Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327

Detalhes bibliográficos
Autor(a) principal: Santino, Marcela Bianchessi da Cunha
Data de Publicação: 2008
Outros Autores: Junior, Irineu Bianchini
Tipo de documento: Artigo
Idioma: por
Título da fonte: Acta Scientiarum Biological Sciences
Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1327
Resumo: Assays were carried out to describe the kinetic aspects of biological bleaching of humic substances during its mineralization. Samples of aquatic plant and water (Oxycaryum cubense) were collected in the Infernão lagoon (21º 35' S and 47º 05' W; São Paulo State, Brazil). Experiments were carried out using fulvic acid (FA) and humic acid (HA) derived from leachates of O. cubense decay (120 days). FA and HA were added to 450 mL of lagoon water and incubated under high and low dissolved oxygen concentrations and at three temperatures. The optical density was monitored (95 days) and the data were fitted to first-order kinetic model. The processes involved with bleaching were favored with increasing temperature only during HA mineralization at low dissolved oxygen availability, indicating that in the Infernão lagoon, the biological bleaching of HA is more effective between November and April. Overall, FA presented higher bleaching coefficients than HA. Low HA bleaching coefficients are probably due to the complexity of the chemical structures and its transformation in FA
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spelling Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327Aspectos cinéticos da descoloração de substâncias húmicas durante a mineralização biológica - DOI: 10.4025/actascibiolsci.v27i2.1327Oxycaryum cubenseácido húmicoácido fúlvicocoeficientes de descoloraçãoaspectos cinéticos2.05.00.00-9 EcologiaAssays were carried out to describe the kinetic aspects of biological bleaching of humic substances during its mineralization. Samples of aquatic plant and water (Oxycaryum cubense) were collected in the Infernão lagoon (21º 35' S and 47º 05' W; São Paulo State, Brazil). Experiments were carried out using fulvic acid (FA) and humic acid (HA) derived from leachates of O. cubense decay (120 days). FA and HA were added to 450 mL of lagoon water and incubated under high and low dissolved oxygen concentrations and at three temperatures. The optical density was monitored (95 days) and the data were fitted to first-order kinetic model. The processes involved with bleaching were favored with increasing temperature only during HA mineralization at low dissolved oxygen availability, indicating that in the Infernão lagoon, the biological bleaching of HA is more effective between November and April. Overall, FA presented higher bleaching coefficients than HA. Low HA bleaching coefficients are probably due to the complexity of the chemical structures and its transformation in FAEnsaios foram realizados para descrever aspectos cinéticos da descoloração de substâncias húmicas (SH) durante sua mineralização biológica. Amostras de água e de planta aquática (Oxycaryum cubense) foram coletadas na lagoa do Infernão (21º 35’S e 47º 05’W; estado de São Paulo, Brasil). Os experimentos foram realizados usando ácidos fúlvico (AF) e húmico (AH) obtidos da degradação (120 dias) dos lixiviados de O. cubense. Os AF e AH foram adicionados a 450 mL de água da lagoa e incubados sob condições de altas e baixas concentrações de oxigênio dissolvido e em três temperaturas. A densidade óptica foi monitorada (95 dias) e os dados foram ajustados a um modelo cinético de primeira ordem. Os processos envolvidos com a descoloração das SH foram favorecidos com o aumento da temperatura, somente na mineralização dos AH sob condições de baixa disponibilidade de oxigênio dissolvido; indicando que na lagoa do Infernão, a descoloração biológica dos AH seja favorecida de novembro a abril. De maneira geral, os AF apresentaram coeficientes de descoloração mais altos que os HA. Os coeficientes baixos de descoloração dos AH provavelmente relacionaram-se com a complexidade das estruturas químicas e com sua transformação em AFUniversidade Estadual De Maringá2008-03-26info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/132710.4025/actascibiolsci.v27i2.1327Acta Scientiarum. Biological Sciences; Vol 27 No 2 (2005); 169-176Acta Scientiarum. Biological Sciences; v. 27 n. 2 (2005); 169-1761807-863X1679-9283reponame:Acta Scientiarum Biological Sciencesinstname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1327/765Santino, Marcela Bianchessi da CunhaJunior, Irineu Bianchiniinfo:eu-repo/semantics/openAccess2022-11-23T17:33:07Zoai:periodicos.uem.br/ojs:article/1327Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSciPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/oai||actabiol@uem.br1807-863X1679-9283opendoar:2022-11-23T17:33:07Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM)false
dc.title.none.fl_str_mv Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
Aspectos cinéticos da descoloração de substâncias húmicas durante a mineralização biológica - DOI: 10.4025/actascibiolsci.v27i2.1327
title Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
spellingShingle Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
Santino, Marcela Bianchessi da Cunha
Oxycaryum cubense
ácido húmico
ácido fúlvico
coeficientes de descoloração
aspectos cinéticos
2.05.00.00-9 Ecologia
title_short Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
title_full Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
title_fullStr Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
title_full_unstemmed Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
title_sort Kinetic aspects of humic substances bleaching during biological mineralization - DOI: 10.4025/actascibiolsci.v27i2.1327
author Santino, Marcela Bianchessi da Cunha
author_facet Santino, Marcela Bianchessi da Cunha
Junior, Irineu Bianchini
author_role author
author2 Junior, Irineu Bianchini
author2_role author
dc.contributor.author.fl_str_mv Santino, Marcela Bianchessi da Cunha
Junior, Irineu Bianchini
dc.subject.por.fl_str_mv Oxycaryum cubense
ácido húmico
ácido fúlvico
coeficientes de descoloração
aspectos cinéticos
2.05.00.00-9 Ecologia
topic Oxycaryum cubense
ácido húmico
ácido fúlvico
coeficientes de descoloração
aspectos cinéticos
2.05.00.00-9 Ecologia
description Assays were carried out to describe the kinetic aspects of biological bleaching of humic substances during its mineralization. Samples of aquatic plant and water (Oxycaryum cubense) were collected in the Infernão lagoon (21º 35' S and 47º 05' W; São Paulo State, Brazil). Experiments were carried out using fulvic acid (FA) and humic acid (HA) derived from leachates of O. cubense decay (120 days). FA and HA were added to 450 mL of lagoon water and incubated under high and low dissolved oxygen concentrations and at three temperatures. The optical density was monitored (95 days) and the data were fitted to first-order kinetic model. The processes involved with bleaching were favored with increasing temperature only during HA mineralization at low dissolved oxygen availability, indicating that in the Infernão lagoon, the biological bleaching of HA is more effective between November and April. Overall, FA presented higher bleaching coefficients than HA. Low HA bleaching coefficients are probably due to the complexity of the chemical structures and its transformation in FA
publishDate 2008
dc.date.none.fl_str_mv 2008-03-26
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1327
10.4025/actascibiolsci.v27i2.1327
url http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1327
identifier_str_mv 10.4025/actascibiolsci.v27i2.1327
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1327/765
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.publisher.none.fl_str_mv Universidade Estadual De Maringá
publisher.none.fl_str_mv Universidade Estadual De Maringá
dc.source.none.fl_str_mv Acta Scientiarum. Biological Sciences; Vol 27 No 2 (2005); 169-176
Acta Scientiarum. Biological Sciences; v. 27 n. 2 (2005); 169-176
1807-863X
1679-9283
reponame:Acta Scientiarum Biological Sciences
instname:Universidade Estadual de Maringá (UEM)
instacron:UEM
instname_str Universidade Estadual de Maringá (UEM)
instacron_str UEM
institution UEM
reponame_str Acta Scientiarum Biological Sciences
collection Acta Scientiarum Biological Sciences
repository.name.fl_str_mv Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM)
repository.mail.fl_str_mv ||actabiol@uem.br
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