Artigo

Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles

Small-scale heterogeneity of organic carbon (C) forms in soils is poorly quantified since appropriate analytical techniques were not available up to now. Specifically, tools for the identification of functional groups on the surface of micrometer-sized black C particles were not available up to now....

ver descrição completa

Autor principal: Lehmann, Johannes
Outros Autores: Liang, Biqing, Solomon, Dawit, Lerotic, Mirna, Luizão, Flávio Jesus, Kinyangi, James M., Schäfer, Thorsten, Wirick, Sue, Jacobsen, Chris J.
Grau: Artigo
Idioma: English
Publicado em: Global Biogeochemical Cycles 2020
Assuntos:
Analytical Method
Organic Carbon
Soil Carbon
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/18854
id oai:repositorio:1-18854
recordtype dspace
spelling oai:repositorio:1-18854 Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles Lehmann, Johannes Liang, Biqing Solomon, Dawit Lerotic, Mirna Luizão, Flávio Jesus Kinyangi, James M. Schäfer, Thorsten Wirick, Sue Jacobsen, Chris J. Analytical Method Organic Carbon Soil Carbon Small-scale heterogeneity of organic carbon (C) forms in soils is poorly quantified since appropriate analytical techniques were not available up to now. Specifically, tools for the identification of functional groups on the surface of micrometer-sized black C particles were not available up to now. Scanning Transmission X-ray Microscopy (STXM) using synchrotron radiation was used in conjunction with Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy to investigate nano-scale distribution (50-nm resolution) of C forms in black C particles and compared to synchrotron-based FTIR spectroscopy. A new embedding technique was developed that did not build on a C-based embedding medium and did not pose the risk of heat damage to the sample. Elemental sulfur (S) was melted to 220°C until it polymerized and quenched with liquid N2 to obtain a very viscous plastic S in which the black C could be embedded until it hardened to a noncrystalline state and was ultrasectioned. Principal component and cluster analysis followed by singular value decomposition was able to resolve distinct areas in a black carbon particle. The core of the studied biomass-derived black C particles was highly aromatic even after thousands of years of exposure in soil and resembled the spectral characteristics of fresh charcoal. Surrounding this core and on the surface of the black C particle, however, much larger proportions of carboxylic and phenolic C forms were identified that were spatially and structurally distinct from the core of the particle. Cluster analysis provided evidence for both oxidation of the black C particle itself as well as adsorption of non-black C. NEXAFS spectroscopy has great potential to allow new insight into black C properties with important implications for biogeochemical cycles such as mineralization of black C in soils and sediments, and adsorption of C, nutrients, and pollutants as well as transport in the geosphere, hydrosphere, and atmosphere. Copyright 2005 by the American Geophysical Union. 2020-06-15T22:03:28Z 2020-06-15T22:03:28Z 2005 Artigo https://repositorio.inpa.gov.br/handle/1/18854 10.1029/2004GB002435 en Volume 19, Número 1, Pags. 1-12 Restrito Global Biogeochemical Cycles
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Analytical Method
Organic Carbon
Soil Carbon
spellingShingle Analytical Method
Organic Carbon
Soil Carbon
Lehmann, Johannes
Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
topic_facet Analytical Method
Organic Carbon
Soil Carbon
description Small-scale heterogeneity of organic carbon (C) forms in soils is poorly quantified since appropriate analytical techniques were not available up to now. Specifically, tools for the identification of functional groups on the surface of micrometer-sized black C particles were not available up to now. Scanning Transmission X-ray Microscopy (STXM) using synchrotron radiation was used in conjunction with Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy to investigate nano-scale distribution (50-nm resolution) of C forms in black C particles and compared to synchrotron-based FTIR spectroscopy. A new embedding technique was developed that did not build on a C-based embedding medium and did not pose the risk of heat damage to the sample. Elemental sulfur (S) was melted to 220°C until it polymerized and quenched with liquid N2 to obtain a very viscous plastic S in which the black C could be embedded until it hardened to a noncrystalline state and was ultrasectioned. Principal component and cluster analysis followed by singular value decomposition was able to resolve distinct areas in a black carbon particle. The core of the studied biomass-derived black C particles was highly aromatic even after thousands of years of exposure in soil and resembled the spectral characteristics of fresh charcoal. Surrounding this core and on the surface of the black C particle, however, much larger proportions of carboxylic and phenolic C forms were identified that were spatially and structurally distinct from the core of the particle. Cluster analysis provided evidence for both oxidation of the black C particle itself as well as adsorption of non-black C. NEXAFS spectroscopy has great potential to allow new insight into black C properties with important implications for biogeochemical cycles such as mineralization of black C in soils and sediments, and adsorption of C, nutrients, and pollutants as well as transport in the geosphere, hydrosphere, and atmosphere. Copyright 2005 by the American Geophysical Union.
format Artigo
author Lehmann, Johannes
author2 Liang, Biqing
Solomon, Dawit
Lerotic, Mirna
Luizão, Flávio Jesus
Kinyangi, James M.
Schäfer, Thorsten
Wirick, Sue
Jacobsen, Chris J.
author2Str Liang, Biqing
Solomon, Dawit
Lerotic, Mirna
Luizão, Flávio Jesus
Kinyangi, James M.
Schäfer, Thorsten
Wirick, Sue
Jacobsen, Chris J.
title Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
title_short Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
title_full Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
title_fullStr Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
title_full_unstemmed Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles
title_sort near-edge x-ray absorption fine structure (nexafs) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: application to black carbon particles
publisher Global Biogeochemical Cycles
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/18854
_version_ 1787141637534646272
score 11.755432

Registros relacionados