Person: García Moreno, Ana María
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First Name
Ana María
Last Name
García Moreno
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Biológicas
Department
Biodiversidad, Ecología y Evolución
Area
Zoología
Identifiers
2 results
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Item Factors influencing lead sorption–desorption at variable added metal concentrations in Rhodoxeralfs(Chemosphere, 2006) García Moreno, Ana María; González Parra, Juana; Quintana Nieto, José Ramón; Pérez Carreras, María LourdesThe response of ten soils of the lithic Rhodoxeralf type to the supply of lead at concentrations of 500, 1000, 2000, 3000, 4000, 5000 and 6000 mg kg−1 was examined in batch sorption–desorption tests. Lead availability in the soils was found to depend on its partitioning between the soil solution and the solid phase as reflected in adsorption isotherms. The isotherms, of the H type, were consistent with a high affinity of the sorbent for the metal, with which it forms stable inner-sphere complexes on the soil surface. Sorption–desorption tests revealed that some properties of the soils such as their pH (mean = 8) and high contents in clays (particularly in kaolinite) and crystalline iron oxides significantly influence Pb sorption, the effect being especially marked at high added metal concentrations. Added lead is largely retained by crystalline iron oxides and the soil clay fraction; the pH of the soil favours the release of variably-charged sites from both. The extent of Pb desorption was small, particularly at the lowest added levels (500 and 1000 mg kg−1). Desorption increased with increasing added Pb concentration and exceeded 50% at 5000 and 6000 mg kg−1; this suggests that Pb is present not only as inner-sphere complexes, but also as outer-sphere complexes and, partly, as precipitates. The desorption isotherms consist of three segments that exhibit significant differences depending on the added Pb concentration, namely: 500–1000, 2000–4000 and 5000–6000 mg kg−1.Item Zoología. Interpretación de modelos arquitectónicos(2007) García Moreno, Ana María; Outerelo Domínguez, Raimundo; Benito Salido, Jesús; Buencuerpo Arcas, Valentín Jesús; Fernández Blanco, Isabel; Marquina Díaz, Domingo; Parejo Piñón, María Cristina; Pérez Zaballos, Juan Mateo; Ruiz Piña, Eduardo; Hernández de Miguel, José María; Borges, Sonia; Gil Cid, María DoloresDescripción de los modelos arquitectónicos de los principales grupos animales.