Kinetics of the PO4-P adsorption onto soils and sediments from the Mondego estuary (Portugal)
2013
Otero, M. | Coelho, J. P. | Rodrigues, E. T. | Pardal, M. A. | Santos, E. B. H. | Esteves, V. I. | Lillebø, A. I.
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-1gh-1) ranged between 0.007 and 0.017μg-1gh-1while, in the case of sediments these ranged between 0.008 and 0.012μg-1gh-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.
Show more [+] Less [-]The authors want to acknowledge financial support from FCT (Fundação para a Ciência e a Tecnologia) to CESAM (Centre for Environmental and Marine Studies) and to IMAR (Institute of Marine Research). The Post-Doc grant SFRH/BPD/48449/2008 (P. Coelho) funded by FCT is also acknowledged. Also, Marta Otero acknowledges support from the Spanish Ministry of Science and Innovation (RYC-2010-05634). Special thanks are given go to Dr José Raposo for drawing Fig. 1.
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