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I <br /> RISKPRO'S SESOIL for Windows User's Guide <br />' The concentration in the soil air is calculated via the modified Henry's law: <br /> C cH= (7) <br /> R(T+273) <br /> where. <br />' <br /> cm = pollutant concentration in soil air (µg/mL) <br /> C = pollutant concentration in soil water (µg/mL) <br /> H = Henry's law constant (m3 atm/mol) <br />' R = gas constant [8.2*105 m3atm/(mol °K)] <br /> T = soil temperature (°C) <br /> The concentration adsorbed to the soil is calculated using the Freundlich isotherm (note that a <br /> cation exchange option, discussed later, is available in SESOIL). <br /> t <br /> S = Kdc" (S) <br /> where: <br /> s = pollutant adsorbed concentration (µg/g) <br /> Kd = pollutant partitioning coefficient (µg/g)/(µg/mL) <br /> rc = pollutant concentration in soil water (µg/mL) <br /> n = Freundlich exponent <br /> The total concentration of the pollutant in the soil is computed as- <br /> Co = fa * Csa + 6 ' C + PbS (g) <br /> Iwhere: <br /> co = overall (total) pollutant concentration (µg/cm3) <br /> I fa = f - B= the air-filled porosity (mL/mL) <br /> f = soil porosity (mL/mL) <br /> 9 = soil water content (mL/mL) <br /> Pb = soil bulk density (g/cm) <br /> IPage 19 <br />