Abstract

SANCHEZ, Nereida; SUBERO, Neudis  and  RIVERO, Carmen. Determination of the adsorption of cadmium by adsorption isotherms in agricultural soils venezuelans. Acta Agron. [online]. 2011, vol.60, n.2, pp.190-197. ISSN 0120-2812.

Cadmium is a heavy metal which tends to accumulate in the soil surface. In recent years, anthropogenic activities have caused an increase of the levels of this metal in agricultural soils causing great environmental concern due to their mobility and leaching in the soil profile and the ease way to be absorbed by plants. The purpose of this study was to determine the adsorption capacity of cadmium in four Venezuelan agricultural soils with different texture. To determine the adsorption capacity of Cd in each soil, first of all the optimal time of stirring was determined, which was two hours and the soilenriching solution of Cd, which was (1/50). With these parameters, cadmium adsorption isotherms for all soils were developed and compared with Freundlich and Langmuir models. The data showed that the Freundlich mathematical model is one of that best describes the kinetics reaction and adsorption capacity of cadmium in soils. Soils with the highest clay content, organic matter and acid pH conditions were those that showed higher adsorbing cadmium capacity.

Keywords : Adsorption isotherms; cadmium; soil.

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