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The current study was performed to get the knowledge of seasonal and Reginal changes in concentration of some trace elements (Zn, Pb, Ni and Co) in sediment, water and aquatic plant (Ceratophyllum demersum) in the Euphrates River at Suq - Alshuyoukh district, south of Iraq. The study was include some of the chemical and physical properaties for water (air and water temperature, turbidity, electrical conductivity, salinity, dissolved oxygen, biochemical oxygen dimand, pH, nitrate, phosphat also total organic carbon and sediment texture). The samples were collected from the river on seasonaly from Autumn 2015 to summer 2016. There are three stations were selected for the study, the first station was near by the tourist Alfadhliyah bridge, afertile farmland on both sides of the river. The second station was in Suq_Alshuyokh, it's away from the first station about 15 km, it's a center of boats which used for fishing, agriculture lands and homes. The third station was located in stream of ALkermashiya which lieson snuffa_marsh (apart of the Hammar marsh), It's away from the second station about 11 km and it's near by villages and fertile farmland. The results of study showed that air temperature was ranged between (15.8- 49.5)° C and water temperature was ranged between (13.8 - 48.7) °C . The highest temperature recorded in the third location during Summer. Turbidity concentrations ranged between (5.7-15.6) NTU. The electrical conductivity are ranging between (3920-8336) Ms/cm, and salinity of water was low (Oligohaline) ranging between (2.50 -5.33) ppt and recorded the highest concentrations in the third station. the highest value of pH was (8.9) in the second station and the lowest value was (7.3) in the first location while the Dissolved Oxygen concentrations ranged between (3.1-8.45) mg/L. The biological oxygen demand (BOD5) was ranged between (0.35-4.5) mg /L. As for concentration of nitrates was ranged from (0.02-6.33) mg/L. and phosphate ranged between (0.01-5.8) mg/L. the total organic carbon as percentage was ranged between (0.48-3.1) %.while sediment texture was mixed from sand ,silt, clay, the percentage for the mentiond compenents was,(50%,20% and 30%)in station 1,(40%,10%,50%) for station 2 and (10%, 20% and 70%) for station3 Atomic absorption spectrofotometer was used to estimate four trace elements (Zn, Pb, Co, and Ni) .The concentrations of the mentionel elements in water dissolved phase were (2.86,5.87,1.63,0.51) μg /L, while their concentrations in particulate phase were (12.48,28.21,17.74,1.08) μg /gm dry weight respectively. In sediment the concentrations averages of trace elements were (142.73, 127.70, 176. 82, 29.24) μg /gm dry weight respectively. In aquatic plant (Ceratophylum demersum) the concentrations averages of trace elements were (123.32, 117.54, 157.54, 27.90) μg /gm dry weight respectively. It concluded that the concentration of studied elements in sediment more than their concentration in water (dissolved and particulate) phase and more than their concentration in plant (Ceratophyllum demersum), also all concentrations of trace elements were in the international acceptable values.
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