التحري عن التلوث المعدني والجرثومي في مياه ورواسب هور ابي زرك جنوب العراق

Abstract

The study was carry out from March 2009 to Auguest 2010, In three stations on Abu-Zariq Marsh at Al-Nassiriyah city southeren of Iraq, This study was conducted to determine the concentration of five trace elements (Cd, Cu, Ni ,Pb and Zn) in water (as dissolved and particulate matter) and sediments In addition to enumeration the counts of bacterial indicators: Total coliform (Tc), Fecal colifirm (Fc), Fecal enterococci (Fe). Also determine the amount of Total organic carbon in sediments (TOC%). Flame atomic absorpiton spectrophotometry was used throughout the study,The annul mean concentration of trace elements(Cd, Cu, Ni, Pb and Zn) in dissolved phase of water were (0.21, 0.52, 1.71, 1.61 and 5.42) µg/L. respectively, whereas their concentrations in particulate phase were (4.05, 17.39, 10.11, 20.37 and 33.38)µg/g dry weight respectively. Annual mean concentration of these metals in sediments were (2.99, 20.07, 35.32, 73,76, 32.24)µg/g dry weight respectively. Zinc recorded the highest level in the dissolved and particulate phase of water, whereas lead had the highest level in the sediments. The resulte appeared higest of level contamination in second station during Winter and Autum and lowest level in therd station , Total coliform ranged between 1700 and 5400 cell/100ml, Fecal coliform ranged between 1500 and 4500 cell/100ml and Fecal enterococci ranged between 4000 and 15000cell/100 ml.Total organic carbon in sediment was recorded 1.9% in the second station during Spring, whereas lowest range was 0.72% in the first station during Autumn. Values of air temperatures range between (18-48)˚C. water temperature between (12-33)˚C, highest range of pH 8.62 in second station during the Autumn, whereas lowest range 7.12 in the thired station during the Summer, Salinity recorded highest range 2.75 ppt in the second station during the Winter, whereas lowest range was 0.65 ppt in the third station during Summer, Dissolved Oxygen was 8.76 ppm in the first station during Winter, whereas lowest range was 6.77 ppm in the second station during summer. Biological Oxygen Demand was recorded 5.33 ppm in the second station during Winter, and the lowest range was 3 ppm in the thied station during summer