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(38-19) Adsorption of Phenantrene on Clay Minerals. García Frutos, F. Javier1, Escolano, Olga*,1, Rodriguez, Vergelina1, Perez, Rosa1, Contreras, M.Luisa2, Díaz, F. Javier1, 1 CIEMAT. Avda. Complutense, 22, Madrid, Spain2 Universidad Autónoma de Madrid. Cantoblanco, Cantoblanco (Madrid), Spain ABSTRACT- The fate and behaviour of non-ionic hydrophobic organic compounds in deep soil is mainly controlled by the mineral fraction present in the soil due to the very low organic carbon content of the deep soil. The mineral fraction that may greatly influence the fate and transport of these compounds due to its presence and properties are the clay minerals. Clay minerals also become increasingly important in low organic content soils. Therefore, studies of non-ionic hydrophobic organic compounds adsorption on clay minerals without organic matter are necessary to better understand the fate and transport of these compounds. In this paper we used phenantrene as model compound of hydrophobic organic compound and five pure clay minerals: kaolinite, illite, montmorillonite, muscovite mica and vermiculite. These clays are selected due to its abundance in representative Spanish soils and different properties as its structural layers and expanding capacity. Batch experiments were performed using phenantrene aqueous solutions and the clays selected. Phenantrene sorption isotherms and retention capacities of the clays were obtained. The pH and ionic strength influence on the retention capacity of clays were also studied. Possible sorption mechanisms were inferred from the shape of the isotherms. Key words: phenantrene, sorption, clay minerals, retention capacity |
