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Table 5: Equations Used to Estimate Volatilization and Particulate Emission Factors <br />Volatilization and Particulate Emission Factors <br />Effective Diffusion Coefficient (D eft ) <br /> <br />(0 1a/3\ <br />a 2 Dwater <br />" <br />n 2 <br />uT <br />Deff = Dair <br />Volatilization Factor (VF) <br />Infinite source: <br />2• W • Pb <br />U air 6air <br />D eff • H x /0 3 cm3kg <br />7-48 „, + FOC • K oc • ko, + H • 8a )tau m 3 g <br />_air) (mg <br />rn3 <br />(mg / kg — <br />Mass-balance considered: <br />V F <br />[ <br />(mg / m 3 —air) <br />(mg / kg — soil) <br />W • • d <br /> x10 <br />3 crn3 kg <br />1.1,r • 8 • tau m 3g <br />Calculate VF using both equations, then use the lower of the two values. <br />VF, : Use tau = tau t + tau, <br />Use tau = <br />VF ut : Use tau = tauut <br />18