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r""5 <br /> �k ��ri "�k° k' '�a C _,a.•.>.x� w.' - �§Y:na- � `x 5 <br /> ` �� `,3*� <br /> i <br /> compound'a concentration in the vapor phase_ to its Concentration <br /> In the aqueous phase. The higher a compound's flenry`a Law con- <br /> Otant, the greater its tendency to volatilize from water into <br /> air. <br /> Figura A-1 graphically illustrhtca the vapor pressure, aqueous <br /> solubility, and Henry's Law constants, and their relationships, <br /> for selected hydrocarbonu typically found in gasoline. The <br /> Henry's Law constant is approximated here as the ratio of vapor <br /> pressure to solubility. <br /> The Henry's Lau constant is directly related to the tendency of <br /> compounds to volatilize, as oppoacd to aolubilizing. Compounds <br /> with Henry'a Law constants greater than 0.001. (atm' m3leaole) <br /> volatilize from water into air very rapidly (Lyman et al. 1982) ; <br /> those with Henry's Law constants greater than 0.01 (atm' m3fnolc) <br /> are generally volatilized so rapidly that they area seldom found <br /> e-_ in gasoline-contaminated ground water. Ik may be observed <br /> (Figure A-1) that tetraethyl. lead (TEL) hats an extremely low <br /> solubility and a relatively low vapor pressure. As a result, <br /> this constituent would not be expected to solubilize and migrate <br /> in ground water, and although its low vapor pressure would <br /> Indicate slow volatilization, its Henry's Latif constant indicates <br /> that it may lee more rapidly volatilized than solubilized. The <br /> fate of TEL would be expected to be long-terra binding to the; <br /> soil. <br /> Can the basis of these properties it can be seen that associated <br /> with any ground water, soil, or free-product contamination in <br /> vapor phase contamination. The $'1C.A technique takes advantage of <br /> this, and through the collection and Analysis of soil vapor <br /> permits a rapid, cost-effective delineation of the extent of <br /> t <br /> } CHV82A.ape <br />