Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Química Nova (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000600007 |
Resumo: | The radiocarbon dating of the soil organic matter (SOM) is a polemic subject, due mainly to the complexity of the formation of the soils and to the variable contamination from several sources. Soil samples from 4 different Brazilian localities were submitted to physical and chemical pre-treatment for the extraction of humin fraction, which is the most stable organic compound and theoretically the oldest and representative of the age of the SOM. The radiocarbon dating obtained from the total SOM and their humin fractions are compared to the 14C ages from buried charcoals at similar depths. The radiocarbon ages obtained from such charcoals are, in most of the cases, concordant within the experimental errors of those obtained on humin fractions, or are in average 10% higher, with one exception. Thus, the ages on humin fractions could be assumed as the minimum ages for the associated soils, while the results obtained on total SOM, even at depths until 200 cm, exhibit pronounced contamination effect by modern carbon, rejuvenating their ages. |
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Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseischarcoalhumin fractionradiocarbon datingThe radiocarbon dating of the soil organic matter (SOM) is a polemic subject, due mainly to the complexity of the formation of the soils and to the variable contamination from several sources. Soil samples from 4 different Brazilian localities were submitted to physical and chemical pre-treatment for the extraction of humin fraction, which is the most stable organic compound and theoretically the oldest and representative of the age of the SOM. The radiocarbon dating obtained from the total SOM and their humin fractions are compared to the 14C ages from buried charcoals at similar depths. The radiocarbon ages obtained from such charcoals are, in most of the cases, concordant within the experimental errors of those obtained on humin fractions, or are in average 10% higher, with one exception. Thus, the ages on humin fractions could be assumed as the minimum ages for the associated soils, while the results obtained on total SOM, even at depths until 200 cm, exhibit pronounced contamination effect by modern carbon, rejuvenating their ages.Sociedade Brasileira de Química1999-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000600007Química Nova v.22 n.6 1999reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40421999000600007info:eu-repo/semantics/openAccessGouveia,Susy Eli MarquesPessenda,Luiz Carlos RuizAravena,Ramonpor2000-10-06T00:00:00Zoai:scielo:S0100-40421999000600007Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2000-10-06T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
title |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
spellingShingle |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis Gouveia,Susy Eli Marques charcoal humin fraction radiocarbon dating |
title_short |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
title_full |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
title_fullStr |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
title_full_unstemmed |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
title_sort |
Datação da fração humina da matéria orgânica do solo e sua comparação com idades 14C de carvões fósseis |
author |
Gouveia,Susy Eli Marques |
author_facet |
Gouveia,Susy Eli Marques Pessenda,Luiz Carlos Ruiz Aravena,Ramon |
author_role |
author |
author2 |
Pessenda,Luiz Carlos Ruiz Aravena,Ramon |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Gouveia,Susy Eli Marques Pessenda,Luiz Carlos Ruiz Aravena,Ramon |
dc.subject.por.fl_str_mv |
charcoal humin fraction radiocarbon dating |
topic |
charcoal humin fraction radiocarbon dating |
description |
The radiocarbon dating of the soil organic matter (SOM) is a polemic subject, due mainly to the complexity of the formation of the soils and to the variable contamination from several sources. Soil samples from 4 different Brazilian localities were submitted to physical and chemical pre-treatment for the extraction of humin fraction, which is the most stable organic compound and theoretically the oldest and representative of the age of the SOM. The radiocarbon dating obtained from the total SOM and their humin fractions are compared to the 14C ages from buried charcoals at similar depths. The radiocarbon ages obtained from such charcoals are, in most of the cases, concordant within the experimental errors of those obtained on humin fractions, or are in average 10% higher, with one exception. Thus, the ages on humin fractions could be assumed as the minimum ages for the associated soils, while the results obtained on total SOM, even at depths until 200 cm, exhibit pronounced contamination effect by modern carbon, rejuvenating their ages. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-12-01 |
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=S0100-40421999000600007 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000600007 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.1590/S0100-40421999000600007 |
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.22 n.6 1999 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_ |
1750318101243625472 |