Evaluation of the roles of metals and humic fractions in the podzolization of soils from the Amazon region using two analytical spectroscopy techniques

Autor(es)

Tadini, Amanda M. ^{[1, 2, 3]} ; Nicolodelli, Gustavo ^[4] ; Marangoni, Bruno S. ^[4] ; Mounier, Stephane ^[3] ; Montes, Celia R. ^{[5, 6]} ; Milori, Debora M. B. P. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentat, Sao Carlos, SP - Brazil

^[3] Univ Toulon & Var, Lab PROTEE, EA3819, CS 60584, F-83041 Toulon 9 - France

^[4] Univ Fed Mato Grosso do Sul, Inst Phys, POB 549, BR-79070900 Campo Grande, MS - Brazil

^[5] Univ Sao Paulo, Ctr Energia Nucl Agr, Piracicaba, SP - Brazil

^[6] Univ Sao Paulo, Nucleo Pesquisa Geoquim & Geofis Litosfera, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 144, p. 454-460, JAN 2019.
• Citações Web of Science: 2

Resumo

Soil organic matter (SOM) plays an important role in environmental sustainability, since it is involved in carbon and nutrient cycling. Consequently, it is a key factor to consider in studies concerning global climate change and agronomy. Among the main components of SOM are humic substances (HS), which are divided, according to their solubility, into humic acid (HA), fulvic acid (FA), and humin (HU) fractions. Study of the chemical properties of this organic matter is important for understanding the biogeochemical processes occurring in the soil. The aim of this work was to determine the metals iron (Fe) and aluminum (Al), using flame atomic absorption spectrometry (FAAS) and laser-induced breakdown spectroscopy (LIBS), in order to elucidate the role of organic matter in the transport of these metals in Amazonian soils. The results showed that FA was important for Al, while the HA fraction was more selective towards Fe. The translocations of these metals to deeper profiles in two different soils involved either young and less humified organic matter, or older organic matter with a low degree of humification. Therefore, these two humic fractions were involved in the process of soil podzolization, with FA having a predominant role in the transport of Al, while HA was mainly responsible for the transport of Fe. (AU)

• Processo FAPESP: 13/13013-3 - Caracterização das substâncias húmicas extraídas de solos da região amazônica
• Beneficiário: Amanda Maria Tadini
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/03250-2 - Quantificação e dinâmica do carbono associado a horizontes espódicos profundos de solos da Floresta Amazônica, face a possíveis mudanças climáticas
• Beneficiário: Célia Regina Montes
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 12/51469-6 - Modelling the dynamics of equatorial forest soil deep carbon in changing environments - C-PROFOR
• Beneficiário: Adolpho José Melfi
• Linha de fomento: Auxílio à Pesquisa - Temático