الملخص

Abstract The aim of this Study is to measure the concentration of Lead ,Cadmium , Zinc and Copper in the Blood of Biaji Thermal Power Station Workers . Blood samples were collected from ( 148 ) workers of this Station then divided to three groups according to the site of work ,the workers also divided to four groups according the exposure periods : ( 5 ) , (10 ) ,( 15 ) and ( 20 ) Years . TheResults showed a significant increase in the concentration of Lead , Cadmium , Zinc for the exposed workers through all exposure periods in all groups compensation with control group , while , the concentration of Copper were decreased through exposure periods in workers group in departments of Mechanical maintainance and chemical tretment department , However , we have not detectes any diffrente between Irregular group and control group during the period of exposing ( 5 ) , (10 ) years , while the proportion of Copper has been decreased in this group with in ( 15 ) years of exposing period .