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en t�z <br /> '13EN'T 2 <br /> Hydrocarbons not ro-raining in the fire proiltic:t will partition <br /> Into either ground water or noij vapor and mi9rite L.j 1.jjj� re,,1tjjL <br /> of a variety of Intc-racting forces. rn around wntor, conto-ni- <br /> nantu will migrate with the ground-water flow, interOCLIng with <br /> the rack or aoi.1 geological medium. An the contamin6nta p,,:;r, <br /> through a modium, organic conatitutnts in the ntdium Interaat <br /> with the contattdn�jntg, and no", are adsorbed Or bound to particle <br /> iurfacca (13ruell and Ifoaq 1986) . The result in n net rutardation <br /> in the velocity Of mOv"ent of those COC.Voundz relative to that <br /> of the ground water In which they are diDoolved. The process Is <br /> On*1090uz to laboratory chromatography. The compound with the <br /> least affinity for the porous tradium, 10 leant retarded and there- <br /> fore moves most rapidly. This compound, then, Is present at thv <br /> leading -dd9e of a contaminant plur <br /> n. <br /> The affinity of a compound for the coil po:oua medium I-q partly a <br /> function Of Cie cor-pound'a hydrophobicity--that in, the more <br /> hydrophobic a Compound the more likely it 10 to adsorb to the <br /> solid rmedium. Aqueous solubility IS 0 good indicator of hydro- <br /> phobicity: the more Soluble a Compound is, the less hydrophobic <br /> and more hydrophilic it is, and Vice versa. <br /> Vapor pressure is a <br /> good indicator of volatility; Compounds with higher vapor <br /> pressurts are more volati,c. <br /> In determining the environmental fate Of various hydrocarbon <br /> Colq4unds in a hydrocarbon mixture such as gasoline, those which <br /> have a high vapor pressure are more likely to move Into the vapor <br /> phase, or evaporate. ConTound3 with high solubility are more <br /> likely to move into ground water from the free product and, once <br /> In ground wa'.ar, tend to move rsore rapidly. Compounds of low <br /> vapor pressure and low solubility tend to remain in the free <br /> Product or be adsorbed to the Solid matrix and remain -elatively <br /> i�abi le. <br /> Oia3olved co=pounds wi.11 tend to volatilize from the aqueous <br /> Phase. The Renrya Law constant is the equilibrium, ratio of a <br /> C-RV8 2A.ape <br /> 2 <br />