Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.)
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10198/2002 |
Resumo: | The zinc uptake and posterior release by an aquatic bryophyte—Fontinalis antipyretica L. Ex Hedw.—was experimentally studied in laboratory exposing the plants to different zinc concentrations in the range, 1.0–5.0 mg l 1, for a 144 h contamination period, and then exposed to metal-free water for a 120 h decontamination period. The experiments were carried out in perfectly mixed contactors at controlled illumination, using mosses picked out in February 1997, with a background initial zinc concentration of 263mg g 1 (dry wt.). A first-order mass transfer kinetic model was fitted to the experimental data to determine the uptake and release constants, k1 and k2; the zinc concentration in mosses at the end of the uptake period, Cmu; and at the equilibrium, for the contamination and decontamination stages, Cme and Cmr; respectively. A bioconcentration factor, BCF ¼ k1=k2 (zinc concentration in the plant, dry wt./zinc concentration in the water) was determined. A biological elimination factor defined as BEF ¼ 1 Cmr=Cmu was also calculated. BCF decreases from about 4500 to 2950 as Zn concentration in water increases from 1.05 to 3.80mg l 1. BEF is approximately constant and equal to 0.80. Comparing Zn and Cu accumulation by Fontinalis antipyretica, it was concluded that the uptake rate for Zn (145 h 1) is much lower than for Cu (628 h 1) and the amount retained by the plant decreased by a factor of about seven. |
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Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.)Aquatic bryophytesMossesKineticsZincFontinalis antipyreticaThe zinc uptake and posterior release by an aquatic bryophyte—Fontinalis antipyretica L. Ex Hedw.—was experimentally studied in laboratory exposing the plants to different zinc concentrations in the range, 1.0–5.0 mg l 1, for a 144 h contamination period, and then exposed to metal-free water for a 120 h decontamination period. The experiments were carried out in perfectly mixed contactors at controlled illumination, using mosses picked out in February 1997, with a background initial zinc concentration of 263mg g 1 (dry wt.). A first-order mass transfer kinetic model was fitted to the experimental data to determine the uptake and release constants, k1 and k2; the zinc concentration in mosses at the end of the uptake period, Cmu; and at the equilibrium, for the contamination and decontamination stages, Cme and Cmr; respectively. A bioconcentration factor, BCF ¼ k1=k2 (zinc concentration in the plant, dry wt./zinc concentration in the water) was determined. A biological elimination factor defined as BEF ¼ 1 Cmr=Cmu was also calculated. BCF decreases from about 4500 to 2950 as Zn concentration in water increases from 1.05 to 3.80mg l 1. BEF is approximately constant and equal to 0.80. Comparing Zn and Cu accumulation by Fontinalis antipyretica, it was concluded that the uptake rate for Zn (145 h 1) is much lower than for Cu (628 h 1) and the amount retained by the plant decreased by a factor of about seven.ElsevierBiblioteca Digital do IPBMartins, RamiroBoaventura, Rui2010-02-18T16:31:15Z20022002-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10198/2002engMartins, Ramiro; Boaventura, Rui (2002). Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.). Water Research. ISSN 0043-1354. 36:20 p.5005-50120043-135410.1016/S0043-1354(02)00233-6info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-21T10:04:58Zoai:bibliotecadigital.ipb.pt:10198/2002Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:54:52.870062Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
title |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
spellingShingle |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) Martins, Ramiro Aquatic bryophytes Mosses Kinetics Zinc Fontinalis antipyretica |
title_short |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
title_full |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
title_fullStr |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
title_full_unstemmed |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
title_sort |
Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.) |
author |
Martins, Ramiro |
author_facet |
Martins, Ramiro Boaventura, Rui |
author_role |
author |
author2 |
Boaventura, Rui |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Biblioteca Digital do IPB |
dc.contributor.author.fl_str_mv |
Martins, Ramiro Boaventura, Rui |
dc.subject.por.fl_str_mv |
Aquatic bryophytes Mosses Kinetics Zinc Fontinalis antipyretica |
topic |
Aquatic bryophytes Mosses Kinetics Zinc Fontinalis antipyretica |
description |
The zinc uptake and posterior release by an aquatic bryophyte—Fontinalis antipyretica L. Ex Hedw.—was experimentally studied in laboratory exposing the plants to different zinc concentrations in the range, 1.0–5.0 mg l 1, for a 144 h contamination period, and then exposed to metal-free water for a 120 h decontamination period. The experiments were carried out in perfectly mixed contactors at controlled illumination, using mosses picked out in February 1997, with a background initial zinc concentration of 263mg g 1 (dry wt.). A first-order mass transfer kinetic model was fitted to the experimental data to determine the uptake and release constants, k1 and k2; the zinc concentration in mosses at the end of the uptake period, Cmu; and at the equilibrium, for the contamination and decontamination stages, Cme and Cmr; respectively. A bioconcentration factor, BCF ¼ k1=k2 (zinc concentration in the plant, dry wt./zinc concentration in the water) was determined. A biological elimination factor defined as BEF ¼ 1 Cmr=Cmu was also calculated. BCF decreases from about 4500 to 2950 as Zn concentration in water increases from 1.05 to 3.80mg l 1. BEF is approximately constant and equal to 0.80. Comparing Zn and Cu accumulation by Fontinalis antipyretica, it was concluded that the uptake rate for Zn (145 h 1) is much lower than for Cu (628 h 1) and the amount retained by the plant decreased by a factor of about seven. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002 2002-01-01T00:00:00Z 2010-02-18T16:31:15Z |
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 |
http://hdl.handle.net/10198/2002 |
url |
http://hdl.handle.net/10198/2002 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Martins, Ramiro; Boaventura, Rui (2002). Uptake and release of zinc by aquatic bryophytes (Fontinalis antipyretica L. ex. Hedw.). Water Research. ISSN 0043-1354. 36:20 p.5005-5012 0043-1354 10.1016/S0043-1354(02)00233-6 |
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 |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1817553655203627008 |