F. J. M. Al-Imarah et al. Toxic Environmental… 253 Toxic Environmental Parameters in Water Samples from some aquatic wetlands southern Iraq. F. J. M. Al-Imarah 1 , A.S. Abdul Hussain 2 and Q. M. Al-Salman Al-Mayahy 3 1- Dept. Marine Chem. &Environ. Poll, Marine Science Centre, Basrah Univ., 2- Basrah Agriculture Administration, Ministry of Agriculture 3- Coalition of the Scientists & Intellectuals for Man and Environmt Basrah- Iraq Abstract: In this study, estimation has done for some toxic elements; Phosphorus(P), Arsenic(As), Cadmium (Cd), Mercury(Hg) and Lead(Pb), as well as pH, conductivity(EC), Total Dissolved Solids (TDS) and Chloride (Cl-) in the waters of 4 sites in Shatt Al-Arab River(1- Ashar, 2-Sehan, 3-Seebah and 4-Fao), in addition to another three sites, 5- Al-Hewaizah Marsh, 6- Water supply for fish lake and 7- Tigris River. All of these sites represent sources for multi uses waters. High value of total phosphorous 0.4 mg/l was recorded in Fao station 4 and 0.5 mg/l in Al-Hewaizah marsh station 5, Mercury ranged between 0.003 mg/l in station 7 and 0.0062 mg/l in station 6. For Arsenic lower value was recorded as 0.002 mg/l in station 7, and higher values as 0.52 mg/l in station 3. For cadmium values recorded were in the same trend as Arsenic, lower values as 0.00003 mg/l in station 5 and higher value as 0.007 mg/l in station 4, while levels of Lead were alternative with lower value of 0.006 mg/l in station 3 , and as higher as 0.0216 mg/l in station 7. pH values reported ranged between 7.52 and 7.88 in stations 5 and 6 respectively. Conductivity and TDS as well as chloride were coincide as higher values recorded in the water of Shatt Al-Arab river, stations 1-4 (11860 – 47700 μS/cm, 11500 – 40300 mg/l and 5690 – 31670 mg/l) respectively due to the effect of water from Arabian Gulf during high tide as well as station 6 ( 30900 μS/cm, 27250 mg/l and 17900 mg/l) respectively and lower values in ( 575 μS/cm, 390 mg/l and 97 mg/l) respectively in station 7. Taking in consideration that the permissible levels set by WHO and USEPA for major parameters within this study are 0.06 – 0.12 mg/l for phosphorous, 0.00001 mg/l for arsenic, 0.00025 – 0.002 mg/l for cadmium, 0.00077 – 0.0014 mg/l for mercury and 0.05 mg/l for lead. 1-Introduction : Nearly 3 million people from southern Iraq supply their water for different uses from Shatt Al-Arab River and Southern marshes. These waters are characterized by tens of environmental parameters, trace elements( As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Zn, etc), physical(pH, conductivity, salinity etc) and Chemical (dissolved oxygen, carbonates, bicarbonates, silicates, calcium, magnesium, floride…etc). Some of the'se parameters such as trace elements Cr, Cu, Ni Zn are essential