Kinetics of the PO4-P adsorption onto soils and sediments from the Mondego estuary (Portugal)

• Autor(a) principal: Otero, M.
• Data de Publicação: 2013
• Outros Autores: Coelho, J. P., Rodrigues, E. T., Pardal, M. A., Santos, E. B. H., Esteves, V. I., Lillebo, A. I.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/25574; https://doi.org/10.1016/j.marpolbul.2013.08.039
• topic: Eutrophication; Estuarine management; Phosphorus; Sorption; Kinetics; Modelling

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 (k 2, lg 1 g h 1) ranged between 0.007 and 0.017 lg 1 g h 1 while, in the case of sediments these ranged between 0.008 and 0.012 lg 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.