Accumulation and oxidation of elemental mercury in tropical soils.
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
dARK ID: | ark:/61566/001300000g313 |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/6264 https://doi.org/10.1016/j.chemosphere.2015.04.020 |
Resumo: | The role of chemical and mineralogical soil properties in the retention and oxidation of atmospheric mercury in tropical soils is discussed based on thermal desorption analysis. The retention of gaseous mercury by tropical soils varied greatly both quantitatively and qualitatively with soil type. The average natural mercury content of soils was 0.08 ± 0.06 lg g 1 with a maximum of 0.215 ± 0.009 lg g 1. After gaseous Hg0 incubation experiments, mercury content of investigated soils ranged from 0.6 ± 0.2 to 735 ± 23 lg g 1, with a mean value of 44 ± 146 lg g 1. Comparatively, A horizon of almost all soil types adsorbed more mercury than B horizon from the same soil, which demonstrates the key role of organic matter in mercury adsorption. In addition to organic matter, pH and CEC also appear to be important soil characteristics for the adsorption of mercury. All thermograms showed Hg2+ peaks, which were predominant in most of them, indicating that elemental mercury oxidized in tropical soils. After four months of incubation, the thermograms showed oxidation levels from 70% to 100%. As none of the samples presented only the Hg0 peak, and the soils retained varying amounts of mercury despite exposure under the same incubation conditions, it became clear that oxidation occurred on soil surface. Organic matter seemed to play a key role in mercury oxidation through complexation/stabilization of the oxidized forms. The lower percentages of available mercury (extracted with KNO3) in A horizons when compared to B horizons support this idea. |
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Accumulation and oxidation of elemental mercury in tropical soils.Atmospheric mercuryChemical transformationsAdsorptionThermal desorptionThe role of chemical and mineralogical soil properties in the retention and oxidation of atmospheric mercury in tropical soils is discussed based on thermal desorption analysis. The retention of gaseous mercury by tropical soils varied greatly both quantitatively and qualitatively with soil type. The average natural mercury content of soils was 0.08 ± 0.06 lg g 1 with a maximum of 0.215 ± 0.009 lg g 1. After gaseous Hg0 incubation experiments, mercury content of investigated soils ranged from 0.6 ± 0.2 to 735 ± 23 lg g 1, with a mean value of 44 ± 146 lg g 1. Comparatively, A horizon of almost all soil types adsorbed more mercury than B horizon from the same soil, which demonstrates the key role of organic matter in mercury adsorption. In addition to organic matter, pH and CEC also appear to be important soil characteristics for the adsorption of mercury. All thermograms showed Hg2+ peaks, which were predominant in most of them, indicating that elemental mercury oxidized in tropical soils. After four months of incubation, the thermograms showed oxidation levels from 70% to 100%. As none of the samples presented only the Hg0 peak, and the soils retained varying amounts of mercury despite exposure under the same incubation conditions, it became clear that oxidation occurred on soil surface. Organic matter seemed to play a key role in mercury oxidation through complexation/stabilization of the oxidized forms. The lower percentages of available mercury (extracted with KNO3) in A horizons when compared to B horizons support this idea.2016-01-28T14:37:09Z2016-01-28T14:37:09Z2015info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfSOARES, L. C. et al. Accumulation and oxidation of elemental mercury in tropical soils. Chemosphere, v. 134, p. 181-191, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0045653515003483>. Acesso em: 13 out 2015.0045-6535http://www.repositorio.ufop.br/handle/123456789/6264https://doi.org/10.1016/j.chemosphere.2015.04.020ark:/61566/001300000g313O periódico Chemosphere concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3730730956104.info:eu-repo/semantics/openAccessSoares, Liliane CatoneEgreja Filho, Fernando BarbozaLinhares, Lucília AlvesWindmoller, Cláudia CarvalhinhoYoshida, Maria Ireneengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2024-11-11T03:59:29Zoai:repositorio.ufop.br:123456789/6264Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332024-11-11T03:59:29Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.none.fl_str_mv |
Accumulation and oxidation of elemental mercury in tropical soils. |
title |
Accumulation and oxidation of elemental mercury in tropical soils. |
spellingShingle |
Accumulation and oxidation of elemental mercury in tropical soils. Soares, Liliane Catone Atmospheric mercury Chemical transformations Adsorption Thermal desorption |
title_short |
Accumulation and oxidation of elemental mercury in tropical soils. |
title_full |
Accumulation and oxidation of elemental mercury in tropical soils. |
title_fullStr |
Accumulation and oxidation of elemental mercury in tropical soils. |
title_full_unstemmed |
Accumulation and oxidation of elemental mercury in tropical soils. |
title_sort |
Accumulation and oxidation of elemental mercury in tropical soils. |
author |
Soares, Liliane Catone |
author_facet |
Soares, Liliane Catone Egreja Filho, Fernando Barboza Linhares, Lucília Alves Windmoller, Cláudia Carvalhinho Yoshida, Maria Irene |
author_role |
author |
author2 |
Egreja Filho, Fernando Barboza Linhares, Lucília Alves Windmoller, Cláudia Carvalhinho Yoshida, Maria Irene |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Soares, Liliane Catone Egreja Filho, Fernando Barboza Linhares, Lucília Alves Windmoller, Cláudia Carvalhinho Yoshida, Maria Irene |
dc.subject.por.fl_str_mv |
Atmospheric mercury Chemical transformations Adsorption Thermal desorption |
topic |
Atmospheric mercury Chemical transformations Adsorption Thermal desorption |
description |
The role of chemical and mineralogical soil properties in the retention and oxidation of atmospheric mercury in tropical soils is discussed based on thermal desorption analysis. The retention of gaseous mercury by tropical soils varied greatly both quantitatively and qualitatively with soil type. The average natural mercury content of soils was 0.08 ± 0.06 lg g 1 with a maximum of 0.215 ± 0.009 lg g 1. After gaseous Hg0 incubation experiments, mercury content of investigated soils ranged from 0.6 ± 0.2 to 735 ± 23 lg g 1, with a mean value of 44 ± 146 lg g 1. Comparatively, A horizon of almost all soil types adsorbed more mercury than B horizon from the same soil, which demonstrates the key role of organic matter in mercury adsorption. In addition to organic matter, pH and CEC also appear to be important soil characteristics for the adsorption of mercury. All thermograms showed Hg2+ peaks, which were predominant in most of them, indicating that elemental mercury oxidized in tropical soils. After four months of incubation, the thermograms showed oxidation levels from 70% to 100%. As none of the samples presented only the Hg0 peak, and the soils retained varying amounts of mercury despite exposure under the same incubation conditions, it became clear that oxidation occurred on soil surface. Organic matter seemed to play a key role in mercury oxidation through complexation/stabilization of the oxidized forms. The lower percentages of available mercury (extracted with KNO3) in A horizons when compared to B horizons support this idea. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015 2016-01-28T14:37:09Z 2016-01-28T14:37:09Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
SOARES, L. C. et al. Accumulation and oxidation of elemental mercury in tropical soils. Chemosphere, v. 134, p. 181-191, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0045653515003483>. Acesso em: 13 out 2015. 0045-6535 http://www.repositorio.ufop.br/handle/123456789/6264 https://doi.org/10.1016/j.chemosphere.2015.04.020 |
dc.identifier.dark.fl_str_mv |
ark:/61566/001300000g313 |
identifier_str_mv |
SOARES, L. C. et al. Accumulation and oxidation of elemental mercury in tropical soils. Chemosphere, v. 134, p. 181-191, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0045653515003483>. Acesso em: 13 out 2015. 0045-6535 ark:/61566/001300000g313 |
url |
http://www.repositorio.ufop.br/handle/123456789/6264 https://doi.org/10.1016/j.chemosphere.2015.04.020 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFOP instname:Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
instname_str |
Universidade Federal de Ouro Preto (UFOP) |
instacron_str |
UFOP |
institution |
UFOP |
reponame_str |
Repositório Institucional da UFOP |
collection |
Repositório Institucional da UFOP |
repository.name.fl_str_mv |
Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP) |
repository.mail.fl_str_mv |
repositorio@ufop.edu.br |
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1817705801648701440 |