Studying of some heavy metals levels in water samples from Kirkuk Irrigation project of Tuz Khurmatu District, Iraq

The current study is conducted to estimate four heavy metals which are copper (Cu), lead (Pb), cadmium (Cd) and zinc (Zn) in the Kirkuk irrigation project which flows through Tuz Khurmatu district. The study samples are collected from the project water at a rate of one sample per month from November 2019 to August 2020 from three sites in Tuz Khurmatu district of Salah Al-Din Governorate. The first site is located before the project enters the district, and the second site is located within the boundaries of the district which is the meeting of the project with the Aqsu River and the site of dumping waste water in Tuz Khurmatu district. The third site is located outside the district. Generally, the results of the study show that the lead and cadmium metals are more concentrated than copper and zinc, the highest concentration of copper is 0.27 mg / L in the second site in March, and the lowest concentration is 0.008 mg / L in the first site in August. As for lead, the highest concentration is 0.21 mg / L in the second site in the month of March and the lowest concentration is 0.026 mg / L in the first site in the month of December. For cadmium, the highest concentration is 0.047 mg / L in the second site in June, and the lowest concentration is 0.001 mg / L in the first site in the month of December. The highest concentration for zinc is 0.098 mg / L in the second site in the month of March, and the lowest concentration is 0.022 mg / L in the third site in July. The results also show that there are great differences in varying seasons and locations