Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6359351 | Marine Pollution Bulletin | 2013 | 6 Pages |
â¢The response of an estuarine system to a management action must be assessed.â¢With this aim, PO4-P sorption onto upstream soils and estuarine sediments was studied.â¢The management action led to a reduction of water residence time in the estuary.â¢Consequently, sediments and soils cannot fulfil their PO4-P maximum sorption capacity.
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 (k2â, μgâ1 g hâ1) ranged between 0.007 and 0.017 μgâ1 g hâ1 while, in the case of sediments these ranged between 0.008 and 0.012 μgâ1 g hâ1. 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.