Study of Pollution by Some Heavy Metals in the Water of the Tigris River in Some Areas of Salah Al-Din Governorate

One - year study was designed in Salah al-Din Governorate from June 2022 to the end of May 2023 to evaluate the concentration of some heavy elements (lead, zinc, copper and cadmium) in the water of the Tigris River.  Six sites were selectedin the governorate under study, taking into account the locations close to the sources of pollution with heavy metals and the direct effects of population centers, which are: Al-Boujwari village, Al-Hajjaj village, Wadi Sheshin area, Al-Balaj, Al-Alam district and Al-Mahzam area. Water samples were taken three times for each site during the four seasons of the year. The results of the study showed that the concentrations of heavy metals varied temporally and spatially, as the values ​​of lead, zinc, copper and cadmium ranged between 0.62- 0.04, 0.52- 0.02, 0.88- 0.26, and 0.03- 0.005mg/ L, respectively, in the water of the study sites. Compared to the other elements, an increase in the overall rate of lead concentrations was observed. Notably, an increase was detected in most concentrations of heavy metals during summer.