The contamination factor (CF) values for Mn in Euphrates sediments varied from 0.181 at S9 to 0.416 at S5,Table 9. At all sampling sites, the CF values were less than 1. According to [31], Euphrates sediments at all sampling sites were low contaminated. The Igeo values for Mn at all sampling sites were negative. According to Muller’s classification, Euphrates sediments are unpolluted by Mn.