Magnetic microparticles as a new tool for lake restoration: A microcosm experiment for evaluating the impact on phosphorus fluxes and sedimentary phosphorus pools
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AuthorÁlvarez-Manzaneda, Inmaculada; Vicente Álvarez De Manzaneda, María Inmaculada De; Vicente Álvarez-Manzaneda, Juan De; Funes, Ana Inmaculada; Cruz Pizarro, Luis José
Magnetic particlesLake restorationEutrophicationPhosphorus adsorptionWetlands
Water Research 89:366-374
SponsorshipThis work was supported by Junta de Andalucía projects P10- RNM-6630 and P11-FQM-7074 (Proyectos de Excelencia, Spain), and MINECO CTM 2013-46951-R and MAT 2013-44429-R and projects (Spain).
In the last decades, magnetic particles (MPs) as adsorbents have gained special attention due to their high adsorption capacity and the possibility of recovering them by applying a magnetic separation gradient. For the first time MPs have been tested as P adsorbents in a microcosm experiment in a context of lake restoration. MPs were added to sediment cores from a hypertrophic lake, at Fe:PMobile molar ratio of 285:1 and 560:1 under both, oxic and anoxic conditions. We have found that, under anoxic conditions (anoxic), MPs are able to reduce P release rate from the sediment to the overlying water and to reduce sedimentary PMobile concentration (a 22e25% reduction within 0e4 cm depth compared to controls). Under oxic conditions, the addition of MPs do not affect P fluxes across the sediment and water interface since the lake sediment is naturally rich in iron oxides. However a measured reduction in sedimentary PMobile concentration (12e16% reduction in 0e10 cm depth) contributes to a potential reduction in longterm P efflux.