REHAB SALIM KHAZAAL AL-ATBEE's scientific contributions

The content of heavy elements Copper (Cu), Zinc (Zn) and Iron (Fe) were studied in towsubmerged plants species (Najas marina L and Ceratophyllum demarsum) collected seasonally for periods summer 2019 to spring 2020at two site selected along Al-Chibayish Marsh southern of Iraq to determine the ability of these species to accumulate elements from surrounding water and sediment. The result showed that the average concentration of elements in water for the Particulate phase higher than in the dissolved phase. Also, mean concentrations of particulate phase higher than their mean concentration in total sediments samples except for Fe concentration which was in sediments samples was higher than in particulate part of water. The uptake of totalelements by two studied aquatic plants showed that the highest uptake of elements by the C.demersum spices excepted Fe which higher concentration in N.marina. Also, Bioconcentration factor (BCF) for different elements were calculated and according to these factor data, the orderof heavy elements accumulation in two species were Fe > Zn> Cu.

The present study concerned with the heavy elements (Cd, Cr, Ni and Pb) concentration that accumulated in dominant species of aquatic plants (submerged; Ceratophyllum demersum) and (merged; Phragmites australis, Typha domingensis and Schoenoplectus littoralis), in relation to the concentration of these elements in each of the dissolved phase of water and sediments samples which collected seasonally from four sites at Al-Chibayish marshes during August 2017 to April 2018. Also Bioaccumulation factor (BAF) was calculated. The results showed that the highest concentrations of heavy elements was in the sediments, then the aquatic plants and the lowest concentrations was recorded in dissolved phase, whereas the Bioaccumulation Factor (BAF) of heavy elements in aquatic plants, shows that Ceratophyllum demersum have the highest concentration than the other species.