Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)

Detalhes bibliográficos
Autor(a) principal: Ribeiro, Daniel
Data de Publicação: 2008
Outros Autores: Martins, Gilberto, Nogueira, R., Cruz, J. Virgílio, Brito, A. G.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/1822/7536
Resumo: The phosphorus distribution in volcanic sediments of three lakes that are under different anthropogenic pressures in São Miguel island (Azores – Portugal) was evaluated using a sequential extraction scheme. The P-fractionation scheme employs sequential extractions of sediment with NH4Cl, bicarbonate-dithionite (BD), NaOH (at room temperature), HCl and NaOH (at 85 °C) to obtain five P-fractions. The P-fractionation shows that in lakes with higher trophic status (Lake Furnas and Lake Sete Cidades), the NaOH extracted P is the dominant fraction, that contribute with more than 50% to total sedimentary phosphorus. The rank order of P-fractionation for these two lakes was NaOH > NaOH (85 °C) > HCl > BD > NH4Cl for Furnas lake and NaOH > HCl > NaOH (85 °C) > NH4Cl > BD for Sete Cidades lake. On the other hand, the trend of P contribution in the oligotrophic lake Fogo shows that the most inert P pools have the higher concentrations, with more than 50% of the P contribution from the last extraction step with NaOH at 85 °C. For this lake, the rank order of P-fractionation was NH4Cl > BD > NaOH > HCl > NaOH (85 °C). The Phosphorus Maximum Solubilization Potential (P-MSP) was also calculated and the results show that for the more bio-available P-fractions (first and second extraction step), the P-MSP values for Furnas and Sete Cidades lakes are sensibly higher than the results obtained in Fogo lake, an indication of the non-point diffuse load discharged in the first ones.
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spelling Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)EutrophicationPhosphorus extractionSedimentVolcanic lakesScience & TechnologyThe phosphorus distribution in volcanic sediments of three lakes that are under different anthropogenic pressures in São Miguel island (Azores – Portugal) was evaluated using a sequential extraction scheme. The P-fractionation scheme employs sequential extractions of sediment with NH4Cl, bicarbonate-dithionite (BD), NaOH (at room temperature), HCl and NaOH (at 85 °C) to obtain five P-fractions. The P-fractionation shows that in lakes with higher trophic status (Lake Furnas and Lake Sete Cidades), the NaOH extracted P is the dominant fraction, that contribute with more than 50% to total sedimentary phosphorus. The rank order of P-fractionation for these two lakes was NaOH > NaOH (85 °C) > HCl > BD > NH4Cl for Furnas lake and NaOH > HCl > NaOH (85 °C) > NH4Cl > BD for Sete Cidades lake. On the other hand, the trend of P contribution in the oligotrophic lake Fogo shows that the most inert P pools have the higher concentrations, with more than 50% of the P contribution from the last extraction step with NaOH at 85 °C. For this lake, the rank order of P-fractionation was NH4Cl > BD > NaOH > HCl > NaOH (85 °C). The Phosphorus Maximum Solubilization Potential (P-MSP) was also calculated and the results show that for the more bio-available P-fractions (first and second extraction step), the P-MSP values for Furnas and Sete Cidades lakes are sensibly higher than the results obtained in Fogo lake, an indication of the non-point diffuse load discharged in the first ones.Fundação para a Ciência e a Tecnologia (FCT)Elsevier Ltd.Universidade do MinhoRibeiro, DanielMartins, GilbertoNogueira, R.Cruz, J. VirgílioBrito, A. G.2008-012008-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/7536eng"Chemosphere". ISSN 0045-6535. 70:7 (Jan. 2008) 1256-1263.0045-653510.1016/j.chemosphere.2007.07.06417868771info: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:RCAAP2024-05-25T02:12:12Zoai:repositorium.sdum.uminho.pt:1822/7536Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-25T02:12:12Repositório 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 Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
title Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
spellingShingle Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
Ribeiro, Daniel
Eutrophication
Phosphorus extraction
Sediment
Volcanic lakes
Science & Technology
title_short Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
title_full Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
title_fullStr Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
title_full_unstemmed Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
title_sort Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)
author Ribeiro, Daniel
author_facet Ribeiro, Daniel
Martins, Gilberto
Nogueira, R.
Cruz, J. Virgílio
Brito, A. G.
author_role author
author2 Martins, Gilberto
Nogueira, R.
Cruz, J. Virgílio
Brito, A. G.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Ribeiro, Daniel
Martins, Gilberto
Nogueira, R.
Cruz, J. Virgílio
Brito, A. G.
dc.subject.por.fl_str_mv Eutrophication
Phosphorus extraction
Sediment
Volcanic lakes
Science & Technology
topic Eutrophication
Phosphorus extraction
Sediment
Volcanic lakes
Science & Technology
description The phosphorus distribution in volcanic sediments of three lakes that are under different anthropogenic pressures in São Miguel island (Azores – Portugal) was evaluated using a sequential extraction scheme. The P-fractionation scheme employs sequential extractions of sediment with NH4Cl, bicarbonate-dithionite (BD), NaOH (at room temperature), HCl and NaOH (at 85 °C) to obtain five P-fractions. The P-fractionation shows that in lakes with higher trophic status (Lake Furnas and Lake Sete Cidades), the NaOH extracted P is the dominant fraction, that contribute with more than 50% to total sedimentary phosphorus. The rank order of P-fractionation for these two lakes was NaOH > NaOH (85 °C) > HCl > BD > NH4Cl for Furnas lake and NaOH > HCl > NaOH (85 °C) > NH4Cl > BD for Sete Cidades lake. On the other hand, the trend of P contribution in the oligotrophic lake Fogo shows that the most inert P pools have the higher concentrations, with more than 50% of the P contribution from the last extraction step with NaOH at 85 °C. For this lake, the rank order of P-fractionation was NH4Cl > BD > NaOH > HCl > NaOH (85 °C). The Phosphorus Maximum Solubilization Potential (P-MSP) was also calculated and the results show that for the more bio-available P-fractions (first and second extraction step), the P-MSP values for Furnas and Sete Cidades lakes are sensibly higher than the results obtained in Fogo lake, an indication of the non-point diffuse load discharged in the first ones.
publishDate 2008
dc.date.none.fl_str_mv 2008-01
2008-01-01T00:00:00Z
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 https://hdl.handle.net/1822/7536
url https://hdl.handle.net/1822/7536
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Chemosphere". ISSN 0045-6535. 70:7 (Jan. 2008) 1256-1263.
0045-6535
10.1016/j.chemosphere.2007.07.064
17868771
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 Ltd.
publisher.none.fl_str_mv Elsevier Ltd.
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
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str 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
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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