Determination of appropriate method for stimating of MTBE sorption by the soil of Tehran oil refinery (Ray city)

ethyl Tertiary-Butyl Ether (MTBE) is one of the gas dditives that can be effective in increasing the octan ating of fuel. EPA (Environmental Protection Agency) as labeled MTBE in carcinogen compounds. This ompound can leak into the soil from underground fuel anks and its chemical and physical properties affords apid influence. orption ability of soil, is so effective in influence of TBE into the soil and "distribution Coefficient (Kd)" an show this ability. Kd is one of the important ffectives that recently lionizes in Environmental eotechnics and its range is so wide in as much as t can be "0" or "1000" and more; This wide range is mportant in using numerical models for underground ater and contaminant trasformation modeling. n this stusy the real value of sorption has been etermined by several sorption tests on MTBE and he soil of Ray city and according this value, various sotherm models was studied to finding the most ccurate model for MTBE and this soil. n this study, all of the tests has done according to STM standards. inally it’s concluded that all of studied models are ppropriate for calculating Kd but in similar cases,we can offer foloing models sequently: Dubinin- adushkevich Model; Langmuir Model; Freundlich odel; Linear Model.