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Title: Nanoscale mapping of carbon oxidation in pyrogenic black carbon from ancient Amazonian anthrosols
Authors: Archanjo, Bráulio Soares
Baptista, Daniel Lorscheitter
Sena, Lídia Ágata
Cançado, Luiz Gustavo
Falcão, Newton P.S.
Jório, Ado
Achete, Carlos Alberto
Keywords: Black Carbon
Carbonyl Derivative
Carboxyl Group
Phenol Derivative
Soil Organic Matter
Soil Pollutant
Cation Exchange
Chemical Binding
Controlled Study
Electron Energy Loss Spectroscopy
Microscopy, Electron
Plant Stem
Priority Journal
Roentgen Spectroscopy
Microscopy, Electron, Scanning
Scanning Transmission Electron Microscopy
Surface Property
Transmission Electron Microscopy
Environmental Monitoring
Soil Pollutant
Environmental Monitoring
Soil Pollutants
Issue Date: 2015
metadata.dc.publisher.journal: Environmental Sciences: Processes and Impacts
metadata.dc.relation.ispartof: Volume 17, Número 4, Pags. 775-779
Abstract: Understanding soil organic matter is necessary for the development of soil amendments, which are important for sustaining agriculture in humid tropical climates. Ancient Amazonian anthrosols are uniquely high in black recalcitrant carbon, making them extremely fertile. In this study, we use high-resolution electron microscopy and spectroscopy to resolve the oxidation process of carbon in the nanoscale crystallites within the black carbon grains of this special soil. Most alkali and acid chemical extraction methods are known to cause chemical modifications in soil organic matter and to give poor or no information about the real spatial structure of soil aggregates. However, here we show that carbon-oxygen functional groups such as phenol, carbonyl, and carboxyl dominate over different spatial regions, with areas varying from over tens to hundreds of nm2. The chemical maps show that in the nanoscale grain, the surface has a tendency to be less aromatic than the grain core, where higher oxidative-degradation levels are indicated by the presence of carbonyl and carboxyl groups. A deep understanding of these structures could allow artificial reproduction of these natural events. © 2015 The Royal Society of Chemistry.
metadata.dc.identifier.doi: 10.1039/c4em00590b
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