Abstract

Sediment samples were taken from six location in Tigris, Euphrates and Shatt AI-Arab River during 2021- 2022, sample were extracted to determine the heavy metals (Cd, Cu, Fe, Pb, Mn, Ni and Zn) in Residual sediment of these samples by using the inductively coupled plasma atomic emission spectrometer (ICP). The analysis was also determined percentage of total organic carbon and grain size. The results of the concentrations in the Residual phase as follows (Fe> Mn> Cu > Pb> Zn> Ni >Cd) was (811.71, 90.49, 72.47, 67.34, 64.44, 38.52,25.54) dry weight. The results showed that the concentrations of the Metals were high, except for nickel and cadmium, which were relatively few, as for of total organic carbon concentrations high value (TOC %) It was (7.2 µg/g) at the six station during winter while the lowest value was (2.0µg/g) at the first station during summer. The grain size analysis was mainly silt and clay are the most predominate in the study area. Geo Accumulation Index (I-geo) for heavy elements in the sediments was also determined, and it showed that the yearly rate of the concentrations of the metals varied between the lowest value (-6.895) of Iron and the maximum value (6.826) for cadmium. Additionally, it was determined the enrichment coefficient (EF) for the heavy elements in the sediments, where the annual rate of the metals ranged between the lowest value (3.26) for manganese and the highest value (10488.14) for cadmium, and was accounted the Contamination factor (CF)for the heavy metals in the sediments, where the annual average of the metals ranged between the lowest value (0.012) for Iron and the highest value (170.26) for cadmium. These results showed that organic matter pollution was mainly from direct discharge of domestic wastewater into Tigris, Euphrates, and Shatt al-Arab river.

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