Adsorcion de metales pesados en Andisoles, Vertisoles y acidos humicos

This research studied the adsorption of ve heavy metals (Cd, Cu, Ni, Pb and Zn) in three adsorbents, two Colombian agricultural soils (Typic Melanudand and ne clay 1% isohyperthermic-Ustic Epiaquert) and humic acids (HA) extracted from leonardite, of Spain. In both, HA and soils, the chemical properties determined were: pH, cation exchange capacity (CEC), organic carbon (% OC), exchangeable bases and total content of metals. The chemical composition of HA was determined using spectrometric techniques as ICP_MS, FTIR, UV-Vis, and CPMAS 13C NMR and Py-GC/MS-THMA. The results from the adsorption of metals in the three adsorbents were adjusted to Freundlich model, and these show a different behavior of the absorbers relative to the metals studied, in the same way the maximum adsorption capacity (K) and the retention force (n) of metals is signicantly different (p Pb> Cu> Ni> Zn, Andisol: Pb> Cu> Cd> Zn> Ni, and Vertisol: Cd> Pb> Cu> Ni> Zn. For n, Humic Acids: Pb> Zn> Cd> Cu> Ni, Andisol: Cu> Ni> Zn> Pb> Cd, and Vertisol: Zn> Ni> Cu> Pb> Cd.