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Title: Chemical analysis and molecular models for calcium-oxygen-carbon interactions in black carbon found in fertile amazonian anthrosoils
Authors: Archanjo, Bráulio Soares
Araújo, Joyce R.
Silva, Alexander M.
Capaz, Rodrigo B.
Falcão, Newton P.S.
Jório, Ado
Achete, Carlos Alberto
Keywords: Calcium
Climate Change
Infrared Spectroscopy
Molecular Modeling
Molecular Oxygen
Transmission Electron Microscopy
X Ray Photoelectron Spectroscopy
X Ray Spectroscopy
Amazonian Dark Earths
Anthropogenic Soils
Climate Condition
Energy Dispersive X Ray Spectroscopy
Fourier Transformed Infrared Spectroscopy
Material Science
Mean Residence Time
Scanning Transmission Electron Microscopy
Black Carbon
Calcium Oxide
Soil Organic Matter
Anthropogenic Source
Black Carbon
Chemical Analysis
Climate Change
Food Production
Humid Tropics
Molecular Analysis
Soil Fertility
Soil Pollution
Cation Exchange
Chemical Bond
Climate Change
Density Functional Theory
Food Industry
Humic Substance
Infrared Spectroscopy
Molecular Interaction
Scanning Transmission Electron Microscopy
Soil Chemistry
Soil Fertility
X Ray Photoelectron Spectroscopy
Models, Molecular
Molecular Conformation
Photoelectron Spectroscopy
Spectrometry, X-ray Emission
Issue Date: 2014
metadata.dc.publisher.journal: Environmental Science and Technology
metadata.dc.relation.ispartof: Volume 48, Número 13, Pags. 7445-7452
Abstract: Carbon particles containing mineral matter promote soil fertility, helping it to overcome the rather unfavorable climate conditions of the humid tropics. Intriguing examples are the Amazonian Dark Earths, anthropogenic soils also known as "Terra Preta de Índio (TPI), in which chemical recalcitrance and stable carbon with millenary mean residence times have been observed. Recently, the presence of calcium and oxygen within TPI-carbon nanoparticles at the nano- and mesoscale ranges has been demonstrated. In this work, we combine density functional theory calculations, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, Fourier transformed infrared spectroscopy, and high resolution X-ray photoelectron spectroscopy of TPI-carbons to elucidate the chemical arrangements of calcium-oxygen-carbon groups at the molecular level in TPI. The molecular models are based on graphene oxide nanostructures in which calcium cations are strongly adsorbed at the oxide sites. The application of material science techniques to the field of soil science facilitates a new level of understanding, providing insights into the structure and functionality of recalcitrant carbon in soil and its implications for food production and climate change. © 2014 American Chemical Society.
metadata.dc.identifier.doi: 10.1021/es501046b
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