The importance of humin in soil characterisation: A study on Amazonian soils using different fluorescence techniques - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Science of the Total Environment Année : 2015

The importance of humin in soil characterisation: A study on Amazonian soils using different fluorescence techniques

Résumé

Soil organic matter (SOM) is a complex mixture of molecules with different physicochemical properties, with humic substances (HS) being the main component as it represents around 20-50% of SOM structure. Soil of the Amazon region is considered one of the larger carbon pools of the world; thus, studies of the humic fractions are important for understanding the dynamics of organic matter (OM) in these soils. The aim of this study was to use laser-induced fluorescence spectroscopy (LIFS) and a combination of excitation-emission matrix (EEM) fluorescence with Parallel Factor Analysis (CP/PARAFAC) to assess the characteristics of humin (HU) extracted from Amazonian soils. The results obtained using LIFS showed that there was an increasing gradient of humification degree with depth, the deeper horizon presenting a higher amount of aromatic groups in the structure of HU. From the EEM, the contribution of two fluorophores with similar behaviour in the structures of HU and whole soil was assessed. Additionally, the results showed that the HU fraction might represent a larger fraction of SOM than previously thought: about 80-93% of some Amazon soils. Therefore, HU is an important humic fraction, thus indicating its role in environmental analysis, mainly in soil analysis.
Fichier non déposé

Dates et versions

hal-01394606 , version 1 (09-11-2016)

Identifiants

Citer

Amanda Maria Tadini, Gustavo Nicolodelli, Stéphane Mounier, Célia Regina Montes, Débora Marcondes Bastos Pereira Milori. The importance of humin in soil characterisation: A study on Amazonian soils using different fluorescence techniques. Science of the Total Environment, 2015, 537, pp.152--158. ⟨10.1016/j.scitotenv.2015.07.125⟩. ⟨hal-01394606⟩

Collections

UNIV-TLN PROTEE
116 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More