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https://hdl.handle.net/1822/7536
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Campo DC | Valor | Idioma |
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dc.contributor.author | Ribeiro, Daniel | - |
dc.contributor.author | Martins, Gilberto | - |
dc.contributor.author | Nogueira, R. | - |
dc.contributor.author | Cruz, J. Virgílio | - |
dc.contributor.author | Brito, A. G. | - |
dc.date.accessioned | 2008-01-16T22:08:19Z | - |
dc.date.available | 2008-01-16T22:08:19Z | - |
dc.date.issued | 2008-01 | - |
dc.identifier.citation | "Chemosphere". ISSN 0045-6535. 70:7 (Jan. 2008) 1256-1263. | eng |
dc.identifier.issn | 0045-6535 | eng |
dc.identifier.uri | https://hdl.handle.net/1822/7536 | - |
dc.description.abstract | 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. | eng |
dc.description.sponsorship | Fundação para a Ciência e a Tecnologia (FCT) | por |
dc.language.iso | eng | eng |
dc.publisher | Elsevier Ltd. | eng |
dc.rights | openAccess | eng |
dc.subject | Eutrophication | eng |
dc.subject | Phosphorus extraction | eng |
dc.subject | Sediment | eng |
dc.subject | Volcanic lakes | eng |
dc.title | Phosphorus fractionation in volcanic lake sediments (Azores – Portugal) | eng |
dc.type | article | por |
dc.peerreviewed | yes | eng |
sdum.number | 7 | eng |
sdum.pagination | 1256–1263 | eng |
sdum.publicationstatus | published | eng |
sdum.volume | 70 | eng |
oaire.citationStartPage | 1256 | por |
oaire.citationEndPage | 1263 | por |
oaire.citationIssue | 7 | por |
oaire.citationVolume | 70 | por |
dc.identifier.doi | 10.1016/j.chemosphere.2007.07.064 | por |
dc.identifier.pmid | 17868771 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Chemosphere | por |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Ribeiro_Chemosphere[2].pdf | 551,71 kB | Adobe PDF | Ver/Abrir |