Novel estimation of the humification degree of soil organic matter by laser-induced breakdown spectroscopy
Nenhuma Miniatura disponível
Data
2014-09-01
Autores
Ferreira, Edilene Cristina [UNESP]
Ferreira, Ednaldo Jose
Villas-Boas, Paulino Ribeiro
Senesi, Giorgio Saverio
Carvalho, Camila Miranda
Romano, Renan Arnon
Martin-Neto, Ladislau
Bastos Pereira Milori, Debora Marcondes
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Soil organic matter (SOM) constitutes an important reservoir of terrestrial carbon and can be considered an alternative for atmospheric carbon storage, contributing to global warming mitigation. Soil management can favor atmospheric carbon incorporation into SUM or its release from SOM to atmosphere. Thus, the evaluation of the humification degree (HD), which is an indication of the recalcitrance of SOM, can provide an estimation of the capacity of carbon sequestration by soils under various managements. The HD of SOM can be estimated by using various analytical techniques including fluorescence spectroscopy. In the present work, the potential of laser-induced breakdown spectroscopy (LIBS) to estimate the HD of SUM was evaluated for the first time. Intensities of emission lines of Al, Mg and Ca from LIBS spectra showing correlation with fluorescence emissions determined by laser-induced fluorescence spectroscopy (LIFS) reference technique were used to obtain a multivaried calibration model based on the k-nearest neighbor (k-NN) method. The values predicted by the proposed model (A-LIBS) showed strong correlation with LIFS results with a Pearson's coefficient of 0.87. The HD of SUM obtained after normalizing A-LIBS by total carbon in the sample showed a strong correlation to that determined by LIFS (0.94), thus suggesting the great potential of LIBS for this novel application. (C) 2014 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Soil organic matter, Humification degree, LIES, LIBS
Como citar
Spectrochimica Acta Part B-atomic Spectroscopy. Oxford: Pergamon-elsevier Science Ltd, v. 99, p. 76-81, 2014.