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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modeling the quenching of fluorescence from organic matter in Amazonian soils

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Author(s):
Tadini, Amanda Maria [1, 2, 3] ; Mounier, Stephane [3] ; Bastos Pereira Milori, Debora Marcondes [2]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, Sao Carlos, SP - Brazil
[2] EMBRAPA Agr Instrumentat, Sao Carlos, SP - Brazil
[3] Univ Toulon & Var, Lab MIO, Equipe CEM, CS 60584, F-83041 Toulon 9 - France
Total Affiliations: 3
Document type: Journal article
Source: Science of The Total Environment; v. 698, JAN 1 2020.
Web of Science Citations: 0
Abstract

Knowledge of the interactions of soil organic matter (SOM) with metal species is important in order to obtain information concerning the fates of the metals in environment, whose reactive functional groups present in SOM can provide high complexation capacity. The aim of this study was to evaluate the interactions involving humic acids (HA) and fulvic acids (FA), extracted from Amazonian soils, with Cu(II) and Al (III) ions, using fluorescence quenching spectroscopy. The obtained results showed that the data for the humic fractions of the Amazonian Spodosols could be fitted with one to one complexation model, which provided the best representation of the changes in fluorescence quenching after addition of Cu(II) or Al (III) ions. It was found that the HA presented fewer complexation sites and lower stability constants, compared to the FA samples. Furthermore, the FA showed selective interaction with the metals, while the HA fraction was less selective and could be associated its homogeneous structure. The results showed that the humic acids required 10 times more carbon in their structures than fulvic acids for complexing a metal atom. This behavior can be associated to the fact that the Fulvic Acid fraction has higher mobility and greater interaction during the profile when compare humic acids. Hence, given the diversity of metals to which the HA has affinity, this soil fraction appears to be mainly responsible for soil fertility, while the FA fraction has higher mobility and greater interaction with water. (C) 2019 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/13013-3 - Characterization Humic Substances extracted from Amazonian Soils
Grantee:Amanda Maria Tadini
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 11/03250-2 - Quantification and dynamics of carbon associated with deep spodic horizons of Amazon Forest soils, towards possible climatic changed
Grantee:Célia Regina Montes
Support Opportunities: Regular Research Grants
FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
Grantee:Vanderlei Salvador Bagnato
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/51469-6 - Modelling the dynamics of equatorial forest soil deep carbon in changing environments - C-PROFOR
Grantee:Adolpho José Melfi
Support Opportunities: Research Projects - Thematic Grants