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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