title: Kinetics of the PO4-P adsorption onto soils and sediments from the Mondego estuary (Portugal).
abstract: In order to assess the status of a North Atlantic Ocean Ecoregion (Mondego system, Portugal) after the implementation of a management programme, a study on PO4-P sorption was carried out. Considering that sorption velocity markedly determines the systems promptness to phosphorus external loading, the kinetics of the sorption of PO4-P onto estuarine sediments and the upstream agricultural soils was studied. The pseudo-second order kinetic equation gave an appropriate description of PO4-P sorption onto these soils and sediments, allowing for a quantitative comparison. For soils, the kinetic constants (k2*, μg(-1) g h(-1)) ranged between 0.007 and 0.017 μg(-1) g h(-1) while, in the case of sediments these ranged between 0.008 and 0.012 μg(-1) g h(-1). Results showed that the reduction of water residence time after the management action was relevant for the system status, affecting its reaction capacity to phosphorus loading.
authors.affiliation: Department of Chemistry & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Department of Applied Chemistry and Physics, University of León, Campus de Vegazana, 24071 León, Spain. Electronic address: marta.otero@unileon.es.
authors.forename: M
authors.initials: M
authors.lastname: Otero
authors.forename: J P
authors.initials: JP
authors.lastname: Coelho
authors.forename: E T
authors.initials: ET
authors.lastname: Rodrigues
authors.forename: M A
authors.initials: MA
authors.lastname: Pardal
authors.forename: E B H
authors.initials: EB
authors.lastname: Santos
authors.forename: V I
authors.initials: VI
authors.lastname: Esteves
authors.forename: A I
authors.initials: AI
authors.lastname: Lillebø
mesh_terms: D000327:Adsorption; D004784:Environmental Monitoring; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D010710:Phosphates / Q000032:analysis* / Q000737:chemistry; D011174:Portugal; D012987:Soil / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D010710:Phosphates; D012987:Soil; D014874:Water Pollutants, Chemical
keywords: Estuarine management; Eutrophication; Kinetics; Modelling; Phosphorus; Sorption