Selenium Adsorption as Influenced by Different Anions in some Middle Euphrates Soils

Abstract

Abstract Adsorption Selenium (Se) levels in soils may be changed by a variety of variables. such as compecting anion. Investigated adsorption behavior for two top soil different properties, aiming to describe selenium adsorption in selected centrial Iraq soils. (Awfi) Samples were collected comprising clayed soil, Which Se adsorption tests were performed on the samples. After a 72-hour reaction with increasing concentrations of Se(0-400 µg mL-1) added as Na2SeO4, adsorption was measured. In the presence of Sulphate and Phosphate, which are usually applied in an inorganic form to soils. Soil properties affected adsorption capability of se, i.e. Se adsorped amount were higher for Awfi soils. The adsorption of Se on soils increased as the amount of Se supplied increased, both in the presence and absence of cometic anions. Se adsorption followed Langmuir’s and Freundlich’s equations. There are no competing anions in the absence of any, adsorption maxima of Se 87.719 μg g-1 The data from K and XM adequately reflected the adsorption of Se in the examined soils. This was ascribed to the existence of higher concentrations of competing anions, particularly sulphate and phosphate.