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4. R�INN q e Product or be adsorbed to the solid matrix and remain relatively ' immobile. Dissolved compounds will tend to volatilize from the a .phase, The Henry's Law constant is the a queous compound's concentration in the vapor Phase tsmconcratentration of a in the aqueous phase, The hi entration tendency a compound's Henry's yaw con- stant, the greater its air. y to volatilize from water into Figure 3 graphically illustrates solubilit the vapor pressure, a y, and Henry's Law constants, and queous their relationships, for selected hydrocarbons tYPicall found Henry's Law constant is y in gasoline, The approximated here as the ratio of vapor pressure to solubility. t The Henry's Law constant is directly compounds to volatilize, as o related to the tendency of ` with Henr PPosed to solubilizing. Compounds y's Law constants 5 greater than 0.00 (atm' m3 volatilize from water into air vex /mole) those with Henr ' Y rapidly (Lyman et aZ, i Henryo, Law constants 1982); are generally greater than 0.01 (atm' m3/mole) volatilized so rapidly that the in gasoline . (Figure 3) that ground water. y are seldom found. k it, ma be observed . at .tetraethyl leadTEL ( ) has an extremely low Solubility and are latively low vapor pressure, As a result, this constituent would not be ex j expected to solubilize and migrate in ground water, and although its low vapor } P pressure would indicate slow volatilization, its Henr that it ma Y's Law constant indicates y be more rapidly volatilized than so b fiats of TEL would.be_.expected-to b�' long-term binding __.. The.. �• soil. g to the On the basis of the Properties it can be seen that associated with any ground water, Y , soil, or free-product contamination is z vapor phase contamination Thc' SVCA` ` technique takes advantage of this,t s, and through the collection and analysis of soil v �. �.J apor EXXON9:84L .; 5 n— Iwo ON is IM