Assessment of Cadmium and Copper Adsorption by Two Agricultural Soils from Romania and Tunisia: Risk of Water Resource Pollution

Using treated wastewater for irrigation is a good solution conserving water, but it also in part responsible groundwater and water surface pollution by heavy metals, especially copper cadmium. The soil can be barrier to retaining these pollutants protecting the resource. This study presents an assessment of adsorption cadmium two agricultural soils from Tunisia Romania evaluate risk pollution. At first, were characterized with scanning electron microscope different physico-chemical analyses. Before adsorption, elemental analysis performed SEM showed very low amount both (0.01%). Tunisian was considered clayey soil, Romanian sandy soil. All experimental kinetics isotherms well correlated (R2 > 0.9) pseudo-first-order kinetic model modified extended Redlich–Peterson binary model. For initial concentration 0.1 mmol·L?1, amounts retained percentage indicate that (qCu = 0.87 ?mol·g?1; % Cu 98%; qCd 0.88 ?mol·L?1; Cd 99%) better than 0.65 ?mol·g?1, %Cu 83%; 0.73 %Cd 93%). Copper greatest resource pollution, Tunisia. confirmed estimated retention mechanisms metals are mainly related phosphorus, chloride, sulfur carbon complexation precipitation reactions.