Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions

Detalhes bibliográficos
Autor(a) principal: Saab,Sérgio da Costa
Data de Publicação: 2003
Outros Autores: Martin-Neto,Ladislau
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422003000400010
Resumo: In this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.
id SBQ-3_a3a15398afbaa3a66b811b0448aff97d
oai_identifier_str oai:scielo:S0100-40422003000400010
network_acronym_str SBQ-3
network_name_str Química Nova (Online)
repository_id_str
spelling Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractionssemiquinone free radicalstabilizationorganic matter soilIn this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.Sociedade Brasileira de Química2003-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422003000400010Química Nova v.26 n.4 2003reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422003000400010info:eu-repo/semantics/openAccessSaab,Sérgio da CostaMartin-Neto,Ladislaueng2003-08-04T00:00:00Zoai:scielo:S0100-40422003000400010Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2003-08-04T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
title Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
spellingShingle Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
Saab,Sérgio da Costa
semiquinone free radical
stabilization
organic matter soil
title_short Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
title_full Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
title_fullStr Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
title_full_unstemmed Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
title_sort Use of the EPR technique to determine thermal stability of some humified organic substances found in soil organic-mineral fractions
author Saab,Sérgio da Costa
author_facet Saab,Sérgio da Costa
Martin-Neto,Ladislau
author_role author
author2 Martin-Neto,Ladislau
author2_role author
dc.contributor.author.fl_str_mv Saab,Sérgio da Costa
Martin-Neto,Ladislau
dc.subject.por.fl_str_mv semiquinone free radical
stabilization
organic matter soil
topic semiquinone free radical
stabilization
organic matter soil
description In this work, using the EPR spectroscopy, we analysed the thermal stability of some organic-mineral compounds found in a Gleysoil from Rio Janeiro. It was observed a complete disappearance of the EPR signal around 600 °C for the < 2 µm fraction and a residual EPR signal of semiquinone free radical for the 2-20 µm and 20-53 µm fractions at the same temperature. Also, the experiments showed that the 2-20 µm fraction had a larger concentration of semiquinone free radical per g of carbon and a smaller line width indicated a larger humification of this fraction. This is an evidence that the soil organic matter of this fraction (2-20 µm) is more stable than the other ones.
publishDate 2003
dc.date.none.fl_str_mv 2003-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422003000400010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422003000400010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-40422003000400010
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.26 n.4 2003
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
_version_ 1750318103404740608

Registros relacionados