%0 Journal Article
%T Applying Freundlich, Langmuir and Temkin models in Cu and Pb soil sorption experiments Uso de los modelos de Freundlich, Langmuir y Temkin en experimentos de sorci車n de Cu y Pb en suelos Aplica  o dos modelos de Freundlich, Langmuir e Temkin em ensaios de sor  o de Cu e Pb no solo
%A F.A. Vega
%A E. F. Covelo
%A M. L. Andrade
%J Spanish Journal of Soil Science
%D 2011
%I Universia
%R 10.3232/sjss.2011.v1.n1.02
%X In acid soils, inputs of Cu and Pb of various origins create a high risk of environmental pollution. For this reason, batch experiments on Cu and Pb sorption and desorption in various horizons of three acid soils were performed on soil pH with 0.01 M NaNO3 as background electrolyte. The objectives were to evaluate Cu and Pb sorption and retention capacity through the Langmuir, Freundlich and Temkin equations parameters fitted to the sorption/desorption data; to determine the coherence of the implications of these parameters; and to estimate the role of various soil characteristics in the Cu and Pb immobilization soil capacity. The results confirmed the suitability of the models parameters for studying Cu and Pb sorption and retention by acid soils. The greatest maximum sorption and retention capacities, indicated by the Langmuir parameter  L, corresponded to the lowest energy values required for fixation, indicated by the Temkin parameter b . Together with the Freundlich parameter KF, which indicates sorption and retention capacity, they made it possible to infer that the acid soil component that most influences Cu and Pb immobilization was the organic matter, followed by the Al-oxide content. High organic matter and Al-oxide contents, especially the former, gave rise to a lower energy requirement for the immobilization of metal cations, since they increased the soils  sorption and retention capacities. Al3+, the dominant cation in the exchange complex in the horizons studied, and K+ are responsible for the influence of CECe on Cu and Pb immobilization in the acid soils studied. El aporte de Cu y Pb a trav谷s de diversas fuentes a suelos 芍cidos supone un alto riesgo de contaminaci車n medioambiental. Por ello, usando el m谷todo batch y con NaNO3 0,01 M como electrolito de fondo, se llevaron a cabo, al pH del suelo, experimentos de sorci車n y desorci車n de ambos elementos en muestras de todos los horizontes de tres suelos 芍cidos. Los objetivos fueron evaluar la capacidad de sorci車n y retenci車n de Cu y Pb a trav谷s de los par芍metros derivados de los ajustes a los modelos de Langmuir, Freundlich y Temkin; determinar la coherencia de las conclusiones deducidas de dichos par芍metros, y estimar el papel de las caracter赤sticas de todos los horizontes de esos suelos 芍cidos en la capacidad de fijaci車n de Cu y Pb. Los resultados confirmaron la idoneidad del uso de los par芍metros de las ecuaciones de Langmuir, Freundlich y Temkin para estudiar la sorci車n y retenci車n de Cu y Pb por los suelos 芍cidos, ya que permitieron deducir que los mayores valores de la m芍xima capacidad
%K Acid soils
%K sorption and desorption capacity
%K soil characteristics
%K Suelos 芍cidos
%K capacidad de sorci車n y desorci車n
%K caracter赤sticas de los suelos
%K Solos 芍cidos
%K capacidade de sor  o e desor  o
%K caracter赤sticas dos solos
%U http://sjss.universia.net/pdfs_revistas/articulo_233_1319128178546.pdf