type: | Scholarships in Brazil - Post-Doctorate |