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zMM-- <br /> , <br /> DIM <br /> Compound's concentration In the vapor phase to its concentration <br /> in the aq"COU3 Phase. The higher Z compound's Renry'a Law con- <br /> atanto the greattr its tendency to volatilize fro- water into <br /> air, <br /> Figure A-1 graphically illustrates t11Q vapor pressure, aqueous <br /> solubility, and Henry0a Law Constants, and their relationships, <br /> for selected hydrocarhon3 typically found in gasoline. The <br /> Henry's Low consta:lt is OPPrOAmated here as ,the ratio Of vapor <br /> Pressure to solubility. <br /> The flenry*a Law constant is directly related to the tendency of <br /> compounas to volatilize, 63 Opposed to solubilizing. Compounds <br /> with Henry's Law Constants greeter than 0.001 (atm, M3 <br /> volatilize from water into *ir very rapidly /mole) <br /> (Lyman et al. .1902); <br /> those with Henry's law constants greater thaii 0,01 (atm, m3 <br /> /mole) <br /> are generally volatilized to rapidly that they are seldom found <br /> In gasoline-cont5minated ground water. It may be observed <br /> (Figure A-1) that tetraethyl lead (TEL) has an extremely low <br /> solubility and a relatively low vapor pressure. As a result, <br /> this constituent would not be expected to aOlubilize and migrate <br /> in ground water, and although Its law vapor pressure would <br /> indicate Blow volatilization, its Henry's Law constant Indicates <br /> that It may ba more rapidly volatilized than sOlubilized. The <br /> fate of TEL would be expected to be long-term binding to the <br /> soil. <br /> On the basis of these properties it can be seen that associated <br /> with any ground w&ter, soil, or free-product contamination <br /> is <br /> vapor phase contaninatior. The $VCA technique takes advantage of <br /> thiio and through the collection andanAly3j3_0f <br /> . ....... __SOij_VaPQ <br /> Permits A rapid, cost-effective: delineation of the extent of <br /> contamination. <br /> CHV82A.apa <br /> 3. <br />