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Tidal flushing of ammonium, iron and manganese from inter-tidal sediment pore waters

1997Journal article Restricted access
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dc.contributor.authorCaetano, M.
dc.contributor.authorFalcão, M.
dc.contributor.authorVale, C.
dc.contributor.authorBebianno, Maria João
dc.date.accessioned2020-05-26T20:15:35Z
dc.date.available2020-05-26T20:15:35Z
dc.date.issued1997
dc.description.abstractConcentrations of ammonium, manganese and iron were examined in sediment pore water and near-bottom water of inter-tidal sediments of Ria Formosa, a coastal lagoon in the South of Portugal, during the short period of time that water flooded the area. Short-sediment cores and overlying water retained during the ebb tide were sampled at air-exposed area. Immediately after the inundation sediment cores and flooding water were repeatedly collected over short periods of time: 20 min for ammonium and 60 min for iron and manganese. The pore water composition of the upper 2-cm sediment changed dramatically in NH4+, Mn and Fe during the first minutes of the flood. This decrease was recorded together with an increase of ammonium and manganese in the flooding water. The inundation causes a mixing of freshly tidal water in the interstices of sediment surface, pore water being mixed with sea water and oxygen supplied to anoxic layers of the sediment. Consequently NH: in pore water and weakly bound to sediment is exported to the water column, Mn(II) also escapes from the sediment, but Fe(II) is oxidised rapidly and iron is recycled inside the sediment. These processes occur on a semi-diurnal time scale that implies a continuously re-adjustment of the chemical of inter-tidal sediment surface of Ria Formosa.pt_PT
dc.description.sponsorshipCIENCIA/BD/2.596/93-IGpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/S0304-4203(97)00035-2pt_PT
dc.identifier.issn0304-4203
dc.identifier.urihttp://hdl.handle.net/10400.1/13950
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectTidal flushingpt_PT
dc.subjectPore waterspt_PT
dc.subjectAmmoniumpt_PT
dc.subjectIronpt_PT
dc.subjectManganesept_PT
dc.titleTidal flushing of ammonium, iron and manganese from inter-tidal sediment pore waterspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage211pt_PT
oaire.citation.issue1-2pt_PT
oaire.citation.startPage203pt_PT
oaire.citation.titleMarine Chemistrypt_PT
oaire.citation.volume58pt_PT
person.familyNameBebianno
person.givenNameMaria
person.identifier.ciencia-id2B11-46AC-B94B
person.identifier.orcid0000-0003-1492-8566
person.identifier.scopus-author-id7004152715
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32
relation.isAuthorOfPublication.latestForDiscovery2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32

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