# EPA On-line Tools for Site Assessment Calculation

When chemicals are released into the environment from a mixture like a petroleum hydrocarbon fuel, the water solubilities of the chemicals are typically far lower than their published solubilities. For example, the solubility of benzene is around 1750 mg/L, but typical maximum benzene concentrations resulting from equilibrium between gasoline and water are only 20 - 40 mg/L. This occurs because the concentration (or effective solubility) depends on the abundance of the chemical in the fuel.

 Experimental, temperature-dependent version of the calculator.

 The effective solubility calculator only calculates the partitioning between water and a fuel. Use the mass distribution calculator to determine the partitioning (concentrations) between water, air, fuel and solids in the subsurface.

 Effective Solubility Calculator
 Effective Solubility Cw = xo S Cw = Effective solubility xo = mole fraction (of chemical in fuel) S = solubility Mole Fraction xo = MFx MWo / MWx MFx = mass fraction of selected chemical in fuel MWo = average molecular weight of fuel est. 105 g/mole for gasoline est. 165 g/mole for Jet fuel est. 230 g/mole for diesel fuel MWX = molecular weight of selected chemical

Site Name
Date
Chemical
Solubility (S) mg/L
Optional Revised Solubility (S) mg/L
Example Fuel
Average Molecular Weight of Fuel (MWo)
Percent Mass Fraction
Effective Solubility (Cw) mg/L
Fuel composition note:
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