Abstract

Khairia Mohamed Ahmed Al-Qahtani

DOI : http://dx.doi.org/10.13005/ojc/330414

Water pollution caused bytoxicelements is one of the most important environmental problems in the world.Heavy metals are toxic to human and dangerous for the environment. The objectives of this study were: the effects ofchelating agentson heavy metals extraction from polluted water were carried out to examine.In different concentrations : 0.01, 0.05, 0.1 mg/l ofChelating agents: Ethylenediamine tetra acetate (EDTA), oxalic acid (OA)  and citric acid (CA) were tested respectively .The effects of operating parameters, such as pH and extraction time were examined.  The results showed that the extraction ability for mercury and copper from the polluted water decreased as follows: OA > CA > EDTA. Removal of metals was dependent on the concentration of extracting agent and raised with increasing concentration of chelating agents. the rate of metals removal were very rapid during first 50 min, and the removal decreased when the pH value  of the solution increasing.

Heavy metal; chelating agent; EDTA; contaminated water

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