Methyl Tertiary-Butyl Ether (MTBE) is one of the gas additives that can be more effective in increasing the octan rating of fuel. EPA (Environmental Protection Agency) has labeled MTBE in carcinogen compounds.This compound can leak into the soil from  More
Methyl Tertiary-Butyl Ether (MTBE) is one of the gas additives that can be more effective in increasing the octan rating of fuel. EPA (Environmental Protection Agency) has labeled MTBE in carcinogen compounds.This compound can leak into the soil from underground fuel tanks and its chemical and physical properties affords rapid influence.Sorption ability of soil, is so effective in influence of MTBE into the soil and “distribution Coefficient (Kd)” can show this ability. Kd is one of the important effectives that recently lionizes in Environmental Geotechnics and its range is so wide in as much as it can be “0” or “1000” and more; This wide range is important in using numerical models for underground water and contaminant trasformation modeling.In this study, the real value of sorption has been determined by several sorption tests on MTBE and the soil of Ray city and according this value, various isotherm models were studied to find the most accurate model for MTBE and this soil.In this study, all of the tests have done according to ASTM standards.
Finally, it’s concluded that all of studied models are appropriate for calculating Kd but in similar cases, we can offer foloing models sequently: Dubinin-Radushkevich Model; Langmuir Model; Freundlich Model; Linear Model.
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Methyl Tertiary-Butyl Ether (MTBE) is one of the gas additives that can be effective in increasing the octan rating of fuel. EPA (Environmental Protection Agency) has labeled MTBE in carcinogen compounds. This compound can leak into the soil from underground fuel tanks More
Methyl Tertiary-Butyl Ether (MTBE) is one of the gas additives that can be effective in increasing the octan rating of fuel. EPA (Environmental Protection Agency) has labeled MTBE in carcinogen compounds. This compound can leak into the soil from underground fuel tanks and its chemical and physical properties affords rapid influence.
Sorption ability of soil, is so effective in influence of MTBE into the soil and "distribution Coefficient (Kd)" can show this ability. Kd is one of the important effectives that recently lionizes in Environmental Geotechnics and its range is so wide in as much as it can be "0" or "1000" and more; This wide range is important in using numerical models for underground water and contaminant trasformation modeling.
In this stusy the real value of sorption has been determined by several sorption tests on MTBE and the soil of Ray city and according this value, various isotherm models was studied to finding the most accurate model for MTBE and this soil.
In this study, all of the tests has done according to ASTM standards.
Finally it's concluded that all of studied models are appropriate for calculating Kd but in similar cases, we can offer foloing models sequently: Dubinin-Radushkevich Model; Langmuir Model; Freundlich Model; Linear Model.
)Mgn� S 0�O cm;margin-bottom:.0001pt;text-align:justify;mso-pagination: none;direction:rtl;unicode-bidi:embed'>در پایان مشاهده شد که هر چهار روش بررسیشده، برای تعیین ضریب جذب قابل استفادهاند؛ امّا در شرایط مشابه، میتوان به ترتیب، روشهای دوبینین-رادوشکویچ، لانگمایر، فرندلیخ و در نهایت ایزوترم خطّی را برای تخمین Kd و فرآیند جذب، پیشنهاد کرد.
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One of the important effectives that recently lionizes in Environmental Geotechnics, is"distribution Coefficient (Kd)". The range of this parameter is very wide, ranging as much as "0" to"1000" and more. This wide range is important in using numerical models for undergr More
One of the important effectives that recently lionizes in Environmental Geotechnics, is"distribution Coefficient (Kd)". The range of this parameter is very wide, ranging as much as "0" to"1000" and more. This wide range is important in using numerical models for underground water andcontaminant transformation modeling. MODFLOW is one of the appropriate models in undergroundwater and contaminant transformation modeling.It is very important to understand the sensitivity of this model towards Kd and the effects ofselected method in modeling given the necessity of this model to distribution Coefficient and itsability about calculation of Kd in 3 methods.This research has been performed for the soil of Rey zone with MTBE and all of the tests have beenperformed according to ASTM standards.Finally it is concluded that the sensitivity of MODFLOW toward value of Kd and itscalculation method is inconsiderable and the model is most appropriate when Kd is not known.
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