The EF values for Co in Euphrates River sediments were from 20.88 at S8 and 90.60 at S9, Table 8. Most sampling sites have EF for Co more than 20 and less than 40, while S7 and S9 more than 40. According to Mmolawa et al. [12], Euphrates sediments at sampling sites are classified as very high to extremely high enrichment for Co.