الفهرس 
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Abstract
Heavy metals produced and released during agricultural and industrial activities cause the pollution in the environment. Sediments play an important role as natural adsorbants to immobilize heavy metals contaminates. This study investigates the effectiveness of some Egyptian sediment such as (phosphate rock, iron oxide and shale) for remediation of some heavy metals Cd, Zn, Fe, Pb and Cr from wastewater sample collected from iron and steel factory. Three heavy metals solutions (Cd, Pb, Zn) have been prepared. These solutions are used to prepare new mixed solutions of the three metals at different concentrations from 0.05 to 1 mM used for calibration.The sediment samples were firstly examined using IR. Also, the major heavy metals were analyzed by ICP technique and the amount of metals absorbed into the sediments have been evaluated using Laser Induced Breakdown Spectroscopy technique (LIBS). This spectroscopic technique is very useful for determining the elemental composition of different materials qualitatively and quantitatively. The concentrations of heavy metals in the solutions before and after treatments with sediments have been followed up at different times and different concentrations. The obtained results have been compared with the analytical results of the Inductively Coupled Plasma (ICP) as well as wet chemistry. The choice of the proper kind of the sediment to be used for elemental pollution removal depends on the results obtained in our study. It has been found that the phosphate rock (PR) was highly sensitive for retaining Pb and Cr and has weak sensitivity for retaining Zn and Fe if these ions are found in wastewater or any solution. In all cases, obtained results confirmed the strong relationship between phosphate rock (PR) sediment and Pb elimination from wastewater. The efficiency of shale clay to remove Cr, Zn and Fe is found to be higher than phosphate rock and iron oxide .There were a good agreement between the results obtained by ICP and LIBS techniques. This shows that LIBS can be used as a reliable technique to follow up in situ the presence of heavy metals during the remediation processes.