الفهرس 
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Abstract
In the present study, silica nanoparticles modified with folic acid (NS-FA) were synthesized and characterized using some instrumental techniques such as elemental analysis, scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and FTIR. The modified silica nanoparticles were employed for removal of Cd2+, Cr3+, Al3+ and Fe3+ from blood and water samples by two different separation techniques are solid-phase extraction method and sorptive-flotation technique ,and effect of some important parameters such as (pH, temperature, initial concentration, time, other ions and adesorption)