Utilização de modelos físico-químicos de adsorção no estudo do comportamento do cobre em solos argilosos

• Main Authors: Sodré Fernando Fabriz, Lenzi Ervim, Costa Antonio Carlos Saraiva da
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2001-01-01
• Series: Química Nova
• Subjects: adsorption isotherms; heavy metal; tropical soils
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422001000300008

It was evaluated the applicability of Langmuir, Freundlich and Temkin models to copper adsorption in three classes of soils. Fractions of each soil were added to test tubes containing growing concentrations of the metal in solution. The tubes were shaken and the copper concentrations were determined in the extracts by atomic absorption spectrometry (AAS). The models offered a good fit for the experimental data indicating that presence of silicated clay had high influence on copper sorption. The Langmuir isotherm showed high influence of the organic matter in the absorption phenomenon. It was evidenced the importance of further studies related to Temkin model.