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_r .r"?ar .'v...r', x"'€ xs ".a. a- _- -- .�ss ."'�,Y "� ,�. x e .sr'a s' s.: am' <br /> �,r. <br />µw. <br /> Hydrocarbons not remaining in the tree product, will partition <br /> Into either ground water or noil vapor and migrate as the rQatult. <br /> of a variety of interacting forcas. In ground water, contami- <br /> nants will migrate- with the ground-water flow, interacting with <br /> the rock Or 0041 gcoiogical medium. Aa the contaminants paha <br /> through a ilium, organic coAstituent0 In the mtdiurn interact <br /> with the contaminantsa, and atts--se are adsorbed or bound to particle <br /> surfaces (flrueall And Noag 1386) . Tho result is a net retardation <br /> In the velocity of rovennent of those co:.ounds relative to that <br /> Of the ground gaster in whish they are dissolved. The process in <br /> analogous to laboratory chrot-atograpbl. The compound with the <br /> ream affinity for the porous medius in least retarded and there- <br /> fore moves most rapidly. This corpound, then, Is prO06nt at the <br /> leading edge of a contaminant plume. <br /> The rffinity of a coopound for the Boil poroun mediums is partly a <br /> function of the compound's hydrophobicity--that in, the more <br /> hydrophobic A Compound the more likely it is to adsorb to the <br /> solid medium. 'Aqueous solubility is a good indicator of hydro- <br /> phobicity: the more soluble a compound is, Me less hydrophobic <br /> and more hydrophilic it in, And vice versa. Vapor preaaure is a <br /> gonad Indicator of volatility; compounds with higher vapor <br /> pressures are =re volatile. <br /> In detterrAning the environmental fate of various hydrocArbon <br /> compounds in a hydrocarbon mixture ouch Ps gasoline, those which <br /> have a high vapor pressure are more likely to move into tht vapor <br /> phase, or evaporate. Cozpo.tnds with high solubility are ooro . <br /> likely to 00ve into ground water from the free product and, ones: <br /> In ground water, tend to move more rapidly. Compound=s of low <br /> vapor-praaastur -acrd -low solubility tend to rtzaln 3n thu free--- <br /> product or be adsorb-ad tO the solid matrix and t4maln relatively <br /> itsrxobile. <br /> Dissolved compounds will tend to vOlAtilizet from tht aqueous . <br /> Phase. The Henry's ,Law constoAt is the equilibrium mento of & <br /> C.i�it��lt,spa 2 <br />