Medical geochemistry of Major Elements in the Karun-Arvand Rivers: Possible Consequences on Persian Gulf Ecosystems

In order to study of karun-arvand geochemistry and investigation of probably anomalies especially in Persian Gulf, distribution of physicochemical factors, major elements and some of anion in 33 collected sample with used titration and flame photometer method has been determined. Attended data showed that lowest and highest frequency of T.D.S and Total Hardness in Ize-Baghmalek (355/66 and 239 ppm) and Abadan (2867/5 and 825 ppm), respectively. PH not showed significant change in entire river length. The mean annual frequencies of elements are: Cl=507.92 > Na=324.72 > S=323.3 > Ca=122.86 > K=3.75. Investigation of environmental factors confirms that climate condition and geology, especially in central and southern areas have the important role in increasing T.D.S, Total Hardness, Na, Ca and S. Human activities, especially the sewage of soap production factory can be most important effective factor in increasing Chloride concentration in Khoramshahr-Abadan section. The high correlation coefficient (>/9) of alkali elements with total hardness, shows carbonate regime of the Karun-Arvand on many sections. Probably, it arises from the of lime-evaporation bed of river. Despite the high affinity alkali elements such as Na and K to P, correlation coefficient between Na and K with P2O5 was -0/51 and -0/47, respectively. High correlation coefficient between Na and Cl, confirms same origin for these elements. High concentration of SO4 and T.D.S in river liman can be affects growth pattern of plants and communities aquatic in this area. Also, high frequency of sodium, can be created tissue disruptions in some fish species especially in west coastlines. Finally, high frequency of calcium, increases native plants resistance against celimate anomalies.